#include "AliDecayerPythia.h"
#include "AliPythia.h"
+#include "AliLog.h"
#include <TPDGCode.h>
#include <TLorentzVector.h>
#include <TClonesArray.h>
+#include <TParticle.h>
ClassImp(AliDecayerPythia)
AliDecayerPythia::AliDecayerPythia():
fPythia(AliPythia::Instance()),
fDecay(kAll),
- fHeavyFlavour(kTRUE)
+ fHeavyFlavour(kTRUE),
+ fLongLived(kFALSE),
+ fPatchOmegaDalitz(0),
+ fDecayerExodus(0),
+ fPi0(1)
{
// Default Constructor
for (Int_t i=0; i< 501; i++) fBraPart[i]= 1.;
AliDecayer(decayer),
fPythia(0),
fDecay(kAll),
- fHeavyFlavour(kTRUE)
+ fHeavyFlavour(kTRUE),
+ fLongLived(kFALSE),
+ fPatchOmegaDalitz(0),
+ fDecayerExodus(0),
+ fPi0(1)
{
// Copy Constructor
decayer.Copy(*this);
+ for (Int_t i = 0; i < 501; i++) fBraPart[i] = 0.;
}
void AliDecayerPythia::Init()
{
+
// Initialisation
//
if (!fgInit) {
}
}
//...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
-
+
+/*
if (fDecay != kNeutralPion) {
fPythia->SetMDCY(fPythia->Pycomp(111) ,1, 0);
} else {
fPythia->SetMDCY(fPythia->Pycomp(111) ,1, 1);
}
+*/
+ if (fPi0) fPythia->SetMDCY(fPythia->Pycomp(111) ,1, 1);
-
- fPythia->SetMDCY(fPythia->Pycomp(310) ,1,0);
- fPythia->SetMDCY(fPythia->Pycomp(3122),1,0);
- fPythia->SetMDCY(fPythia->Pycomp(3112),1,0);
- fPythia->SetMDCY(fPythia->Pycomp(3212),1,0);
- fPythia->SetMDCY(fPythia->Pycomp(3222),1,0);
- fPythia->SetMDCY(fPythia->Pycomp(3312),1,0);
- fPythia->SetMDCY(fPythia->Pycomp(3322),1,0);
- fPythia->SetMDCY(fPythia->Pycomp(3334),1,0);
-
+ Int_t isw = 0;
+ if (fLongLived) isw = 1;
+
+ fPythia->SetMDCY(fPythia->Pycomp(310) ,1, isw);
+ fPythia->SetMDCY(fPythia->Pycomp(3122),1, isw);
+ fPythia->SetMDCY(fPythia->Pycomp(3112),1, isw);
+// fPythia->SetMDCY(fPythia->Pycomp(3212),1, isw); // Sigma0 decays elem.
