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// main02.cc is a part of the PYTHIA event generator.
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// Copyright (C) 2012 Torbjorn Sjostrand.
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// PYTHIA is licenced under the GNU GPL version 2, see COPYING for details.
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// Please respect the MCnet Guidelines, see GUIDELINES for details.
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// This is a simple test program. It fits on one slide in a talk.
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// It studies the pT_Z spectrum at the Tevatron.
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using namespace Pythia8;
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// Generator. Process selection. Tevatron initialization. Histogram.
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pythia.readString("Beams:idB = -2212");
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pythia.readString("Beams:eCM = 1960.");
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pythia.readString("WeakSingleBoson:ffbar2gmZ = on");
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pythia.readString("PhaseSpace:mHatMin = 80.");
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pythia.readString("PhaseSpace:mHatMax = 120.");
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Hist pTZ("dN/dpTZ", 100, 0., 100.);
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// Begin event loop. Generate event. Skip if error. List first one.
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for (int iEvent = 0; iEvent < 1000; ++iEvent) {
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if (!pythia.next()) continue;
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// Loop over particles in event. Find last Z0 copy. Fill its pT.
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for (int i = 0; i < pythia.event.size(); ++i)
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if (pythia.event[i].id() == 23) iZ = i;
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pTZ.fill( pythia.event[iZ].pT() );
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// End of event loop. Statistics. Histogram. Done.