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