+ fPythia->SetMDCY(fPythia->Pycomp(3222),1, isw);
+ fPythia->SetMDCY(fPythia->Pycomp(3312),1, isw);
+ fPythia->SetMDCY(fPythia->Pycomp(3322),1, isw);
+ fPythia->SetMDCY(fPythia->Pycomp(3334),1, isw);
+
// .. Force decay channels
ForceDecay();
}
+void AliDecayerPythia::SwitchOffParticle(Int_t kf)
+{
+//switch off decay for particle "kf"
+fPythia->SetMDCY(fPythia->Pycomp(kf),1,0);
+}
+
void AliDecayerPythia::Decay(Int_t idpart, TLorentzVector* p)
{
// Decay a particle
//
- Float_t energy = p->Energy();
- Float_t theta = p->Theta();
- Float_t phi = p->Phi();
-
+ Float_t energy = p->Energy();
+ Float_t theta = p->Theta();
+ Float_t phi = p->Phi();
+
+ if(!fDecayerExodus) {
Lu1Ent(0, idpart, energy, theta, phi);
- fPythia->GetPrimaries();
+ } else {
+
+ // EXODUS decayer
+ if(idpart == 111){
+ fPythia->SetMDCY(fPythia->Pycomp(22) ,1, 0);
+ Lu1Ent(0, idpart, energy, theta, phi);
+ fPythia->PizeroDalitz();
+ fPythia->SetMDCY(fPythia->Pycomp(22) ,1, 1);
+ }
+ else if(idpart == 221){
+ fPythia->SetMDCY(fPythia->Pycomp(22) ,1, 0);
+ Lu1Ent(0, idpart, energy, theta, phi);
+ fPythia->EtaDalitz();
+ fPythia->SetMDCY(fPythia->Pycomp(22) ,1, 1);
+ }
+ else if(idpart == 113){
+ Lu1Ent(0, idpart, energy, theta, phi);
+ fPythia->RhoDirect();
+ }
+ else if(idpart == 223){
+ fPythia->SetMDCY(fPythia->Pycomp(111) ,1, 0);
+ Lu1Ent(0, idpart, energy, theta, phi);
+ fPythia->OmegaDirect();
+ fPythia->OmegaDalitz();
+ fPythia->SetMDCY(fPythia->Pycomp(111) ,1, 1);
+ }
+ else if(idpart == 331){
+ fPythia->SetMDCY(fPythia->Pycomp(22) ,1, 0);
+ Lu1Ent(0, idpart, energy, theta, phi);
+ fPythia->EtaprimeDalitz();
+ fPythia->SetMDCY(fPythia->Pycomp(22) ,1, 1);
+ }
+ else if(idpart == 333){
+ fPythia->SetMDCY(fPythia->Pycomp(221) ,1, 0);
+ Lu1Ent(0, idpart, energy, theta, phi);
+ fPythia->PhiDirect();
+ fPythia->PhiDalitz();
+ fPythia->SetMDCY(fPythia->Pycomp(221) ,1, 1);
+ }
+ else if(idpart == 443){
+ Lu1Ent(0, idpart, energy, theta, phi);
+ fPythia->JPsiDirect();
+ }
+ }
+
+ fPythia->GetPrimaries();
}
Int_t AliDecayerPythia::ImportParticles(TClonesArray *particles)
{
// Import the decay products
//
- return fPythia->ImportParticles(particles, "All");
+ const Float_t kconvT=0.001/2.999792458e8; // mm/c to seconds conversion
+ const Float_t kconvL=1./10; // mm to cm conversion
+ int np = fPythia->ImportParticles(particles, "All");
+ // pythia assigns decay time in mm/c, convert to seconds
+ for (int ip=1;ip<np;ip++) {
+ TParticle* prod = (TParticle*)particles->At(ip);
+ if (!prod) continue;
+ prod->SetProductionVertex(prod->Vx()*kconvL,prod->Vy()*kconvL,prod->Vz()*kconvL,kconvT*prod->T());
+ }
+ return np;
}
//
Decay_t decay=fDecay;
fPythia->SetMSTJ(21,2);
- if (decay == kNoDecayHeavy) return;
//
