IlcGenerator* MbPythia()
{
comment = comment.Append(" pp at 14 TeV: Pythia low-pt");
//
// Pythia
IlcGenPythia* pythia = new IlcGenPythia(-1);
pythia->SetMomentumRange(0, 999999.);
pythia->SetThetaRange(0., 180.);
pythia->SetYRange(-12.,12.);
pythia->SetPtRange(0,1000.);
pythia->SetProcess(kPyMb);
pythia->SetEnergyCMS(energy);
return pythia;
}
void fastGen(Int_t nev = 1, char* filename = "gilc.root")
{
IlcPDG::AddParticlesToPdgDataBase();
TDatabasePDG::Instance();
// Run loader
IlcRunLoader* rl = IlcRunLoader::Open("gilc.root","FASTRUN","recreate");
rl->SetCompressionLevel(2);
rl->SetNumberOfEventsPerFile(nev);
rl->LoadKinematics("RECREATE");
rl->MakeTree("E");
gIlc->SetRunLoader(rl);
// Create stack
rl->MakeStack();
IlcStack* stack = rl->Stack();
// Header
IlcHeader* header = rl->GetHeader();
// Create and Initialize Generator
// Example of charm generation taken from Config_PythiaHeavyFlavours.C
IlcGenPythia *gener = new IlcGenPythia(-1);
gener->SetEnergyCMS(14000.);
gener->SetMomentumRange(0,999999);
gener->SetPhiRange(0., 360.);
gener->SetThetaRange(0.,180.);
// gener->SetProcess(kPyCharmppMNR); // Correct Pt distribution, wrong mult
gener->SetProcess(kPyMb); // Correct multiplicity, wrong Pt
gener->SetStrucFunc(kCTEQ4L);
gener->SetPtHard(2.1,-1.0);
gener->SetFeedDownHigherFamily(kFALSE);
gener->SetStack(stack);
gener->Init();
// Go to gilc.root
rl->CdGAFile();
// Forbid some decays. Do it after gener->Init(0, because
// the initialization of the generator includes reading of the decay table.
IlcPythia * py= IlcPythia::Instance();
py->SetMDME(737,1,0); //forbid D*+->D+ + pi0
py->SetMDME(738,1,0);//forbid D*+->D+ + gamma
// Forbid all D0 decays except D0->K- pi+
for(Int_t d=747; d<=762; d++){
py->SetMDME(d,1,0);
}
// decay 763 is D0->K- pi+
for(Int_t d=764; d<=807; d++){
py->SetMDME(d,1,0);
}
//
// Event Loop
//
TStopwatch timer;
timer.Start();
for (Int_t iev = 0; iev < nev; iev++) {
cout <<"Event number "<< iev << endl;
// Initialize event
header->Reset(0,iev);
rl->SetEventNumber(iev);
stack->Reset();
rl->MakeTree("K");
// Generate event
Int_t nprim = 0;
Int_t ntrial = 0;
Int_t ndstar = 0;
//-------------------------------------------------------------------------------------
while(!ndstar) {
// Selection of events with D*
stack->Reset();
stack->ConnectTree(rl->TreeK());
gener->Generate();
ntrial++;
nprim = stack->GetNprimary();
for(Int_t ipart =0; ipart < nprim; ipart++){
TParticle * part = stack->Particle(ipart);
if(part) {
if (TMath::Abs(part->GetPdgCode())== 413) {
TArrayI daughtersId;
GetFinalDecayProducts(ipart,*stack,daughtersId);
Bool_t kineOK = kTRUE;
Double_t thetaMin = TMath::Pi()/4;
Double_t thetaMax = 3*TMath::Pi()/4;
for (Int_t id=1; id<=daughtersId[0]; id++) {
TParticle * daughter = stack->Particle(daughtersId[id]);
if (!daughter) {
kineOK = kFALSE;
break;
}
Double_t theta = daughter->Theta();
if (theta<thetaMin || theta>thetaMax) {
kineOK = kFALSE;
break;
}
}
if (!kineOK) continue;
part->Print();
ndstar++;
}
}
}
}
cout << "Number of particles " << nprim << endl;
cout << "Number of trials " << ntrial << endl;
// Finish event
header->SetNprimary(stack->GetNprimary());
header->SetNtrack(stack->GetNtrack());
// I/O
stack->FinishEvent();
header->SetStack(stack);
rl->TreeE()->Fill();
rl->WriteKinematics("OVERWRITE");
} // event loop
timer.Stop();
timer.Print();
// Termination
// Generator
gener->FinishRun();
// Write file
rl->WriteHeader("OVERWRITE");
gener->Write();
rl->Write();
}
void fastGen(Int_t nev = 1, char* filename = "gilc.root")
{
// Run loader
IlcRunLoader* rl = IlcRunLoader::Open("gilc.root","FASTRUN","recreate");
rl->SetCompressionLevel(2);
rl->SetNumberOfEventsPerFile(nev);
rl->LoadKinematics("RECREATE");
rl->MakeTree("E");
gIlc->SetRunLoader(rl);
// Create stack
rl->MakeStack();
IlcStack* stack = rl->Stack();
// Header
IlcHeader* header = rl->GetHeader();
// Generator
IlcGenPythia *gener = new IlcGenPythia(-1);
gener->SetMomentumRange(0,999999);
gener->SetProcess(kPyMb);
gener->SetEnergyCMS(14000.);
gener->SetThetaRange(45, 135);
gener->SetPtRange(0., 1000.);
gener->SetStack(stack);
gener->Init();
rl->CdGAFile();
//
// Event Loop
//
for (Int_t iev = 0; iev < nev; iev++) {
// Initialize event
header->Reset(0,iev);
rl->SetEventNumber(iev);
stack->Reset();
rl->MakeTree("K");
// Generate event
Int_t nprim = 0;
Int_t ntrial = 0;
Int_t minmult = 1000;
while(nprim<minmult) {
// Selection of events with multiplicity
// bigger than "minmult"
stack->Reset();
gener->Generate();
ntrial++;
nprim = stack->GetNprimary();
}
cout << "Number of particles " << nprim << endl;
cout << "Number of trials " << ntrial << endl;
// Finish event
header->SetNprimary(stack->GetNprimary());
header->SetNtrack(stack->GetNtrack());
// I/O
stack->FinishEvent();
header->SetStack(stack);
rl->TreeE()->Fill();
rl->WriteKinematics("OVERWRITE");
} // event loop
// Termination
// Generator
gener->FinishRun();
// Stack
stack->FinishRun();
// Write file
rl->WriteHeader("OVERWRITE");
gener->Write();
rl->Write();
}