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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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#include "UFSDataStore.h"
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int poisson(double mean, Rndm *rndmPtr) {
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static double oldMean = -1;
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static double g;
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if(mean != oldMean) {
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oldMean = mean;
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if(mean == 0) {
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g = 0;
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}
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else {
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g = exp(-mean);
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}
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}
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double em = -1;
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double t = 1;
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do {
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em++;
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t *= rndmPtr->flat();
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} while(t > g);
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return em;
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}
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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] << " ZHmmbb[...]" << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " ZHeebb[...]" << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " ZZmmbb[...]" << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " BBHmh[...] " << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " BBAmh[...] " << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " Zee[...] " << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " Zmm[...] " << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " Zeh[...] " << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " Zmh[...] " << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " Zhh[...] " << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " Wen[...] " << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " Wmn[...] " << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " Ten[...] " << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "or " << argv[0] << " Tmn[...] " << " <nEvents> [RandomSeed] [meanPileupEventCount]" << endl;
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cerr << "In above e-electron, m-muon, h-hadronic tau. n-neutrino" << 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], "Zee", 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 electrons only
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pythia.readString("23:onIfAny = 11");
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}
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else if(strncmp(argv[1], "Zmm", 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 muons only
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pythia.readString("23:onIfAny = 13");
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}
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else if(strncmp(argv[1], "Zeh", 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 taus only
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pythia.readString("23:onIfAny = 15");
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pythia.readString("15:onMode = 2"); // tau- decays to electrons - second tau decays in all modes
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pythia.readString("15:onIfAny = 11");
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}
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else if(strncmp(argv[1], "Zmh", 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 taus only
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pythia.readString("23:onIfAny = 15");
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pythia.readString("15:onMode = 2"); // tau- decays to muons - second tau decays in all modes
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pythia.readString("15:onIfAny = 13");
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}
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else if(strncmp(argv[1], "Zhh", 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 taus only
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pythia.readString("23:onIfAny = 15");
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}
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else if(strncmp(argv[1], "Wen", 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 electron
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pythia.readString("24:onIfAny = 11");
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}
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else if(strncmp(argv[1], "Wmn", 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 muon
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pythia.readString("24:onIfAny = 13");
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}
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else if(strncmp(argv[1], "Ten", 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 electron
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pythia.readString("24:onIfAny = 11");
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}
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else if(strncmp(argv[1], "Tmn", 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 muon
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pythia.readString("24:onIfAny = 13");
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}
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else if(strncmp(argv[1], "ZHmmbb", 6) == 0)
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{
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pythia.readString("HiggsSM:ffbar2HZ = on");
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pythia.readString("25:m0 = 120");
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pythia.readString("25:onMode = 0"); // Higgs decays to bbBar only
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pythia.readString("25:onIfAny = 5");
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pythia.readString("23:onMode = 0"); // Z decays to mu+,mu- only (for trigger)
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pythia.readString("23:onIfAny = 13");
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}
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else if(strncmp(argv[1], "ZHeebb", 6) == 0)
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{
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pythia.readString("HiggsSM:ffbar2HZ = on");
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pythia.readString("25:m0 = 120");
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pythia.readString("25:onMode = 0"); // Higgs decays to bbBar only
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pythia.readString("25:onIfAny = 5");
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pythia.readString("23:onMode = 0"); // Z decays to e+,e- only (for trigger)
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pythia.readString("23:onIfAny = 11");
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}
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else if(strncmp(argv[1], "BB", 2) == 0)
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{
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pythia.readString("Higgs:useBSM = on");
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pythia.readString("25:m0 = 129");
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pythia.readString("35:m0 = 499.7");
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pythia.readString("36:m0 = 500");
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pythia.readString("37:m0 = 506");
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pythia.readString("HiggsHchg:tanBeta = 30");
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if(strncmp(argv[1], "BBH", 3) == 0) {
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pythia.readString("HiggsBSM:gg2H2bbbar = on");
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pythia.readString("35:onMode = 0"); // H2(H_2) decays only to tau-pairs
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pythia.readString("35:onIfAny = 15");
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}
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else {
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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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if(strncmp(argv[1], "BBHmh", 5) == 0 ||
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strncmp(argv[1], "BBAmh", 5) == 0) {
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pythia.readString("15:onMode = 2"); // tau- decays to muons - second tau decays in all modes
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pythia.readString("15:onIfAny = 13");
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}
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}
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else if(strncmp(argv[1], "ZZmmbb", 6) == 0)
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{
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pythia.readString("WeakDoubleBoson:ffbar2gmZgmZ = on");
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pythia.readString("23:onMode = 0");
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pythia.readString("23:onIfAny = 5 13"); // Let the Z decay to bQuarks or muons
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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;
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char jobName[256];
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sprintf(jobName, "%s-PU%3.3d-%4.4d", argv[1], meanPileupEventCount, runNumber);
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UFSDataStore dataStore(jobName, &ufs);
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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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if(iEvent < 10) pythia.event.list();
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// Add pileup
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int pileupEventCount = 0;
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if(meanPileupEventCount > 0) pileupEventCount = poisson(meanPileupEventCount, rndmPtr);
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for (int puEvent = 0; puEvent < pileupEventCount; ) {
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if(!pileupPythia.next()) continue;
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double vx = rndmPtr->gauss()*2.; // Mean beam spread is 2 mm in x-y and 75 mm in z
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double vy = rndmPtr->gauss()*2.;
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double vz = rndmPtr->gauss()*75.;
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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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particle.xProd(vx+particle.xProd());
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particle.yProd(vy+particle.yProd());
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particle.zProd(vz+particle.zProd());
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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, rndmPtr))
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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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// Store data
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if(!dataStore.run())
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{
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cerr << "Failed to store data" << endl;
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exit(3);
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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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