// select mode
ForceParticleDecay( 5232,13,1); // Sigma_b
ForceParticleDecay( 5332,13,1); // Omega_b
break;
+ case kDSemiMuonic:
+ ForceParticleDecay( 411,13,1); // D0
+ ForceParticleDecay( 421,13,1); // D+/-
+ ForceParticleDecay( 431,13,1); // D_s
+ ForceParticleDecay( 4122,13,1); // Lambda_c
+ ForceParticleDecay( 4132,13,1); // Xsi_c
+ ForceParticleDecay( 4232,13,1); // Sigma_c
+ ForceParticleDecay( 4332,13,1); // Omega_c
+ break;
case kSemiMuonic:
ForceParticleDecay( 411,13,1); // D+/-
ForceParticleDecay( 421,13,1); // D0
ForceParticleDecay(100553,13,2);// Upsilon'
ForceParticleDecay(200553,13,2);// Upsilon''
break;
+ case kJpsiDiMuon:
+ ForceParticleDecay( 443,13,2); // J/Psi
+ break;
case kBSemiElectronic:
ForceParticleDecay( 511,11,1); // B0
ForceParticleDecay( 521,11,1); // B+/-
ForceParticleDecay(100553,11,2);// Upsilon'
ForceParticleDecay(200553,11,2);// Upsilon''
break;
+ case kPsiPrimeJpsiDiElectron:
+ products[0] = 443;
+ products[1] = 211;
+ mult[0] = 1;
+ mult[1] = 2;
+ ForceParticleDecay( 100443, products, mult, 2, 1);
+ ForceParticleDecay( 443,11,2);
+ break;
case kBJpsiDiMuon:
products[0] = 443;
ForceParticleDecay( 531,443,1); // B_s
ForceParticleDecay( 5122,443,1); // Lambda_b
break;
+ case kBJpsiUndecayed:
+ ForceParticleDecay( 511,443,1); // B0
+ ForceParticleDecay( 521,443,1); // B+/-
+ ForceParticleDecay( 531,443,1); // B_s
+ ForceParticleDecay( 5122,443,1); // Lambda_b
+ fPythia->SetMDCY(fPythia->Pycomp(443),1,0); // switch-off J/psi
+ break;
case kBPsiPrimeDiElectron:
ForceParticleDecay( 511,100443,1); // B0
ForceParticleDecay( 521,100443,1); // B+/-
break;
case kOmega:
ForceOmega();
+ break;
+ case kLambda:
+ ForceLambda();
+ break;
case kAll:
break;
case kNoDecay:
case kNoDecayHeavy:
case kNeutralPion:
break;
+ case kNoDecayBeauty:
+ SwitchOffBDecay();
+ break;
+ case kElectronEM:
+ ForceParticleDecay( 111,11,1); // pi^0
+ ForceParticleDecay( 221,11,1); // eta
+ ForceParticleDecay( 113,11,1); // rho
+ ForceParticleDecay( 223,11,1); // omega
+ ForceParticleDecay( 331,11,1); // etaprime
+ ForceParticleDecay( 333,11,1); // phi
+ ForceParticleDecay( 443,11,1); // jpsi
+ break;
+ case kDiElectronEM:
+ ForceParticleDecay( 111,11,2); // pi^0
+ ForceParticleDecay( 221,11,2); // eta
+ ForceParticleDecay( 113,11,2); // rho
+ ForceParticleDecay( 223,11,2); // omega
+ ForceParticleDecay( 331,11,2); // etaprime
+ ForceParticleDecay( 333,11,2); // phi
+ ForceParticleDecay( 443,11,2); // jpsi
+ break;
+ case kGammaEM:
+ ForceParticleDecay( 111, 22, 1); // pi^0
+ ForceParticleDecay( 221, 22, 1); // eta
+ ForceParticleDecay( 113, 22, 1); // rho
+ ForceParticleDecay( 223, 22, 1); // omega
+ ForceParticleDecay( 331, 22, 1); // etaprime
+ ForceParticleDecay( 333, 22, 1); // phi
