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dasu |
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// This simple program generates various signal processes for
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// MSSM bbPhi process and its backgrounds.
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// It includes the mixing of required level of pileup.
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// It then takes pythia output and runs it through very simplistic
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// detector simulation using parameterizations, including making
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// isolated light leptons, photons, composite tau, jet and b-tagged
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// jet objects.
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// It saves the output in root format for later analysis.
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using namespace std;
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#include <math.h>
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#include "Pythia.h"
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using namespace Pythia8;
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#include "UltraFastSim.h"
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int main(int argc, char **argv) {
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// Generator. Process selection. LHC initialization. Histogram.
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Pythia pythia;
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int nEvents = 0;
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int runNumber = 0;
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int meanPileupEventCount = 0;
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if(argc < 3 || argc > 5)
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{
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cerr << "Command syntax: " << argv[0] << " BBA[...]" << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " ZLL[...]" << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " TLN[...]" << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " WLN[...]" << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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exit(1);
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}
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else {
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nEvents = atoi(argv[2]);
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if(argc >= 4) runNumber = atoi(argv[3]);
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if(argc >= 5) meanPileupEventCount = atoi(argv[4]);
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if(strncmp(argv[1], "ZLL", 3) == 0)
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{
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pythia.readString("WeakSingleBoson:ffbar2gmZ = on");
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pythia.readString("PhaseSpace:mHatMin = 60.");
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pythia.readString("PhaseSpace:mHatMax = -1");
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pythia.readString("23:onMode = 0"); // Z decays to leptons only
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pythia.readString("23:onIfAny = 11 13 15");
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pythia.readString("15:onMode = 2"); // tau- decays to electrons and muons - second tau decays in all modes
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pythia.readString("15:onIfAny = 11 13");
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}
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else if(strncmp(argv[1], "WLN", 3) == 0)
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{
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pythia.readString("WeakSingleBoson:ffbar2W = on");
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pythia.readString("24:onMode = 0"); // W decays to light leptons only
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pythia.readString("24:onIfAny = 11 13");
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}
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else if(strncmp(argv[1], "TLN", 3) == 0)
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{
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pythia.readString("Top:all = on");
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pythia.readString("24:onMode = 2"); // W+ decays to light leptons only
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pythia.readString("24:onIfAny = 11 13");
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}
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else if(strncmp(argv[1], "BBA", 3) == 0)
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{
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pythia.readString("Higgs:useBSM = on");
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pythia.readString("HiggsBSM:gg2A3bbbar = on");
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pythia.readString("36:onMode = 0"); // A0(H_3) decays only to tau-pairs
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pythia.readString("36:onIfAny = 15");
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}
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else
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{
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cerr << "Unknown process type " << argv[1] << " - aborting" << endl;
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exit(1);
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}
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}
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// Initialize pythia
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pythia.init( 2212, 2212, 14000.);
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pythia.particleData.listAll();
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Rndm * rndmPtr = &pythia.rndm;
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rndmPtr->init(runNumber);
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// Pileup pythia
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Pythia pileupPythia;
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pileupPythia.readString("SoftQCD:minBias = on");
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pileupPythia.init( 2212, 2212, 14000.);
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pileupPythia.rndm.init(runNumber);
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// Ultra Fast Simulator
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UltraFastSim ufs(rndmPtr);
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// Begin event loop
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for (int iEvent = 0; iEvent < nEvents; ) {
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// Generate event. Skip if error. List first one.
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if (!pythia.next()) continue;
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// Add pileup
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int pileupEventCount = 0;
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if(meanPileupEventCount > 0) pileupEventCount = meanPileupEventCount; // * rmdmPtr->pois(); (not available yet)
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for (int puEvent = 0; puEvent < pileupEventCount; ) {
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if(!pileupPythia.next()) continue;
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for(int i = 0; i < pileupPythia.event.size(); i++) {
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Particle& particle = pileupPythia.event[i];
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if(particle.status() > 0) {
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if(particle.isVisible()) {
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if(particle.pT() > 0.5) {
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pythia.event.append(particle);
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}
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}
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}
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}
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puEvent++;
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}
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// Ultra fast simulation
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if(!ufs.run(pythia.event))
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{
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cerr << "Ultra fast simulation failed - aborting" << endl;
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exit(1);
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}
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// End of event loop. Statistics. Histogram. Done.
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if(!(iEvent % 100)) cout << "Processed event " << iEvent << endl;
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iEvent++;
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}
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// Save output
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pythia.statistics();
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pileupPythia.statistics();
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return 0;
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}
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