~maddevelopers/mg5amcnlo/3.0.1

Update notes for MadGraph5_aMC@NLO (in reverse time order)

3.0.1 

     include up to 2.6.4

     MZ: Enable shower for QCD-only splittings

     RF: Fixed a major bug in the code that affected 3.0.0 that affected processes with

         cuts and --to a lesser extend-- processes with massive final state particles:

	 the phase-space region where "xi_i_fks != xinorm*xi_i_hat" had the wrong "prefact".

3.0.0 (01/05/18):

     RF+SF+VH+DP+HS+MZ: Allow for the computation of NLO EW corrections (and more subleading NLO corrections).

         [Note: when requiring NLO corrections ([QCD], [QED] or [QCD QED]), internally the code always treats this [QCD QED],

	 and then uses the coupling orders to specify which contributions should be considered. Among other things, this means

	 that when doing QCD corrections only --contrary to previous versions-- also loop diagrams with non-QCD-charged 

	 particles will be included (e.g., the pentagons in Higgs production via vector-boson fusion).]

     HS: inclusion of SMWidth for fast evaluation of NLO accurate widths for all SM particles

     RF+SF: Resonance-aware phase-space mapping for NLO computations 

     RF: Reduction of the number of jobs -- results in earlier detection of small integration channels for fNLO

     OM: remove ./bin/mg5 executable

2.6.4 (//)

      RF: Fixed a bug when using TopDrawer plots for f(N)LO runs, where the combination of the plots could lead

          to completely wrong histograms/distributions in case of high-precision runs.

      OM: Fix some MLM crash for some processes (in particular BSM processes with W'). 

      OM: Fix a bug in the reweighting due to the new lhe format (the one avoiding some issue with py8)

      OM: add a new command "install looptools" to trigger the question that is automatically trigger 

          the first time a loop computation is needed.

2.6.3.2 (22/06/18)

      OM: Fix a bug in auto-width when mass are below QCD scale.

      OM: Fix a bug for g b initial state where the mass in the lhe file was not always correctly assigned

          Note that the momentum was fine (i.e. in the file P^2 was not equal to the mention M but to the correct one)

      OM: Improvment for madspin in the mode spinmode=none

      OM: Fix a bug in MadSpin which was making MadSpin to work only in debug mode

2.6.3 (15/06/18)

      OM: When importing model, we now run one additional layer of optimisation:

           - if a vertex as two identical coupling for the same color structure then the associated lorentz 

             structure are merged in a single one and the vertex is modified accordingly

      OM: When restricting a model, we also run one additional layer of optimisation

           - Opposite sign coupling are now identified and merged into a single one

           - if a vertex as two identical coupling (up to the sign) for the same color structure

             then the associated lorentz structure are merged in a single one and the 

             vertex is modified accordingly 

      VH+OM: changing the ALOHA naming scheme for combine routine when the function name starts to be too long. 

      OM: adding a hidden parameter to the run_card (python_seed) to allow to control the randon number 

          generated within python and be able to have full reproducibility of the events

      OM: Fixing some issue with the default dynamical scale choice for 

            - non minimal QED sample

            - heft model when multiple radiation coming from the higgs decay/scattering

          This can also impact MLM since it use the same definition for the dynamical scale

      OM: Fix some issue for DIS scattering where the shat was wrongly defined for low energy scattering.

          Low energy scattering are not adviced since they break the factorization theorem.

          In particular the z-boost of the events are quite ill defined in that scenario.

      OM: changing the format of the param_card for NLO model to match expectation from the latest PY8

      OM: Update of MadSpin to allow special input file for the case of spinmode=none. 

          With that very simple mode of decay, you can now decay hepmc file or wrongly formatted leshouches event

          (in that mode we do not have spin correlation and width effect)

      PT: in montecarlocounter.f: improved colour-flow treatment in the case gluons are twice colour-connected to each other

          new gfunction(w) to get smoothly to 0 as w -> 1. (for NLO+PS run)

      OM: Fix some issue for the new QED model (including one in the handling of complex mass scheme of such model)

      OM: Fixing an issue of the param_card out of sync when running compute-widths

      OM: Adding Qnumbers block for ghost (the latest version of py8 was crashing due to their absence)

2.6.2 (29/04/18)

      Heavy ion pdf / pdf in general:

      -------------------------------

      OM: Support for rescaling PDF to ion PDF (assuming independent hadron), this is well suited for Lead-Lead collision, p-Lead collision and fix-target

      OM: Support in systematics.py for ion pdf. Possiblity to rescale only one beam (usefull to change only on PDF for fix target experiment)

      OM: Removing internal support for old type of PDF (only supported internal pdf are now cteq6 and nnpdf23)

      User Interface

      --------------

      OM: introduce "update to_full" command to display all the hidden parameter.

      OM: introduce "update ion_pdf" and "update beam_pol" to add related section in the run_card.

          the polarization of the beam is set as hidden parameter instead as default parameter

      OM: improve handling of (some) run_card parameter:

            - add comment that can be displayed via "help NAME"

            - add autocompletion for some parameter

            - add direct rejection of parameter edition if not in some allowed list/range

      Bug fixes:

      ----------

      OM: Fix issue with madspin introduced in 2.6.1 (failing to generate correct diagram for NLO process)

      OM: fix crash in 1>N reweighting

      RF+MZ: Fixed a problem with (f)NLO(+PS) runs in case the Born has identical QCD-charged

      	     particles. Cross sections were typically correct, but some distributions might

	     have shown an asymmetry. 

      OM: Change in LO maching for HEFT (or any model with hgg vertex) in the way to flag jet that should

          not take part in the matching/merging procedure.

      OM: Fixed a bug for loop induced in gridpack mode

      RF: Fixed a bug for ApplGrid: in rare cases the ApplGrid tables were filled twice for the same event

      OM: Fixed a bug for fixed target experiment when the energy of the beam was set to 0. 

      RF: Fixed an issue where too many files were opened for fNLO runs in rare cases

      OM: Fix issue on Madevent html output where some link where broken

      OM: Fix issue for the display lorentz function (was also presenting security issue for online use)

      OM: Fix issue for spin 3/2 (one in presence of fermion flow violation and one for custom propagator)

      Enhancement:

      -----------

      OM: add the value of all the widths in Auto-width in the scan summary file

      OM: For 1>N, if the user set fixed_run_scale to True, then the scale is choose accordingly

          and not following the mass of the inital state anymore

      RF: For the HwU histograms, if no gnuplot installation is found, write the gnuplot scripts in v5

          format (instead of the very old v4 format).

      OM: Change the default LO output directory structure. Now by default the lepton and neutrino are split 

          in two different directory. This avoids to face problem with the assymetric cut on lepton/neutrino

      OM: loop-filter commands are now working for loop-induced processes

      OM: New  method avoiding that two process are running inside the same output directory.

          This is implemented only for Gridpack and LO run so far. 

          The new method should be more robust in case of crash (i.e. not wrongly trigger as before)

      OM: For LO scan, if a crash (or ctrl-c) occurs during the scan, the original param_card is now

          restored.

2.6.1 (12/12/17)

      RF+MZ: It is now possible to add LO matrix elements (with [LOonly]) 

             to Fx-Fx merged samples. Thanks to Josh Bendavid for testing.