+ ForceParticleDecay( 443, 22, 1); // jpsi
+ ForceParticleDecay( 3212, 22, 1); // Sigma 0
+ ForceParticleDecay( 310, 22, 1); // K0s
+ ForceParticleDecay( 2224, 22, 1); // Delta++
+ ForceParticleDecay( 2214, 22, 1); // Delta+
+ ForceParticleDecay( 1114, 22, 1); // Delta-
+ ForceParticleDecay( 2114, 22, 1); // Delta0
+ ForceParticleDecay( 213, 22, 1); // rho+
+ ForceParticleDecay( -213, 22, 1); // rho-
+ ForceParticleDecay( 313, 22, 1); // K0star
+
+ break;
+ case kBeautyUpgrade:
+ ForceBeautyUpgrade();
+ break;
}
}
for (Int_t i = 156; i <= 160; i++) fPythia->SetMDME(i, 1, 0);
}
+void AliDecayerPythia::ForceBeautyUpgrade()
+{
+ //
+ // Force dedicated decay channels of signals ineresting
+ // for the ITS upgrade (Lb, Lc, Xi_c, B)
+ //
+
+ // Lb: 50% of them in Lc pi+ and the rest with a Lc in final state
+ if(gRandom->Rndm()<0.50) {
+ const Int_t prod3[3]={4122,211,0};
+ Int_t mult3[3]={1,1,1};
+ ForceParticleDecay(5122,prod3,mult3,3,1);
+ } else {
+ ForceParticleDecay( 5122, 4122, 1);
+ }
+ // Xi_c
+ ForceParticleDecay( 4232, 3312, 1);
+ // B+ -> D0pi+
+ const Int_t prod[2]={421,211};
+ Int_t mult[2]={1,1};
+ ForceParticleDecay(521,prod,mult,2,1);
+ // B0 -> D*-pi+
+ const Int_t prod2[2]={413,211};
+ ForceParticleDecay(511,prod2,mult,2,1);
+ // force charm hadronic decays (D mesons and Lc)
+ ForceHadronicD(0);
+}
+
void AliDecayerPythia::Lu1Ent(Int_t flag, Int_t idpart,
Double_t mom, Double_t theta, Double_t phi)
{
Int_t iDeltaPP = 2224;
Int_t productsD[2] = {kProton, kPiPlus}, multD[2] = {1, 1};
ForceParticleDecay(iDeltaPP, productsD, multD, 2);
+ // for Lambda_c -> Lambda(1520) pi+ -> p K- pi+
+ Int_t iLambda1520 = 3124;
+ Int_t productsL[2] = {kProton, kKMinus}, multL[2] = {1, 1};
+ ForceParticleDecay(iLambda1520, productsL, multL, 2);
+ // for Lambda_c -> Lambda pi+
+ Int_t iLambda=3122;
+ //for Lambda_c -> antiK0 p
+ Int_t iK0bar=-311;
Int_t decayP1[kNHadrons][4] =
};
Int_t decayP3[kNHadrons][4] =
{
- {-1 , -1 , -1 , -1},
+ {kPiPlus , iPhi , 0 , 0},
{kKMinus , kPiPlus, iRho0 , 0 },
{-1 , -1 , -1 , -1},
{-1 , -1 , -1 , -1},
{kProton , kKMinus, kPiPlus , 0}
};
+ // for Lambda_c -> Lambda_1520 pi+ -> p K- pi+, D0-> K*0 pi+ pi- -> K3pi
+ Int_t decayP4[kNHadrons][4] =
+ {
+ {iKstarbar0 , kKPlus , 0 , 0},
+ {iKstarbar0 , kPiPlus , kPiMinus, 0},
+ {-1 , -1 , -1 , -1},
+ {-1 , -1 , -1 , -1},
+ {iLambda1520 , kPiPlus , 0 , 0}
+ };
+ // for Lambda_c -> Lambda pi+
+ Int_t decayP5[kNHadrons][4] =
+ {
+ {-1 , -1 , -1 , -1},
+ {-1 , -1 , -1 , -1},
+ {-1 , -1 , -1 , -1},
+ {-1 , -1 , -1 , -1},
+ {iLambda , kPiPlus, 0 , 0}
+ };
+
+ // for Lambda_c -> K0bar p
+ Int_t decayP6[kNHadrons][4] =
+ {
+ {-1 , -1 , -1 , -1},
+ {-1 , -1 , -1 , -1},
+ {-1 , -1 , -1 , -1},
+ {-1 , -1 , -1 , -1},
+ {kProton , iK0bar, 0 , 0}
+ };
+
if(optUse4Bodies==0){
for(Int_t iDau=0;iDau<4;iDau++){
decayP2[1][iDau]=-1;
decayP3[1][iDau]=-1;
+ decayP4[1][iDau]=-1;
}
}
for (Int_t ihadron = 0; ihadron < kNHadrons; ihadron++)
{
Int_t kc = fPythia->Pycomp(hadron[ihadron]);
- fPythia->SetMDCY(kc,1,1);
Int_t ifirst = fPythia->GetMDCY(kc,2);
Int_t ilast = ifirst + fPythia->GetMDCY(kc,3)-1;
+ Double_t norm = 0.;
+ for (channel=ifirst; channel<=ilast;channel++) norm+=fPythia->GetBRAT(channel);
+ if (norm < 1.-1.e-12 || norm > 1.+1.e-12) {
+ char pName[16];
+ fPythia->Pyname(hadron[ihadron],pName);
+ AliWarning(Form("Total branching ratio of %s (PDG code = %d) not equal to 1 (= %f)",pName,hadron[ihadron],norm));
+ }
+ fBraPart[kc] = norm;
+ fPythia->SetMDCY(kc,1,1);
for (channel = ifirst; channel <= ilast; channel++) {
if ((
fPythia->GetKFDP(channel,3) == decayP3[ihadron][2] &&
fPythia->GetKFDP(channel,4) == decayP3[ihadron][3] &&
fPythia->GetKFDP(channel,5) == 0
+ ) || (
+ fPythia->GetKFDP(channel,1) == decayP4[ihadron][0] &&
+ fPythia->GetKFDP(channel,2) == decayP4[ihadron][1] &&
+ fPythia->GetKFDP(channel,3) == decayP4[ihadron][2] &&
+ fPythia->GetKFDP(channel,4) == decayP4[ihadron][3] &&
+ fPythia->GetKFDP(channel,5) == 0
+ ) || (
+ fPythia->GetKFDP(channel,1) == decayP5[ihadron][0] &&
+ fPythia->GetKFDP(channel,2) == decayP5[ihadron][1] &&
+ fPythia->GetKFDP(channel,3) == decayP5[ihadron][2] &&
+ fPythia->GetKFDP(channel,4) == decayP5[ihadron][3] &&
+ fPythia->GetKFDP(channel,5) == 0
+ ) || (
+ fPythia->GetKFDP(channel,1) == decayP6[ihadron][0] &&
+ fPythia->GetKFDP(channel,2) == decayP6[ihadron][1] &&
+ fPythia->GetKFDP(channel,3) == decayP6[ihadron][2] &&
+ fPythia->GetKFDP(channel,4) == decayP6[ihadron][3] &&
+ fPythia->GetKFDP(channel,5) == 0
+
))
{
fBraPart[kc] -= fPythia->GetBRAT(channel);
} // selected channel ?
} // decay channels
+ if (norm > 0) fBraPart[kc] /= norm;
} // hadrons
}
fPythia->SetMDCY(kc,1,1);
Int_t ifirst=fPythia->GetMDCY(kc,2);
Int_t ilast=ifirst+fPythia->GetMDCY(kc,3)-1;
- fBraPart[kc] = 1;
+ Double_t norm = 0.;
+ for (Int_t channel=ifirst; channel<=ilast;channel++){
+ norm+=fPythia->GetBRAT(channel);
+ }
+ if (norm < 1.-1.e-12 || norm > 1.+1.e-12) {
+ char pName[16];
+ fPythia->Pyname(particle,pName);
+ AliWarning(Form("Total branching ratio of %s (PDG code = %d) not equal to 1 (= %f)",pName,particle,norm));
+ }
+ fBraPart[kc] = norm;
//
// Loop over decay channels
for (Int_t channel=ifirst; channel<=ilast;channel++) {
fPythia->SetMDME(channel,1,1);
} else {
fPythia->SetMDME(channel,1,0);
- fBraPart[kc]-=fPythia->GetBRAT(channel);
+ fBraPart[kc] -= fPythia->GetBRAT(channel);
}
}
+ if (norm > 0.) fBraPart[kc] /= norm;
}