      OM: Re-factoring the code asking which program to use (both at LO and NLO)

          - design modular, designed for PLUGIN interactions

          - the length of the question auto adapts to the size of the shell

      OM: Allowing to have the gridpack stored on a readonly filesystem

      OM: Fix a bug in matching/merging forbiding the pdf reweighting for some processes (since 2.4.0)

      OM: Creation of online database with the name of known UFO model. If a use try to import a model

          which does not exits locally, the code will automatically check that database and download the 

          associate model if it exists. You can contact us if you are the author of one model which is not

          on our database. 

	  The list of all available model is available by typing "display model_list"

      OM: Model with __arxiv__ attribute will display "please cite XXXX.XXXXX when using this model" when

          loaded for the first time.

      OM: A fail of importing a UFO model does not try anymore to import v4 model

      OM: Many model present in models directory have been removed, however they can still be imported

          since they are available via automatic-download

      OM: Refactoring of the gridpack functionality with an infinite loop to reach the requested number of events

      OM+RF: Adding new class of cut at LO/NLO defined via the pdg of the particle

      VH: Support for the latest version of MA5

      MZ: Adding support for lhapdf v6.2

      OM: Fixing various bug in the spinmode=onshell mode of MadSpin

      OM: Fix a bug for model with 4 fermion in presence of restrict_card

      OM: Fix aloha bug in presence of complex form-factor.

      OM: improve auto-detection and handling of slha1/slha2 input file when expecting slha2. 

2.6.0 (16/08/17)

      New Functionalities:

      --------------------

      RF+OM: Added the possibility to also have a bias-function for event generation at (f)NLO(+PS)

      OM: Improve Re-WEIGHTING module

          1) creation of a single library by hyppothesis. 

          2) library for new hyppothesis can be specify via the new

             options: change tree_path and change virt_path

          3) allows to re-weight with different mass in the final states (LO only)

             This forces to rewrite a new lhe file, not adding weight inside the file

             (via the command: change output 2.0)

          4) allows to run the systematics on the newly generated file (for new output file)

             (via the command change systematics True)

          5) Fix some Nan issue for NLO reweighting in presence of colinear emission

	  6) various bug fixing, speed improvement,...

      OM: Add new option to SYSTEMATICS program:

           --remove_weights, --keep_weights, --start_id

           See "help systematics for more details."

      OM: Allow to specify param_card, run_card,... directly via an html link.

      Bug Fixing:

      -----------

      OM: Update condor class to support CERN type of cluster (thanks Daria Satco)

      OM: Fixing a bug leading to a crash in pythia8 due to one event wrongly written when splitting the

          events for the parralelization of pythia8

      OM: Fixing an issue, leading to NAN for some of the channel of integration for complicated processes.

      OM: Fix a bug in gripack@NLO which forbids to run it when the gridpack was generated with 0 events.

      RF: Fixed bug #1694548 (problem with NLO for QCD-charged heavy vector bosons).

      RF: Another fix (adding on a fix in 2.5.5) related to FxFx merging in case there are

      RF: Fixed bug #1706072 related to wrong path with NLO gridpack mode

          diagrams with 1->3 decays.

      RF: Fixed a bug (found by SF) that gave a seriously biased resonance mass when using MadSpin for decaying a 2->1 process.

      PT: Fix in montecarlocounter.f. Previously, for NLO+PS it was reading some subleading-colour information, now all

          information passed to the MC counterterms is correctly leading colour. 

      OM: Fix systematics computation for lepton collider

      OM+VH: Remove the proposition to install pjfry by default, due to many installation problem. The user can still force to 

          install it, if he wants to.

      OM: Fix a problem of madspin when recomputing width for model loaded with --modelname option

      OM: Fix events writing for DIS (thanks to Sho Iwamoto)

      OM: Fix a problem of output files written .lhe.gz, even if not zipped (python2.6 only)

      OM: Fixing some issue related to the customised propagator options of UFO model

      Code Re-factorisation:

      ----------------------

      RF: Refactor of the HwU.f fortran code. Gives more flexibility and potentially lower

          memory requirements.

      RF: Refactor of the (NLO) code related to extra weights (for PDF/scale uncertainties).

      OM: Increase modularity of the code for the support of plugin (maddm and MPI@LO)     

          - Now we support the HPC plugin allowing to generate LO-gridpack on MPI machine

          - Plugin can now use the "launch" keyword

2.5.5(26/05/17)

      OM: Fixing bug in the creation of the LO gridpack introduced in 2.4.3. Since 2.4.3 the generated 

          gridpack were lacking to include the generated grid for each channel. This does not lead to 

          bias but to a significant slow down of the associated gridpack.

      OM: Supporting user function calling other non default function.

      OM: adding the command "update to_slha1" and "update to_slha2" (still beta)

      RF: some cleanup in the NLO/Template files. Many unused subroutines deleted.

      OM: fixing some bug related to complex_mass_scheme

      OM: fixing bug in ALOHA for C++ output (in presence of form-factor)

      OM: fixing lhe event for 1 to N process such that the <init> block is consistently set for the shower

      OM: ExRootAnalysis interface is modified (need to be requested as an analysis)

      RF: Fix for FxFx merging in case there are diagrams with 1->3 decays.

2.5.4(28/03/17)

      OM: Add a warning in presense of small width

      OM: Fix a bug related to a missing library (introduced in 2.5.3)

      OM: Improve stability of the onshell mode of MadSpin

      VH: Fix some problem related to LHAPDF

2.5.3(09/03/17)

      PT: Modified the default shower starting scale in montecarlocounter.f.

          The new reference scale from which the dampening profile is computed is sum_i mt_i/2, i

          being Born level final-state momenta.

      OM: New "special mode" for madspin accessible via "set spinmode onshell".

          This mode allow for full spin-correlation with 3 (or more) body decay but the decaying particle

          remains exactly onshell in this mode. Loop-induced production/decay are not allowed in this mode.

      OM+RF: Allowing for creation of LHE like output of the fixed order run at NLO.

          This LHEF file is unvalid for parton-shower (all PS should crash on such file). It will be 

          unphysical to shower such sample anyway.

          Two hidden parameters of the  FO_analyse_card.dat allow some control on the LHEF creation

       	  "fo_lhe_weight_ratio" allows to control the strength of a partial unweighting [default:1e-3]

             increasing this number reduce the LHEF size.

          "fo_lhe_postprocessing" can take value like nogrouping, norandom, noidentification.

             nogrouping forbids the appearance of the LHEF(version2) tag <eventgroup>

             norandom   does not apply the randomization of the events.

             noidentification does not merge born event with other born like counter-event

      RF: Better job handling for fNLO runs.

      VH: Fixing various problem with the pythia8 interface (especially for MLM merging)

      Team: Fixing a series of small crash

2.5.2(10/12/16)

      OM: improve systematics (thanks to Philipp Pigard)

      OM: new syntax to modify the run_card: set no_parton_cut

          This removes all the cut present in the card.

      OM: change the default configuration parameter cluster_local_path to None

      OM: change the syscalc syntax for the pdf to avoid using & since this is not xml compliant

      OM: avoid to bias module to include trivial weight in gridpack mode

      OM: Fix a bug making 2.5.1 not compatible with python2.6

      OM: Improve "add missing" command if a full block is missing

      OM: Fixing a bug reporting wrong cross-section in the lhef <init> flag (only in presence of 

          more than 80 channel of integration)

2.5.1 (04/11/16)

       PT+MZ: New interface for Herwig7.

              Fixed a bug in the Herwig7/Herwig++ counterterm (relevant to 2 -> n, n>2:

              in particular, the bug affected the dead zone for final-final colour connection

              in processes with more than two particles in the Born final state)

       VH: Parallelization of PY8 at LO

       OM: add the possibility to automatically missing parameter in a param_card

           with command "update missing" at the time of the card edition. Usefull for 

           some SUSY card where some block entry are sometimes missing.

       OM: Possibility to automatically run systematics program at NLO or Turn it off at LO

           (hidden entry of the run_card systematics_program = systematics|syscalc|none)

       RF: Some refactoring of the NLO phase-space generation,

           including some small improvements in efficiency.

       OM: Plugin can be include in a directory MG5aMC_PLUGIN the above directory need to be in

           the $PYTHONPATH

       OM: Fix systematics for e+ e- initial state.

       VH: Fix various bug in the HepMc handling related to PY8 (LO generation)

       OM: allow install maddm functionality (install ./bin/maddm executable)

2.5.0 (08/09/16)

     FUNCTIONALITY

       VH+OM: Adding an official interface to Pythia8 (parton shower) at Leading-Order

	        More information at https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/LOPY8Merging	   

       VH+OM+MA5: Adding an official interface to MadAnalysis5 for plotting/analysis/recasting

	        More information at https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/UseMA5withinMG5aMC	   

       OM: Introduces a new function for LO/NLO interface "systematics"

            This function allows to compute systematics uncertainty from the event sample

            It requires the event sample to have been generated with 

                - use_syst = T (for LO sample)

                - store_reweight_info = T (for NLO sample)

            At LO the code is run automatically if use_syst=T (but if SysCalc is installed)

       VH+OM: Adding the possibility to bias the event weight for LO generation  via plugin.

            More informtion: https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/LOEventGenerationBias

       VH+SP: extend support for CKKWL

     CODE IMPROVMENT / small feature

     -------------------------------

       OM: Modify the structure of the output format such that all the internal format have the same structure

       OM: Adding the Plugin directory. Three kind of plugin are currently supported

           - plugin defining a new type of output format

           - plugin defining a new type of cluster handling

           - plugin modifying the main interface of MG5aMCnlo 

           More informations/examples are available here:

           https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/Plugin

       OM: Adding the possiblity of having detailled help at the time of the edition of the cards.

            help mass / help mt / help nevents provided some information on the parameters.

       OM: NLO/LO Re-weighting works in multi-core

       OM: add an automatic update of the param_card to write the correct value for all dependent parameter.

       OM: add the check that the param_card is compatible with the model restriction.

       OM: Adding the run_card options "event_norm" for the LO run_card (same meaning as NLO one)

       VH: extend install command to install: lhapdf/pythia8

       VH: Interfaced MadLoop to COLLIER for tensor integral reduction.	   

       OM+VH: At the first loop/NLO computation, a new question will now be asked to choose which program

           to install to compute the loop. You can still install additional method later via the "install" command

       OM: Replace the mssm model by the MSSM_SLHA2 following the SLHA2 instead of the SLHA1 convention

     BUG FIXING

     ----------

       OM: Fix a bug in the helicity by helicity reweighting method. (introduced in 2.4.3)

       OM: Fix a bug in the reweight_card where relative path was not understood from the local directory 

            where the program was runned by the user.

2.4.3 (01/08/16)

        OM: Reduce the amount of log file/output generated for LO run (output can use up to three times less output).

        OM: For the LO combination of events (unweighting) pass to the method previously used for loop-induced.

            This method is faster and requires less I/O operation.

            This fully remove the need of the file events.lhe.gz which is not created anymore (further reduce the ouput size)

        OM: Optimise the code in order to be able to run scan with more than 2k steps.

        OM: Optimise the lhe_parser module (use for the unweighting/re-weighing/...) around 20% faster than before.

        OM: Fix a bug in MadSpin where the cross-section reported in the <init> block of the LHEF

            was wrongly assigned when multiple process were present in the LHEF and that different Brancing ratio

            were associated to each of those processes.

        RF: For NLO process generation, fix a problem with turning on PDF reweighting with sets that have only a

            single member. Also, allow for reweighting with up to 25 PDF sets (and their error members) for a single run.

        OM: Fixing bug allowing to specify a UFO model by his full path for NLO computation (thanks Zachary Marschal).

        OM: Fixing bug in LO re-weighting in case of helicity by helicity re-weighting. Now the events is boost back in 

            the center of mass frame to ensure consistency with the helicity definition.

2.4.2 (10/06/16)

        OM: fix a compilation problem for non standard gfortran system

        OM: reduce the need of lhapdf for standard LO run. (was making some run to test due to missing dependencies)

2.4.1 (10/06/16)

        OM: Fix a bug in fix target experiment with PDF on the particle at rest.

            The cross-section was correct but the z-boost was not performed correctly.

        OM: Fix various bug in MadSpin

        OM: Fix some bug in MLM merging, where chcluster was forced to True (introduced in 2.2.0)

        OM: Allow to specify a path for a custom directory where to look for model via the environment 

            variable PYTHONPATH. Note this used AFTER the standard ./models directory

2.4.0 (12/05/16)

        OM: Allowing the proper NLO reweighting for NLO sample

        RF: For NLO processes allow for multiple PDF and scales reweighting, directy by inputting lists

            in the run_card.dat.

        VH: Interfaced MadLoop to Samurai and Ninja (the latter is now the default)

        HS: Turn IREGI to off by default

        MZ: new NLO generation mode. It is more efficient from the memory and CPU point of 

            view, in particular for high-multiplicity processes. 

            Many thanks to Josh Bendavid for his fundamental contribution for this.

            The mode can be enabled with

            > set low_mem_multicore_nlo_generation True

            before generating the process.

        OM: Adding the possibility to use new syntax for tree-level processes:

            QED==2 and QCD>2: The first allows to select exactly a power of the coupling (at amplitude level

            While the second ask for a minimum value.   

        RF: In the PDF uncertainty for fixed-order NLO runs, variations of alphaS were not included.

        OM: In MLM matching, fix a bug where the alpha_s reweighting was not fully applied on some events. 

            (This was leading to effects smaller than the theoretical uncertainty)

        OM: Fixing the problem of using lhapdf6 on Mac

        MZ: Faster interface for LHAPDF6

        OM: Add support of epsilon_ijk in MadSpin

        OM: Fix multiple problem with multiparticles in MadSpin

        OM: Improve spinmode=None in MadSpin

        OM: Update the TopEffTh model

        MZ: Fix problem with slurm cluster

        OM: Improve scan functionalities

        PT: New way of handling Pythia8 decays

        RF: Fixed a bug that resulted in wrong event weights for NLO processes when requiring

            a very small number of events (introduced in 2.3.3)

        OM: Allow to keep the reweight information in the final lhe file for future computation 

        MZ: updated FJcore to version 3.1.3 (was 3.0.5)

2.3.3 (15/10/15)

        OM: Allow new syntax for the param_card: instead of an entry you can enter scan:[val1, val2,...]

            To perform a scan on this parameter.

        OM: Having two mode for "output pythia8" one (default) for pythia8.2 and one for pythia8.1 (with --version=8.1)

        RF: Rewriting of job-control for NLO processes. Better accuracy estimates for FO processes

        RF: Fix for factorisation scale setting in FxFx merging when very large difference in scale in the

            non-QCD part of a process. 

        RF: Better discarding of numerical instabilities in the real-emission matrix elements. Only of interested for

	    processes which have jets at Born level, but do not require generation cut (like t-channel single-top). 

        RF: Added an option to the run_card to allow for easier variation of the shower starting scale (NLO only).

        RF: Fixed a problem in the setting of the flavour map used for runs with iAPPL >= 1. 

        RF: Allow for decay processes to compute (partial) decay widths at NLO accuracy (fixed order only).

        OM: (SysCalc interface) Allow to bypass the pdf reweighting/alpsfact reweighting

        MZ: fixed bug related to slurm clusters

	OM: remove the addmasses.py script of running by default on gridpack mode. 

            if you want to have it running, you just have to rename the file madevent/bin/internal/addmasses_optional.py to

            madevent/bin/internal/addmasses_optional.py and it will work as before. (Do not work with SysCalc tag)

        OM: make the code compatible with "python -tt" option

2.3.2.2 (06/09/15)

        VH: Finalized the MG5aMC-GoSam interface

2.3.2(20/08/15)   

        OM: Improve reweighting module. (https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/Reweight)

            New Capabilities: 

             - allow to reweight by loop-induced processes

             - allow to change model 

             - allow to change process definition

             - allow to unweight the sample to have an idea of the statistical power.

             - allow to perform some crude reweighting on NLO sample (reweighting by LO matrix element). NLO

               accuracy is not preserved (in general) for such computation.

            New dependencies:

	     - require the f2py module (part of numpy)

	OM: change the kt-durham cut (at LO) such that particle comming from decay are not impacted if cut_decays

            is on False.

        VH: Fixed the check in helas wavefunction appearance order in an helas diagrams. It failed in cases

	    where additional wf were created during the fix of fermion flow in presence of majorana fermions.         

	RF: Fixed a bug in the aMCFast/ApplGrid interfaced introduced in the previous version.

        OM: Fix a crash when using mssm-no_b_mass model (due to the SLHA1-SLHA2 conversion)

        OM: Fix a bug in the add_time_of_flight function (not called by default) where the displaced vertex information

            was written in second and not in mm as it should. Note that this function can now be run on the flight

	    by adding the following line in the run_card: "  1e-2 = time_of_flight #threshold for the displaced vertex" 

	RF: Small fix that leads to an improvement in the phase-space generation for NLO processes

        OM: Fix a crash introduce in 2.3.0 when running sequentially in the same directory (thanks Gauthier)

        OM: Improve aloha in the case of some expression reduces to pure float.

        OM: In MadSpin, allow to specify cut for the 1>N decay in spinmode=none.

	RF: Fixed a bug that gave bogus results for NLO runs when using an internal PDF which is not

            NNPDF (like for the old cteq_6m, etc).

	RF: Fixed a bug in the PDF combination in the HwU histograms: there was no consistent use if Hessian

            and Gaussian approaches for MSTW/CTEQ and NNPDF, respectively.

        OM: Fixed a small bug in EWdim6 which was removing a coupling in AZHH interaction.

        OM: improve customize_model function to avoid problem with unity coupling.

	RF: Improved the treatment of the bottom Yukawa. Thanks Marius Wiesemann. 

2.3.1  

     OM+VH: Automation of event generation for loop-induced processes.

		OM: Automatic change of the p/j definition to include the b particle if the model has a massless b.

	RF: Reduce the collision energy for the soft and collinear tests: for 100TeV collider many were failing

	    due to numerical instabilities. 

        OM: Fixing bug associate to the epsilon_ijk structure

        OM+VH: Various bug fixing for the loop-induced processes

        OM: Fix a crash in MadWidth which occurs for some 4 body decay

        PT: Fixed a bug concerning the use of Herwig++ with LHAPDF. Bug was introduced in 2.3.0.beta

	OM: Fix a crash in ALOHA for form-factor in presence of fermion flow violation

2.3.0.beta(10/04/15) OM+VH: Adding the possibility to compute cross-section/generate events for loop-induced process

		JB+OM: Addign matchbox output for matching in the Matchbox framework

                OM+VH: Change the handling of the run_card.

                      - The default value depends now of your running process

                      - cut_decays is now on False by default

                      - nhel can only take 0/1 value. 1 is a real MC over helicity (with importance sampling)

                      - use_syst is set on by default (but for matching where it is keep off)                    

                      - New options added: dynamical_scale_choice, it can take the following value

		            -1 : MadGraph5_aMC@NLO default (different for LO/NLO/ ickkw mode) same as previous version. 

                             0 : Tag reserved for user define dynamical scale (need to be added in setscales.f).

                             1 : Total transverse energy of the event.

                             2 : sum of the transverse mass 

                             3 : sum of the transverse mass divide by 2 

			     4 : \sqrt(s), partonic energy 

                OM: Cuts are also applied for 1>N processes (but the default run_card doesn't have any cut).         

                PT: Set command available for shower_card parameters

                OM: New MultiCore class with better thread support

                RF: Fixed a bug in the aMCfast/APPLGrid interface introduced in version 2.2.3

		RF: Fixed a bug in the setting of the integration grids (LO process generation) for the minimum

		    energy needed for photons. The bug did not lead to any bias in event generation.

		RF: Re-factoring of the structure of the code for NLO+PS computations.

		RF+VH: Replaced the default topdrawer histograms with HwU histograms for f(N)LO runs

                    and allow it also for aMC@NLO runs.

		RF+VB: Allow for variable bin-sizes in MG5_aMC+aMCfast+ApplGrid runs.

                MZ+RF: Added 'LOonly' asNLO mode to export processes without any real and virtuals 

                       (useful e.g. for higher multiplicities when merging)

		RF: Added support for the computation of NLO+NNLL jet veto cross sections

		RF: Fixed a bug in the Pythia8 interface: FxFx was not correctly initialized and all

                    events were incorrectly kept (introduced in v.2.2.3)

                OM: Improve the function "print_result" (in the running interface)

                    add an option --format=short allowing to print the result in a multi-column format

                OM: Possibility to not transfer pdf file to the node for each job. 

                       This is done via a new option (cluster_local_path) which should contain the pdf set.

                       This path is intented to point to a node specific filesystem.

                    New way to submit job on cluster without writting the command file on the disk.

                OM: Allowing MadSpin to have a mode without full spin-correlation but handling three (and more) 

                    body decay. (set spinmode=none).

                OM+PA: Fixing various bug in MadSpin.

2.2.3(10/02/15) RF: Re-factoring of the structure of the code for fNLO computations.

                OM: Fix a bug in MadWeight (correlated param_card was not creating the correct input file)

		RF: When requiring more than 1M events for (N)LO+PS runs, do not go to higher precision than 0.001

                    for the grids and cross section (can be overwritten with the req_acc run_card parameter).

		RF: Make sure that reweight info (for PDF and scale uncertainties) also works for UNLOPS events.

		RF: When setting the B's stable in the shower_card, also set the eta_b (PDG=551) stable.

		OM: Change the Breit-Wigner splitting for the multi-channel integration, use the bwcutoff instead of

                    the hardcoded value 5.

                MZ: Fix to bug 1406000 (segfault appearing when doing FxFx merging). Thanks to Josh Bendavid for

                    having reported it

                MZ: Fix to a bug occurring when generating event in the "split" mode: the required output was 

                    not correctly specified

                OM: The built-in pdf "nn23lo" and "nn23lo1" where associate to the wrong lhapdfid in the lhef file

                    This was creating bias in using SysCalc. (Thanks Alexis)

                OM: Fix a bug in the LO re-weighing  module which was removing the 

                    SysCalc weight from the lhe file (thanks Shin-Shan)

                Team: Fixes to different small bugs / improvement in the error and warning messages

		RF: For aMC runs, If a NAN is found, the code now skips that PS point and continues instead of

		    leading to NAN.

                RF: For fNLO runs the virtuals were included twice in the setting of the integration grids. 

                    This was not leading to any bias in previous version of the code.

2.2.2(06/11/14) OM: Correct a bug in the integration grid (introduces in 2.1.2). This was biasing the cross-section of 

                    processes like a a > mu+ mu- in the Effective Photon Approximation by three order of magnitude.

                    For LHC processes no sizeable effect have been observe so far.

                MZ: some informations for aMC@NLO runs which were before passed via include files are

                    now read at runtime. The size of executables as well as compilation time / memory usage

                    is reduced for complicated processes

                RF: Fix crash #1377187 (check that cuts were consistent with the grouping was too restrictive) 

		RF: For NLO running: added 'strip' to the makefiles to reduce executable sizes (removes symbol info)

		Stefano Carrazza (by RF): fix for the photon PDF for the internal NNPDF sets

		RF: Improved the check on the consistency of the cuts and the grouping of subprocesse (LO running)

                PT: enabled PYTHIA8.2

                OM: restore the usage of external gzip library for file larger than 4Gb which were crashing with

                    the python gzip library

                OM: Fixing the default card for Delphes

                OM: Improve support of lsf cluster (thanks Josh) 

                OM: Adding support for the UFO file functions.py (which was ignored before)

                OM: Reduce the amount of RAM used by MadSpin in gridpack mode.

                OM: discard in MadWidth partial width lower than \Lambda_QCD for colored particle.

2.2.1(25/09/14) OM: Fix a bug preventing the generation of events at LO due to a wrong treatment of 

                      the color-flow.

2.2.0(24/09/14) VH: General mixed order corrections in MadLoop (only), including QCD/EW/QED and 

                    the UFO@NLO model 'loop_qcd_qed_sm'.

                VH: Re-design of both the tree and MadLoop matrix elements output to compute

                    contributions of different coupling order combinations independently from one another.

                VH+HS: Tensor integral reduction as implemented in PJFry and IREGI readily available

                    and interfaced to MadLoop's output.

                VH: Re-structuring of MadLoop's standalone output so as to easily create a single dynamic 

                    library including many processes at once. Useful for interfacing MadLoop to other MC's

                    and already working with Sherpa.

                VH+HS: This branch contains all the fixes for proper treatment of the latest BSM@NLO models 

                    produced by FeynRules@NLO. In particular, the fixed related to the presence of majorana 

                    particles in loop ME's.

                RF: Corrected the behaviour of the pdfcode parameter in the shower_card for NLO+PS runs.

                PT: Redesigned shower_card.dat and eliminated modbos options for Herwig6          

                RF: Change the SPINUP information in the NLO LHEF from 0 to 9 (i.e. sum over helicities)

                RF: Fixed a bug in the check on the determination of the conflicting BWs.

		RF: Added the aMCfast+APPLgrid interface (arXiv:1406.7693 [hep-ph])

                PT: Redesigned shower_card.dat and eliminated modbos options for Herwig6          

                RF: Change the SPINUP information in the NLO LHEF from 0 to 9 (i.e. sum over helicities)

                RF: Fixed a bug in the check on the determination of the conflicting BWs.

                MZ: enabled LHAPDF6 interface 

                OM: Fixed a crash in some HEFT merging case.

                OM: Fix various compatibility problem created by the LHEFv3 version (Thanks to S. Brochet)

                OM: Fix a bug for MadSpin in gridpack mode

                OM: Add a routine to check the validity of LHE file (check_event command)

                OM: Fix bug for UFO model with custom propagators

                OM: Fix Bug in the computation of cross-section in presence of negative contribution 

                OM: Change colorflow information of LHE file in presence of two epsilon_ijk

                    since PY8 was not able to handle such flow in that format.

                OM: Add the function print_result for aMC@(n)LO run.

                OM: Add some shortcut in the card edition 

                    set ebeam 500 # edit both beams

                    set lpp 0     # edit both lpp1 and lpp2

                    set lhc 14    # configure for LHC 14TeV

                    set ilc 1000  # configure for ilc 1TeV

                    set fixed_scale 100 # set all scale to fixed and at 100GeV

		    set showerkt T # set showerkt on T in the shower card

 		    set qcut 20    # set the qctu to 20 in the shower card 

                OM: Fix a bug in the card edition mode which was sometimes returning to default value

                    which were edited by hand and not via the set command.

                Seoyoung Kim (by OM): Implementation of the htcaas (super-)cluster support.

		Juan Rojo (by RF): extended the 3 internal NNPDF sets for scales relevant for a 100TeV collider.

                OM: Fix a problem with the creation of DJR plot with root 6

                OM: allow the set the width to Auto in NLO computation (width computated at LO accuracy)

                OM: Adding the possibility to have automatic plot after the parton shower for Herwig6/Pythia6.

                    This require MadAnalysis and the pythia-pgs package. 

2.1.2(03/07/14) OM: Fix a bug in ALOHA in presence of customized propagator (Thanks Saurabh)

                OM: Fixing some compilation issue with MadWeight (Thanks A. Pin)

                OM: Fixing a bug preventing MadWidth to run due to the model prefixing (depending

                    on the way it was called)

                OM: Fixing a bug in MadSpin in the mssm model

		RF: Added the invariant mass and DeltaR cuts for *same flavour* opposite sign lepton

                    pairs to the run_card for NLO-type generations.

		RF: Added FxFx and UNLOPS merging with Pythia8

		RF: Prevent an infinite loop in MadSpin by forcing the correct sign to the invariants

		RF: Catch a possible error related to grouping subprocesses and setcuts

		OM: Fix an error when using the "customize_model" command

                S. Mrenna (by OM): Fix the include file in pythia8 output to be compliant with the latest

                    PY8 version

		RF: Added a string with functional form for the scales to the event file banner (NLO only)

                S. Brochet (by OM): Fix a bug in MadSpin with the writting of the mother ID in the LHE file.

                    Force the tag in the banner to always have the same case

                    increase momenta precision for the LHE file written by MadSpin 

                    (thanks a lot to S. Brochet for all those patch)

                PT: Integrated Jimmy's underlying event for Herwig6

                OM: improve "add model" functionality allow to force particle identification.

                PT: Bug fix in the normalisation of topdrawer plots for option 'sum' (as opposed to 'average')

		RF: Fixed a bug related to the random seed when the code was not recompiled for a new run.

                OM: Fixed a bug in MadEvent(LO) run, the generated sample were bias in presence of 

                    negative cross-section. A negative cross-section is possible only if you use a NLO PDF 

                    and/or if you edit the matrix.f by hand to have a non-definite positive matrix-element.

		OM: When importing a model, check that there is not more than 1 parameter with the same name.

                PT: Subsantial recoding of montecarlocounter.f and of a subroutine in fks_singular.f. Will help 

                    future extensions like EW NLO+PS matching and numerical derivatives      

                OM: Fixing a wrong assignement in the color flow in presence of epsilon_ijk color structure.

                    Those events were rejected by Pythia8 due to this wrong color-flow.

                MZ: Added the possibility to run the shower on a cluster, possibly splitting the lhe file 

                MZ: The c++ compiler can be specified as an option in the interface. On MACOSX, clang should

                    work now

                OM: MadEvent output is now LHEFv3 fully compliant. A parameter in the run_tag (lhe_version) 

                    allows to return LHEF version 2 format for retro-compatibility.

2.1.1(31/03/14) OM: Change the way the UFO model is handle by adding a prefix (mdl_) to all model variable.

                    This avoid any potential name conflict with other part of the code. This feature can be

                    bypassed by using the option --noprefix when importing the model.

                OM: New command "add model XXX" supported. This command creates a new UFO model from two UFO model.

                    The main interest stand in the command "add model hgg_plugin", which add the effective operator

                    h g g to the original UFO model. The model is written on disk for edition/future reference.

		RF: Reduced the calls to fastjet and skipped the computation of the reweight coeffients when

 		    they are not needed.

                OM: Fixed a bug for LO processes where the MMLL cut was not applied to the event sample.

                PA: Fix a bug in MadSpin to avoid numerical instabitities when extracting t-channel invariants

                    from the production event file (see modification in driver.f, search for 'MODIF March 5, 2014') 

                OM: Better determination of which particles are in representation 3/3bar since FR is ambiguous on that point.

                    Now the determination also looks for 3 -3 1 interactions to check if that help.

                OM: Fix a bug(crash) in MW linked to the permutation pre-selection module.

		RF: Better comments in the code for user-defined cuts in the ./SubProcesses/cuts.f function.

                    Also the maxjetflavor parameter in the run_card is now actually working.

                OM: Update SysCalc to:

                      - Fix a bug that some file where sometimes truncated.

                      - Allow for independant scale variation for the factorization/renormalization scale.

                RF+OM: Improve the handling of conflicting Breit-Wigners at NLO

		RF: Print the scale and PDF uncertainties for fNLO runs in the summary at the end of the run

2.1.0(21/02/14) MADWEIGHT RELEASE:

                ------------------

                OM+PA: First Official release of MadWeight inside MG5_aMC

                      Main update:

                        - ISR corrections

                        - possibility to use narrow-width approximation

                        - introducing a module for the pre-selection of the parton-jet assignment.

                        - extended formalism for the transfer function (more generic)

                        - possibility to evaluate the weights for multiple choices of transfer function 

      			  on the same phase-space point. The phase-space is optimized for the first set of 

                          parameters.

		      Speed update:

                        - More efficient way to group the computation for identical process with different final state.

                        - Possibility to Monte-Carlo over the permutation.

                        - More efficient way to choose between the various change of variable.

                        - Possibility to use mint (not compatible with all of the options)

			- Possibility to use sobol for the generation of PS point (sometimes faster than pure 

                          random point generator.

                MadEvent/aMC@NLO UPDATE/BUG FIXING:

 		-----------------------------------

                OM: Fix critical bug (returns wrong cross-section/width) for processes where the center of mass 

                    energy of the beam is lower than 1 GeV. So this has no impact for LHC-collider phenomenology.

                    This can also impact computation of decay-width if the mass of that particle is below 1 GeV.

		RF: Critical bug fixed (introduced in 2.0.2) for fixed order NLO runs that could

		    give the wrong cross section when the phase-space generation is inefficient

                    (like in the case for conflicting Breit-Wigners). This bug did not affect runs

                    with matching to the parton shower.

                OM: Fix a bug leading to a crash with some decay syntax. i.e., p p > t t~, (t > w+ b), (t~ >w- b~)

                OM: Fix format of LHE output for 1>N events when the <init> and mother information were wrongly set 

                    to LHC default. Specific support of this option will be part of pythia8 (8.185 and later)

                OM: Fix the syntax for the custom propagator to follow the description of arXiv:1308.1668 

                OM: Allow to call ASperGe on the flight if ASperGe module is include in the UFO model.

                    just type "asperge" at the moment where the code propose you to edit the param_card.

                MADSPIN UPDATE:

                ---------------

                OM: Allow to use another model for the decay than the one used for the production of events.

                    You are responsible of the consistency of the model in that case.

                PA: Include hellicity information for the events generated by MadSpin.

                OM: Fix a bug in MadSpin preventing the gridpack to run with NLO processes.

2.0.2(07/02/14) RF: Suppressed the writing of the 'ERROR in OneLOop dilog2_r' messages (introduced in the 

                    previous version)

                OM: Fix the bug that the shower_card.dat was wrongly identified as a pythia_card.

                OM: add one MadSpin option allowing to control the number of simultaneous open files.

                OM: Fix a bug in eps preventing evince preventing label to be displayed on page 2 and following

                    Thanks to Gauthier Durieux for the fix.

                OM: Fix a bug(crash) for p p > w+ w- j j introduce in 2.0.0 due to some jet sometimes tagged as QCD

                    and sometimes not (which was making the automatic scale computation to crash)

                OM: Change the way to writte the <init> line of the lhe file to take into account

                    - process with more that 100 subprocesses (note that you need to hack the pythia-pgs

                      package to deal with such large number of sub-process

                    - deal with pdf identification number bigger than 1 million.  

                OM: Fixed a bug preventing the Madevent to detect external module (pythia-pgs, syscalc,...)

                    Bug #1271216 (thanks Iwamoto)

                PT: PYTHIA8 scale and pdf variations

2.0.1(20/01/14) OM: Fix a bug in h > l+ l- l+ l- for group_subproceses =False (decay only). A follow up of 

                    the bug fix in 2.0.0

                RF: Replaced the Error#10 in the generation of the phase-space (for NLO) to a Warning#10.

                    In rare cases this error stopped the code, while this was not needed.

                RF: When using non-optimized loop output, the code now also works fine.

                OM: Modification of the code to allow the code to run on our servers

                VH: Improve the timing routine of the NLO code (displayed in debug mode)

                VH: FIX the import of old UFO model (those without the all_orders attribute).

                OM: Add a functionalities for restrict_model if a file paramcard_RESTRICTNAME.dat

                    exists, then this file is use as default param_card for that restriction.

                HS: Updated CutTools to v1.9.2

2.0.0(14/12/13)    CHANGE IN DEFAULT:

                   ------------------

                      OM: Change the Higgs mass to 125 GeV for most of the model (but the susy/v4 one).

                      OM: Change the default energy of collision to 13 TeV.

                      RF: Default renormalisation and factorisation scales are now set to H_T/2. (for aMC only)

                   MadEvent Update:

                   ----------------

                      OM+SF+RF: Add Frixione Photon isolation (also for aMC)

                      OM: Implementation of the reweight module for Leading Order matrix-element

                      JA+OM+AK: Store parameters needed for systematics studies.

                          This can be turned on with the use_syst parameter in

                          run_card.dat.

                          This output can be used to generate event weights for

                          a variety of variational parameters, including scalefact,

                          alpsfact, PDF choice, and matching scale. Note that this require

                          pythia-pgs v2.2 for matching scale.

                      OM+JA+Chia: Implement MadWidth (automatic/smart computation of the widths)

                      OM: Support for Form-Factor defined in the UFO model. and support for model

                          parameter presence inside the Lorentz expression.

                      OM: Support for a arbitrary functions.f file present inside the UFO model. 

                      JA: Included <clustering> tag in matched .lhe output, to be 

                          used together with Pythia 8 CKKW-L matching. This can be 

                          turned off with the clusinfo flag in run_card.dat.

                      JA: New treatment of matching for diagrams that have no

                          corresponding lower-multiplicity diagrams. Jets that

                          are not classified as shower-type emission jets are

                          flagged in the cluster scale info at the end of the event,

                          which is recognized by the Pythia interface in Pythia-PGS

                          package v. 2.2. For such jets, xqcut does not apply. This

                          allows for consistent matching e.g. of p p > w+ b b~ in 

                          the 4-flavor scheme. Note that auto_ptj_mjj must be set to

                          .false. for this to work properly.

                      OM: Change model restriction behavior: two widths with identical are not merged anymore.

                      S.Prestel(via OM): implement KT Durham cut. (thanks to Z. Marshall)

                      OM: Improved check for unresponsive of PBS cluster (thanks J. Mc Fayden)

                      OM: Implement a maximum number (2500) of jobs which can be submitted at the same time

                          by the PBS cluster. This number is currently not editable via configuration file.

                   MadEvent Bug Fixing:

                   --------------------

                      OM: Fix a bug for h > l+ l- l+ l- (introduce in 1.5.9) where the phase-space parametrization 

                          fails to cover the full phase-space. This bugs occurs only if two identical particles decays

                          in identical particles and if both of those particles can't be on-shell simultaneously. 

                      OM: Fix a bug for multi_run sample in presence of negative weights (possible if NLO pdf)

                          The negative weights were not propagated to the merged sample. 

                          (thanks to Sebastien Brochet for the fix)

                   aMC@NLO Update:       ! FIRST OFFICIAL RELEASE WITH NLO CAPABILITIES !

                   ---------------

                       PT: MC@NLO matching to PYTHIA8 available.

                       RF: Added FxFx merging

                       RF: Use MC over helicities for the MadLoop virtual corrections.

                       RF: Using "virtual tricks" to reduce the number of PS points for which to include

                           the virtual corrections, leading to a speed up of the code.

                       OM+SF+RF: Add Frixione Photon isolation (also in MadEvent)

                       PA+OM: Fast version of MadSpin implemented (PS generation in Fortran).

		       OM: Allow to have MadSpin in "gridpack mode" (same cards/same decay). 

                           Add in the madspin_card "set ms_dir PATH". If the path didn't exist MS will

                           create the gridpack on that path, otherwise it will reuse the information 

                           (diagram generated, maximum weight of each channel, branching ratio,...)

                           This allow to bypass all the initialization steps BUT is valid only for the 

                           exact same event generation.

                       VH: Fixed set_run.f which incorrectly sets a default value for ptl, drll and

                           etal making the code insensitive to the values set in the run_card.dat 

                       VH: Fixed a bug in MadLoop that doubled the computing time for quad precision

                       VH+RF: Added MadLoop stability information to the log files (and run summary

                           in DEBUG mode).

                       RF: Fixed a stability problem in the reweighting to get PDF and scale uncertainties.

                       VH+RF: Improved the Binoth LHA interface

                       RF: Improved the multi-channeling for processes with more amplitudes than diagrams.

                       RF: Added a new parameter in the run_card to set the required accuracy for fixed 

                           order runs.

                       SF+RF: Improved handling of fixed order analysis

                    From beta3 (13/02/13):

                       OM: Merge with 1.5.7+1.5.8 (See information below)

                       OM: Allow the customize_model to be scriptable in a 

                           friendly way.

                       RF: Event normalization is now Les Houches compliant (the weights

		           of the events should average to the total rate). The old normalization

                           can still be chosen by setting the flag 'sum = event_norm' in the run_card.

		       RF: Fixes a bug related to the mass of the tau that was not consistently 

 		           taking into account in the phase-space set-up.

		       VH: Fixed the incorrect implementation of the four gluons R2 in the loop_sm UFO.

		       VH: Fixed the UV renormalization for the SM with massive c quarks.

                       RF: The PDF uncertainty for NNPDF is now also correctly given in the run summary

                       RF: Some improvements in the test_MC and test_ME when matrix elements are

                           numerically very large

                       OM+RF: Added the running at LO to the 'launch questions'

                       OM: Allow "check" command to use a event file.

                           This will use the related param_card and the first

                           event compatible with the requested process.

                       RF: Improved the phase-space generation in the case of competing resonances

                    From beta2 (23/12/12):

                       MG5 Team: Include 1.5.4+1.5.5+1.5.6 modifications

                       MadSpin Team: Include MadSpin

                       VH: Fix computation in the Feynman gauge for the loops

                       RF: automatic computation of the NLO uncertainties

                       OM: NLO can now be runned with no central disk

                       MZ: change the format of number (using e and not d)

                       MZ: compilation and tests are possible in multicore

                       RF: allow to precise either uncertainty or number of events

                           for aMC@NLO/NLO

                       OM: ./bin/mg5 cmd.cmd is now working for NLO process

                    From beta1 (31/10/12):

                       aMCatNLO Team: First public (beta) version of aMCatNLO.

                         In order to learn aMCatNLO, please do "tutorial aMCatNLO"

                         Please also visit: http://amcatnlo.cern.ch/list.htm for more

                         information.

1.5.15 (11/12/13) OM: Fix the auto-update function in order to allow to pass to 2.0.0

1.5.14 (27/11/13) OM: Add warning about the fact that newprocess_mg5 is going to be remove in MG5_aMC_V2.0.0

                  OM: Improved cluster submision/re-submition control. 

1.5.13 (04/11/13) OM: Implement a function which check if jobs submitted to cluster are correctly runned.

                      In case of failure, you can re-submitted the failing jobs automatically. The maximal 

                      number of re-submission for a job can be parametrize (default 1) and how long you have to

                      wait before this resubmission [to avoid slow filesystem problem, i.e. condor](default 300s)

                      Supported cluster for this function: condor, lsf, pbs

                  OM: Fix a problem when more than 10k diagrams are present for a given subprocesses.

                      (tt~+4jets).

                  BF: Change nmssm model (The couplings orders were not correctly assigned for some triple 

                      Higgs interactions) 

                  OM: use evince by default to open eps file instead of gv.

		  OM: Fix a problem with the set command for the card edition for the mssm model.

                  OM: Update EWdim6 paper according to the snowmass paper. (3 more operator)

                      The default model is restricted in order to exclude those operators. In order

                      to have those you have to use import model EWdim6-full

                  OM: Fix bug #1243189, impossible to load v4 model if a local directory has the name of

                      the models (which is present in the models directory)

                  OM: Fix a bug in the complex mass scheme in the reading of the param_card (it was clearly stated)

                  OM: Improve numerical stability of the phase-space point generation. (thanks Z. Surujon)

1.5.12 (21/08/13) OM: Improve phase-space integration for processes with strong MMJJ cut. Cases where

                      the cross-section were slightly (~4%) under-evaluated due to such strong cut.

                  OM: Add a command print_results in the madevent interface. This command print the 

                      cross-section/number of events/... 

                  OM: change the way prompt color is handle (no systematic reset). Which provides better

                      result when the log is printed to a file. (thanks Bae Taegil) 

                  OM: Fix Bug #1199514: Wrong assignment of mass in the lhe events file if the initial 

                      state has one massive and one massless particles. (Thanks Wojciech Kotlarski)

                  OM: Fix a compilation problem for SLC6 for the installation of pythia-pgs

                  OM: Fix a crash linked to bug #1209113.

                  OM: Fix a crash if python is not a valid executation (Bug #1211777)

		  OM: Fix a bug in the edition of the run_card if some parameters were missing in the cards

                      (Bug #1183334)

1.5.11 (21/06/13) OM: Fix CRITICAL bug (returning wrong cross-section) for processes with more than

                      one W decaying leptonically. For such processes the lepton cuts were also used

                      on the neutrino particle reducing the cross-section. This bug was present only

                      for group_subprocesses=True (the default)

                  OM: Fix Bug #1184213: crash in presence of GIM mechanism (occur on some 

                      LINUX computer only)

                  OM: The compilation of madevent is now performed by the number of core specify

                      in the configuration file. Same for pythia, ...

                  OM: Improve support for Read-Only system

                  OM: Fix a bug with the detection of the compiler when user specifiy a specific

                      compiler.

                  OM: Fix a problem that MG5 fails to compute the cross-section/width after that 

                      a first computation fails to integrate due to a wrong mass spectrum. 

                  OM: Fix a wrong output (impossible to compile) for pythia in presence of photon/gluon

                      propagator (introduce in 1.5.8)

                  OM: Allow to have UFO model with "goldstone" attribute instead of "GoldstoneBoson", since

                      FR change convention in order to match the UFO paper.

1.5.10 (16/05/13) OM: Fix Bug #1170417: fix crash for conjugate routine in presence of 

                      massless propagator. (introduce in 1.5.9)

                  OM: Fix question #226810: checking that patch program exists before

                      trying to update MG5 code.

                  OM: Fix Bug #1171049: an error in the order of wavefunctions 

                      making the code to crash (introduce in 1.5.7)

		  OM: Allow to use an additional syntax for the set command.

                      set gauge = Feynman is now valid. (Was not valid before due to the '=')

                  OM: Fix By Arian Abrahantes. Fix SGE cluster which was not working when

                      running full simulation (PGS/Delphes).

                  OM: adding txxxxx.cc (Thanks to Aurelijus Rinkevicius for having 

                      written the routine) 

                  OM: Fix Bug #1177442. This crash occurs only for very large model. 

                      None of the model shipped with MG5 are impacted.

                  OM: Fix Question #228315. On some filesystem, some of the executable 

                      loose the permission to be executable. Recover those errors 

                      automatically.

                  OM: Modify the diagram enhancement technique. When more diagram have 

                      the same propagator structure we still combine them but we now include

                      the interference term in the enhancement technique for those diagrams.

                      This fix a crash for some multi-jet process in presence of non diagonal

                      ckm matrices.

1.5.9 (01/04/13)  JA: Fix bug in identification of symmetric diagrams, which could

                      give the wrong propagators included in event files for certain

                      processes (such as p p > z z j, z > l+ l-). Apart from the 

                      propagators (with status 2) in the event file, this bug didn't

                      affect any other results (such as distributions).

                  JA: Fix problem in gensym which made some decay chain processes

                      slower than they should be. Thanks Eric Mintun for reporting.

                  JA: Fix problem in event clustering (introduced in v. 1.5.8)

                      which made events from some processes fail Pythia running.

                  JA: Fixed bug #1156474, Pythia 8 C++ matrix element output for 

                      decay chain processes such as p p > z j, z > j j.

                      (Bug #1156474)

                  JA + OM: Automatically remove libpdf and libgeneric before survey,

                      so everything works automatically when switching between

                      built-in PDFs and LHAPDF.

                  JA: Allow syntax / to remove particles in the define command.

                      Example: define q = p / g

                  JA: Added fat warning if any decay process in a decay chain

                      includes a particle decaying to itself (as is the case

                      if you do w+ > all all, since you include w+ > w+ a).

                  JA: Forbid running newprocess_mg5 from a process directory

                      that has already been generated, to avoid confusion.

                  OM: Fix lxplus server issue (Bug #1159929)

                  OM: Fix an issue when MG5 directory is on a read only disk 

                      (Bug #1160629)

                  OM: Fix a bug which prevent to have the pythia matching plot/cross-section

                      in some particular case.

                  OM: Support of new UFO convention allowing to define custom propagator.

                      (Both in MG5 and ALOHA)

                  OM: Change ALOHA default propagator to have a specific expression for the

                      massless case allowing to speed up matrix element computation with 

                      photon/gluon.

                  OM: Correct the default spin 3/2 propagator (wrong incoming/outcoming 

                      definition)

                  ML (by OM): Adding support of the SLURM cluster. Thanks to 

                      Matthew Low for the implementation.

                  OM: Fixing the standalone_cpp output for the mssm model. (only model impacted)

                      Thanks to Silvan S Kuttimalai for reporting. 

                  OM: Fix Bug #1162512: Wrong line splitting in cpp when some name were very long.

                      (shorten the name + fix the splitting)

1.5.8 (05/03/13)  OM: Fix critical bug introduce in 1.5.0. ALOHA was wrongly written

                      HELAS routine for expression containing expression square. 

                      (like P(-1,1)**2). None of the default model of MG5 (like sm/mssm)

                      have such type of expression. More information in bug report #1132996

                      (Thanks Gezim) 		

                  OM+JA: install Delphes now installs Delphes 3 

                      [added command install Delphes2 to install Delphes 2]

                  OM: Add command in MadEvent interface: add_time_of_flight

                      This command modifies the lhe events file by adding the time of 

                      flight information in the lhe events. To run this you need to do

                      $> ./bin/madevent

                      MGME> generate_events --laststep=parton -f 

                      MGME> add_time_of_flight

		      MGME> pythia    [if needed]

                  OM: Fix bug in pythia8 output for process using decay chains syntax.

                      See bug #1099790.

                  CDe+OM: Update EWdim6 model

                  OM: Fix a bug preventing model customized via the "customize_model"

                      command to use the automatic width computation.

                  OM: Change model restriction behavior: a value of 1 for a width is 

                      not treated as a restriction rule.

                  OM: Fix incomplete restriction of the MSSM model leading to inefficient

                      process merging (and larger-than-necessary files) for the MSSM.

                  OM: Correct bug #1107603 (problem with condor cluster for submission 

                      associated to a large number of jobs). Thanks Sanjay.

                  JA: Fix one part of the problem in bug #1123974: take into 

                      account invariant mass cuts mmXX above the peak range in 

                      s-channel resonances in the phase space integration,

                      to make sure such channels find events even for narrow

                      invariant mass cut ranges. Please note the discussion in 

                      that bug report for other types of channels however.

                  JA: Fixed bug #1139303: matrix elements for identical 

                      decay chain processes with different propagators (such as 

                      p p > w+, w+ > e+ ve and p p > w-,  w- > vm~ mu-) 

                      are now no longer combined, to ensure that resonances are

                      correctly represented in event file.

                  OM: Support lhapdf set which contains photon (See bug #1131995).

                  RF+JA: Reuse last two PDF calls also for LHAPDF PDFs, clarify code

                      for reuse of PDFs in pdg2pdf.f and pdg2pdf_lhapdf.f

                  OM: Update the default delphes card to latest Delphes version. This 

                      default card is automatically overwritten by the default Delphes

                      card when running "install Delphes".

                  JA: Make sure cuts are only checked once per event - this can save

                      a lot of time for multiparton event generation.

                  OM: Fix Bug #1142042 (crash in gridpack).