-void AliDecayerPythia::ForceParticleDecay(Int_t particle, Int_t* products, Int_t* mult, Int_t npart)
+void AliDecayerPythia::ForceParticleDecay(Int_t particle, const Int_t* products, Int_t* mult, Int_t npart, Bool_t flag)
{
//
// Force decay of particle into products with multiplicity mult
fPythia->SetMDCY(kc,1,1);
Int_t ifirst=fPythia->GetMDCY(kc,2);
Int_t ilast=ifirst+fPythia->GetMDCY(kc,3)-1;
- fBraPart[kc] = 1;
+ Double_t norm = 0.;
+ for (Int_t channel=ifirst; channel<=ilast;channel++) norm+=fPythia->GetBRAT(channel);
+ if (norm < 1.-1.e-12 || norm > 1.+1.e-12) {
+ char pName[16];
+ fPythia->Pyname(particle,pName);
+ AliWarning(Form("Total branching ratio of %s (PDG code = %d) not equal to 1 (= %f)",pName,particle,norm));
+ }
+ fBraPart[kc] = norm;
//
// Loop over decay channels
for (Int_t channel = ifirst; channel <= ilast; channel++) {
for (Int_t i = 0; i < npart; i++) {
nprod += (CountProducts(channel, products[i]) >= mult[i]);
}
- if (nprod) {
+ if ((nprod && !flag) || ((nprod == npart) && flag)) {
fPythia->SetMDME(channel,1,1);
- } else {
+ } else { //
fPythia->SetMDME(channel,1,0);
- fBraPart[kc]-=fPythia->GetBRAT(channel);
+ fBraPart[kc] -= fPythia->GetBRAT(channel);
}
}
+ if (norm > 0.) fBraPart[kc] /= norm;
+
+
+
}
void AliDecayerPythia::DefineParticles()
} // decay channels
}
+void AliDecayerPythia::ForceLambda()
+{
+ // Force Lambda -> p pi-
+ Int_t kc=fPythia->Pycomp(3122);
+ fPythia->SetMDCY(kc,1,1);
+ Int_t ifirst = fPythia->GetMDCY(kc,2);
+ Int_t ilast = ifirst + fPythia->GetMDCY(kc,3)-1;
+ for (Int_t channel = ifirst; channel <= ilast; channel++) {
+ if (
+ fPythia->GetKFDP(channel,1) == kProton &&
+ fPythia->GetKFDP(channel,2) == kPiMinus &&
+ fPythia->GetKFDP(channel,3) == 0
+ )
+ {
+ fPythia->SetMDME(channel,1,1);
+ } else {
+ fPythia->SetMDME(channel,1,0);
+ } // selected channel ?
+ } // decay channels
+}
+
+void AliDecayerPythia::SwitchOffBDecay()
+{
+// Switch off B-decays
+ Int_t heavyB[]={511,521,531,5122,5132,5232,5332};
+ for(int i=0;i<4;i++)
+ {
+ fPythia->SetMDCY(fPythia->Pycomp(heavyB[i]),1,0);
+ }
+}
Float_t AliDecayerPythia::GetPartialBranchingRatio(Int_t kf)
{
}
-#ifdef never
-void AliDecayerPythia::Streamer(TBuffer &R__b)
-{
- // Stream an object of class AliDecayerPythia.
-
- if (R__b.IsReading()) {
- Version_t R__v = R__b.ReadVersion(); if (R__v) { }
- AliDecayer::Streamer(R__b);
- (AliPythia::Instance())->Streamer(R__b);
- R__b >> (Int_t&)fDecay;
- R__b.ReadStaticArray(fBraPart);
- } else {
- R__b.WriteVersion(AliDecayerPythia::IsA());
- AliDecayer::Streamer(R__b);
- R__b << fPythia;
- R__b << (Int_t)fDecay;
- R__b.WriteArray(fBraPart, 501);
- }
-}
-#endif
-
void AliDecayerPythia::Copy(TObject &) const
{
//
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff