X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=EVGEN%2FAliGenMUONCocktail.cxx;h=89fe4de562b6fd9a6fb432be1040a52418734fc7;hb=2e13c33bc0e8cefb9c7431c0faa920f1cfc9cd11;hp=4fbe764e27dc78d6bb0ec254eb6dfa8a3dc8b708;hpb=88e5db438d136a52020afa73aed7ee0fa5d70417;p=u%2Fmrichter%2FAliRoot.git diff --git a/EVGEN/AliGenMUONCocktail.cxx b/EVGEN/AliGenMUONCocktail.cxx index 4fbe764e27d..89fe4de562b 100644 --- a/EVGEN/AliGenMUONCocktail.cxx +++ b/EVGEN/AliGenMUONCocktail.cxx @@ -18,105 +18,146 @@ // // Classe to create the MUON coktail for physics in the Alice muon spectrometer // The followoing muons sources are included in this cocktail: -// jpsi, upsilon, non-correlated open and beauty, and muons from pion and kaons. +// jpsi, upsilon, non-correlated open and beauty. // The free parameeters are : // pp reaction cross-section // production cross-sections in pp collisions and -// branching ratios in the muon channel -// Hard probes are supposed to scale with Ncoll and hadronic production with (0.8Ncoll+0.2*Npart) -// There is a primordial trigger wiche requires : +// branching ratios in the muon channel and shadowing +// Hard probes are supposed to scale with Ncoll and hadronic muon production with (0.8Ncoll+0.2*Npart) +// There is a primordial trigger which requires : // a minimum muon multiplicity above a pT cut in a theta acceptance cone // -// Gines Martinez, jan 2004, Nantes martinez@in2p3.fr - -// - -//#include #include -#include #include +#include -#include "AliGenParam.h" -#include "AliGenMUONlib.h" -#include "AliGenMUONCocktail.h" #include "AliGenCocktailEntry.h" -#include "AliCollisionGeometry.h" -#include "AliRun.h" +#include "AliGenMUONCocktail.h" +#include "AliGenMUONlib.h" +#include "AliFastGlauber.h" +#include "AliGenParam.h" #include "AliMC.h" +#include "AliRun.h" #include "AliStack.h" +#include "AliLog.h" ClassImp(AliGenMUONCocktail) //________________________________________________________________________ AliGenMUONCocktail::AliGenMUONCocktail() - :AliGenCocktail() + :AliGenCocktail(), + fFastGlauber (0x0), + fTotalRate(0), + fMuonMultiplicity(1), + fMuonPtCut(1.), + fMuonThetaMinCut(171.), + fMuonThetaMaxCut(178.), + fNSucceded(0), + fNGenerated(0), + fLowImpactParameter(0.), + fHighImpactParameter(5.), + fAverageImpactParameter(0.), + fNumberOfCollisions(0.), + fNumberOfParticipants(0.), + fHadronicMuons(kTRUE), + fInvMassCut (kFALSE), + fInvMassMinCut (0.), + fInvMassMaxCut (100.) { // Constructor - fTotalRate =0; - fNSucceded=0; - fNGenerated=0; - fMuonMultiplicity=1; - fMuonPtCut= 1.; - fMuonThetaMinCut=171.; - fMuonThetaMaxCut=178.; - fNumberOfCollisions = 400; // Minimum bias Pb+Pb collisions - // -} -//_________________________________________________________________________ -AliGenMUONCocktail::AliGenMUONCocktail(const AliGenMUONCocktail & cocktail): - AliGenCocktail(cocktail) -{ -// Copy constructor - fTotalRate =0; - fNSucceded=0; - fNGenerated=0; - fMuonMultiplicity=1; - fMuonPtCut= 1.; - fMuonThetaMinCut=171.; - fMuonThetaMaxCut=178.; - fNumberOfCollisions = 400; // Minimum bias Pb+Pb collisions - // } //_________________________________________________________________________ AliGenMUONCocktail::~AliGenMUONCocktail() { // Destructor - delete fEntries; + if (fFastGlauber) delete fFastGlauber; } //_________________________________________________________________________ void AliGenMUONCocktail::Init() { - // Defining MUON physics cocktail + // NN cross section + Double_t sigmaReaction = 0.072; // MinBias NN cross section for PbPb LHC energies http://arxiv.org/pdf/nucl-ex/0302016 + + // Initialising Fast Glauber object + fFastGlauber = AliFastGlauber::Instance(); + fFastGlauber->SetPbPbLHC(); + fFastGlauber->SetNNCrossSection(sigmaReaction*1000.); //Expected NN cross-section in mb at LHC with diffractive part http://arxiv.org/pdf/nucl-ex/0302016 ) + fFastGlauber->Init(1); + + // Calculating average number of collisions + Int_t ib=0; + Int_t ibmax=10000; + Double_t b = 0.; + fAverageImpactParameter=0.; + fNumberOfCollisions = 0.; + fNumberOfParticipants = 0.; + for(ib=0; ibGetRandomImpactParameter(fLowImpactParameter,fHighImpactParameter); + fAverageImpactParameter+=b; + fNumberOfCollisions += fFastGlauber->GetNumberOfCollisions( b )/(1.-TMath::Exp(-fFastGlauber->GetNumberOfCollisions(b))); + fNumberOfParticipants += fFastGlauber->GetNumberOfParticipants( b ); + } + fAverageImpactParameter/= ((Double_t) ibmax); + fNumberOfCollisions /= ((Double_t) ibmax); + fNumberOfParticipants /= ((Double_t) ibmax);; + AliInfo(Form("=%4.2f, =%5.1f and and =%5.1f",b, fNumberOfCollisions, fNumberOfParticipants)); + + // Estimating shadowing on charm a beaty production + // ----------------------------------------------------- + // Extrapolation of the cross sections from $p-p$ to \mbox{Pb--Pb} + // interactions + // is done by means of the Glauber model. For the impact parameter dependence + // of the shadowing factor we use a simple formula: + // $C_{sh}(b) = C_{sh}(0) + (1 - C_{sh}(0))(b/16~fm)4$, + // motivated by the theoretical predictions (see e.g. + // V. Emelyanov et al., Phys. Rev. C61, 044904 (2000)) and HIJING + // simulations showing an almost flat behaviour + // up to 10~$fm$ and a rapid increase to 1 for larger impact parameters. + // C_{sh}(0) = 0.60 for Psi and 0.76 for Upsilon (Smba communication). + // for open charm and beauty is 0.65 and 0.84 + // ----------------------------------------------------- + Double_t charmshadowing = 0.65 + (1.0-0.65)*TMath::Power(fAverageImpactParameter/16.,4); + Double_t beautyshadowing = 0.84 + (1.0-0.84)*TMath::Power(fAverageImpactParameter/16.,4); + Double_t charmoniumshadowing = 0.60 + (1.0-0.60)*TMath::Power(fAverageImpactParameter/16.,4); + Double_t beautoniumshadowing = 0.76 + (1.0-0.76)*TMath::Power(fAverageImpactParameter/16.,4); + if (fAverageImpactParameter>16.) { + charmoniumshadowing = 1.0; + beautoniumshadowing = 1.0; + charmshadowing = 1.0; + beautyshadowing= 1.0; + } + AliInfo(Form("Shadowing for charmonium and beautonium production are %4.2f and %4.2f respectively",charmoniumshadowing,beautoniumshadowing)); + AliInfo(Form("Shadowing for charm and beauty production are %4.2f and %4.2f respectively",charmshadowing,beautyshadowing)); + // Defining MUON physics cocktail // Kinematical limits for particle generation - Float_t ptMin = fPtMin; - Float_t ptMax = fPtMax; - Float_t yMin = fYMin;; - Float_t yMax = fYMax;; - Float_t phiMin = fPhiMin*180./TMath::Pi(); - Float_t phiMax = fPhiMax*180./TMath::Pi(); - printf(">>> Kinematical range pT:%f:%f y:%f:%f Phi:%f:%f\n",ptMin,ptMax,yMin,yMax,phiMin,phiMax); - - Float_t sigmaReaction = 0.072; // MINB pp at LHC energies 72 mb - - // Generating J/Psi Physics - AliGenParam * genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, "Vogt", "Jpsi"); - // 4pi Generation - genjpsi->SetPtRange(0,100.); + Double_t ptMin = fPtMin; + Double_t ptMax = fPtMax; + Double_t yMin = fYMin;; + Double_t yMax = fYMax;; + Double_t phiMin = fPhiMin*180./TMath::Pi(); + Double_t phiMax = fPhiMax*180./TMath::Pi(); + AliInfo(Form("Ranges pT:%4.1f : %4.1f GeV/c, y:%4.2f : %4.2f, Phi:%5.1f : %5.1f degres",ptMin,ptMax,yMin,yMax,phiMin,phiMax)); + + // Generating J/Psi Physics + // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf ) + AliGenParam * genjpsi = new AliGenParam(1, AliGenMUONlib::kJpsi, "CDF scaled", "Jpsi"); + genjpsi->SetPtRange(0,100.); // 4pi generation genjpsi->SetYRange(-8.,8); genjpsi->SetPhiRange(0.,360.); genjpsi->SetForceDecay(kDiMuon); genjpsi->SetTrackingFlag(1); - // Calculation of the paritcle multiplicity per event in the muonic channel - Float_t ratiojpsi; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail - Float_t sigmajpsi = 31.0e-6 * 0.437; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing - Float_t brjpsi = 0.0588; // Branching Ratio for JPsi + // Calculation of the particle multiplicity per event in the muonic channel + Double_t ratiojpsi; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail + Double_t sigmajpsi = 31.0e-6 * charmoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing + Double_t brjpsi = 0.0588; // Branching Ratio for JPsi PDG PRC15 (200) genjpsi->Init(); // Generating pT and Y parametrsation for the 4pi ratiojpsi = sigmajpsi * brjpsi * fNumberOfCollisions / sigmaReaction * genjpsi->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); - printf(">>> ratio jpsi %g et %g Ncol %g sigma %g\n",ratiojpsi,genjpsi->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax),fNumberOfCollisions, sigmajpsi ); + AliInfo(Form("Jpsi production cross-section in pp with shadowing %5.3g barns",sigmajpsi)); + AliInfo(Form("Jpsi production probability per collisions in acceptance via the muonic channel %5.3g",ratiojpsi)); // Generation in the kinematical limits of AliGenMUONCocktail genjpsi->SetPtRange(ptMin, ptMax); genjpsi->SetYRange(yMin, yMax); @@ -127,20 +168,21 @@ void AliGenMUONCocktail::Init() fTotalRate+=ratiojpsi; // Generating Psi prime Physics - AliGenParam * genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, "Vogt", "PsiP"); - // 4pi Generation - genpsiP->SetPtRange(0,100.); + // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf ) + AliGenParam * genpsiP = new AliGenParam(1, AliGenMUONlib::kPsiP, "CDF scaled", "PsiP"); + genpsiP->SetPtRange(0,100.);// 4pi generation genpsiP->SetYRange(-8.,8); genpsiP->SetPhiRange(0.,360.); genpsiP->SetForceDecay(kDiMuon); genpsiP->SetTrackingFlag(1); // Calculation of the paritcle multiplicity per event in the muonic channel - Float_t ratiopsiP; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail - Float_t sigmapsiP = 4.68e-6 * 0.437; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing - Float_t brpsiP = 0.0103; // Branching Ratio for PsiP + Double_t ratiopsiP; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail + Double_t sigmapsiP = 4.68e-6 * charmoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing + Double_t brpsiP = 0.0103; // Branching Ratio for PsiP genpsiP->Init(); // Generating pT and Y parametrsation for the 4pi ratiopsiP = sigmapsiP * brpsiP * fNumberOfCollisions / sigmaReaction * genpsiP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); - printf(">>> ratio psiP %g et %g Ncol %g sigma %g\n",ratiopsiP,genpsiP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax),fNumberOfCollisions, sigmapsiP ); + AliInfo(Form("Psi prime production cross-section in pp with shadowing %5.3g barns",sigmapsiP)); + AliInfo(Form("Psi prime production probability per collisions in acceptance via the muonic channel %5.3g",ratiopsiP)); // Generation in the kinematical limits of AliGenMUONCocktail genpsiP->SetPtRange(ptMin, ptMax); genpsiP->SetYRange(yMin, yMax); @@ -150,20 +192,21 @@ void AliGenMUONCocktail::Init() AddGenerator(genpsiP, "PsiP", ratiopsiP); fTotalRate+=ratiopsiP; - -// Generating Upsilon Physics - AliGenParam * genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, "Vogt", "Upsilon"); + // Generating Upsilon Physics + // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf ) + AliGenParam * genupsilon = new AliGenParam(1, AliGenMUONlib::kUpsilon, "CDF scaled", "Upsilon"); genupsilon->SetPtRange(0,100.); genupsilon->SetYRange(-8.,8); genupsilon->SetPhiRange(0.,360.); genupsilon->SetForceDecay(kDiMuon); genupsilon->SetTrackingFlag(1); - Float_t ratioupsilon; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail - Float_t sigmaupsilon = 0.501e-6 * 0.674; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing - Float_t brupsilon = 0.0248; // Branching Ratio for Upsilon + Double_t ratioupsilon; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail + Double_t sigmaupsilon = 0.501e-6 * beautoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing + Double_t brupsilon = 0.0248; // Branching Ratio for Upsilon genupsilon->Init(); // Generating pT and Y parametrsation for the 4pi ratioupsilon = sigmaupsilon * brupsilon * fNumberOfCollisions / sigmaReaction * genupsilon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); - printf(">>> ratio upsilon %g et %g\n",ratioupsilon, genupsilon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax)); + AliInfo(Form("Upsilon 1S production cross-section in pp with shadowing %5.3g barns",sigmaupsilon)); + AliInfo(Form("Upsilon 1S production probability per collisions in acceptance via the muonic channel %5.3g",ratioupsilon)); genupsilon->SetPtRange(ptMin, ptMax); genupsilon->SetYRange(yMin, yMax); genupsilon->SetPhiRange(phiMin, phiMax); @@ -171,19 +214,21 @@ void AliGenMUONCocktail::Init() AddGenerator(genupsilon,"Upsilon", ratioupsilon); fTotalRate+=ratioupsilon; -// Generating UpsilonP Physics - AliGenParam * genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, "Vogt", "UpsilonP"); + // Generating UpsilonP Physics + // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf ) + AliGenParam * genupsilonP = new AliGenParam(1, AliGenMUONlib::kUpsilonP, "CDF Scaled", "UpsilonP"); genupsilonP->SetPtRange(0,100.); genupsilonP->SetYRange(-8.,8); genupsilonP->SetPhiRange(0.,360.); genupsilonP->SetForceDecay(kDiMuon); genupsilonP->SetTrackingFlag(1); - Float_t ratioupsilonP; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail - Float_t sigmaupsilonP = 0.246e-6 * 0.674; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing - Float_t brupsilonP = 0.0131; // Branching Ratio for UpsilonP + Double_t ratioupsilonP; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail + Double_t sigmaupsilonP = 0.246e-6 * beautoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing + Double_t brupsilonP = 0.0131; // Branching Ratio for UpsilonP genupsilonP->Init(); // Generating pT and Y parametrsation for the 4pi ratioupsilonP = sigmaupsilonP * brupsilonP * fNumberOfCollisions / sigmaReaction * genupsilonP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); - printf(">>> ratio upsilonP %g et %g\n",ratioupsilonP, genupsilonP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax)); + AliInfo(Form("Upsilon 2S production cross-section in pp with shadowing %5.3g barns",sigmaupsilonP)); + AliInfo(Form("Upsilon 2S production probability per collisions in acceptance via the muonic channel %5.3g",ratioupsilonP)); genupsilonP->SetPtRange(ptMin, ptMax); genupsilonP->SetYRange(yMin, yMax); genupsilonP->SetPhiRange(phiMin, phiMax); @@ -191,20 +236,21 @@ void AliGenMUONCocktail::Init() AddGenerator(genupsilonP,"UpsilonP", ratioupsilonP); fTotalRate+=ratioupsilonP; - -// Generating UpsilonPP Physics - AliGenParam * genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, "Vogt", "UpsilonPP"); + // Generating UpsilonPP Physics + // Using CFD scaled distribution (see http://clrwww.in2p3.fr/DIMUON2004/talks/sgrigoryan.pdf ) + AliGenParam * genupsilonPP = new AliGenParam(1, AliGenMUONlib::kUpsilonPP, "CDF Scaled", "UpsilonPP"); genupsilonPP->SetPtRange(0,100.); genupsilonPP->SetYRange(-8.,8); genupsilonPP->SetPhiRange(0.,360.); genupsilonPP->SetForceDecay(kDiMuon); genupsilonPP->SetTrackingFlag(1); - Float_t ratioupsilonPP; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail - Float_t sigmaupsilonPP = 0.100e-6 * 0.674; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing - Float_t brupsilonPP = 0.0181; // Branching Ratio for UpsilonPP + Double_t ratioupsilonPP; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail + Double_t sigmaupsilonPP = 0.100e-6 * beautoniumshadowing; // section "6.7 Quarkonia Production" table 6.5 for pp times shadowing + Double_t brupsilonPP = 0.0181; // Branching Ratio for UpsilonPP genupsilonPP->Init(); // Generating pT and Y parametrsation for the 4pi ratioupsilonPP = sigmaupsilonPP * brupsilonPP * fNumberOfCollisions / sigmaReaction * genupsilonPP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); - printf(">>> ratio upsilonPP %g et %g\n",ratioupsilonPP, genupsilonPP->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax)); + AliInfo(Form("Upsilon 3S production cross-section in pp with shadowing %5.3g barns",sigmaupsilonPP)); + AliInfo(Form("Upsilon 3S production probability per collisions in acceptance via the muonic channel %5.3g",ratioupsilonPP)); genupsilonPP->SetPtRange(ptMin, ptMax); genupsilonPP->SetYRange(yMin, yMax); genupsilonPP->SetPhiRange(phiMin, phiMax); @@ -212,90 +258,102 @@ void AliGenMUONCocktail::Init() AddGenerator(genupsilonPP,"UpsilonPP", ratioupsilonPP); fTotalRate+=ratioupsilonPP; - -// Generating Charm Physics - AliGenParam * gencharm = new AliGenParam(1, AliGenMUONlib::kCharm, "Vogt", "Charm"); +// Generating non-correlated Charm Physics + AliGenParam * gencharm = new AliGenParam(1, AliGenMUONlib::kCharm, "pp", "Charm"); gencharm->SetPtRange(0,100.); gencharm->SetYRange(-8.,8); gencharm->SetPhiRange(0.,360.); gencharm->SetForceDecay(kSemiMuonic); gencharm->SetTrackingFlag(1); - Float_t ratiocharm; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail - Float_t sigmacharm = 2. * 6.64e-3 * 0.65 ; // - Float_t brcharm = 0.12; // Branching Ratio for Charm + Double_t ratiocharm; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail + Double_t sigmacharm = 2. * 6.64e-3 * charmshadowing ; // + Double_t brcharm = 0.12; // Branching Ratio for Charm gencharm->Init(); // Generating pT and Y parametrsation for the 4pi - ratiocharm = sigmacharm * brcharm * fNumberOfCollisions / sigmaReaction * - gencharm->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); + ratiocharm = sigmacharm * brcharm * fNumberOfCollisions / sigmaReaction * gencharm->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); + AliInfo(Form("Charm production cross-section in pp with shadowing %5.3g barns",sigmacharm)); + AliInfo(Form("Charm production probability per collisions in acceptance via the semi-muonic channel %5.3g",ratiocharm)); gencharm->SetPtRange(ptMin, ptMax); gencharm->SetYRange(yMin, yMax); gencharm->SetPhiRange(phiMin, phiMax); gencharm->Init(); // Generating pT and Y parametrsation in the desired kinematic range - - printf(">>> ratio charm %f\n",ratiocharm); AddGenerator(gencharm,"Charm", ratiocharm); fTotalRate+=ratiocharm; -// Generating Beauty Physics "Correlated Pairs" - AliGenParam * genbeauty = new AliGenParam(2, AliGenMUONlib::kBeauty, "Vogt", "Beauty"); +// Generating non-correlated Beauty Physics + AliGenParam * genbeauty = new AliGenParam(1, AliGenMUONlib::kBeauty, "pp", "Beauty"); genbeauty->SetPtRange(0,100.); genbeauty->SetYRange(-8.,8); genbeauty->SetPhiRange(0.,360.); genbeauty->SetForceDecay(kSemiMuonic); genbeauty->SetTrackingFlag(1); - Float_t ratiobeauty; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail - Float_t sigmabeauty = 2. * 0.210e-3 * 0.84; // - Float_t brbeauty = 0.15; // Branching Ratio for Beauty + Double_t ratiobeauty; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail + Double_t sigmabeauty = 2. * 0.210e-3 * beautyshadowing; // + Double_t brbeauty = 0.15; // Branching Ratio for Beauty genbeauty->Init(); // Generating pT and Y parametrsation for the 4pi ratiobeauty = sigmabeauty * brbeauty * fNumberOfCollisions / sigmaReaction * genbeauty->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); + AliInfo(Form("Beauty production cross-section in pp with shadowing %5.3g barns",sigmabeauty)); + AliInfo(Form("Beauty production probability per collisions in acceptance via the semi-muonic channel %5.3g",ratiobeauty)); genbeauty->SetPtRange(ptMin, ptMax); genbeauty->SetYRange(yMin, yMax); genbeauty->SetPhiRange(phiMin, phiMax); genbeauty->Init(); // Generating pT and Y parametrisation in the desired kinematic range - - printf(">>> ratio beauty %f\n",ratiobeauty); AddGenerator(genbeauty,"Beauty", ratiobeauty); fTotalRate+=ratiobeauty; -// Generating Pion Physics - AliGenParam * genpion = new AliGenParam(1, AliGenMUONlib::kPion, "Vogt", "Pion"); - genpion->SetPtRange(0,100.); - genpion->SetYRange(-8.,8); - genpion->SetPhiRange(0.,360.); - genpion->SetForceDecay(kPiToMu); - genpion->SetTrackingFlag(1); - Float_t ratiopion; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail - Float_t sigmapion = 0.93e-2; // Valerie presentation Clermont-16-jan-2004 and Alice-int-2002-06 - Float_t brpion = 0.9999; // Branching Ratio for Pion - genpion->Init(); // Generating pT and Y parametrsation for the 4pi - ratiopion = sigmapion * brpion * (0.80*fNumberOfParticipants+0.2*fNumberOfCollisions) / sigmaReaction * genpion->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); - genpion->SetPtRange(ptMin, ptMax); - genpion->SetYRange(yMin, yMax); - genpion->SetPhiRange(phiMin, phiMax); - genpion->Init(); // Generating pT and Y parametrsation in the desired kinematic range - printf(">>> ratio pion %f\n",ratiopion); - AddGenerator(genpion,"Pion", ratiopion); - fTotalRate+=ratiopion; - -// Generating Kaon Physics - AliGenParam * genkaon = new AliGenParam(1, AliGenMUONlib::kKaon, "Vogt", "Kaon"); - genkaon->SetPtRange(0,100.); - genkaon->SetYRange(-8.,8); - genkaon->SetPhiRange(0.,360.); - genkaon->SetForceDecay(kKaToMu); - genkaon->SetTrackingFlag(1); - Float_t ratiokaon; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail - Float_t sigmakaon = 1.23e-4; // Valerie presentation Clermont-16-jan-2004 and Alice-int-2002-06 - Float_t brkaon = 0.6351 ; // Branching Ratio for Kaon - genkaon->Init(); // Generating pT and Y parametrsation for the 4pi - ratiokaon = sigmakaon * brkaon * (0.80*fNumberOfParticipants+0.2*fNumberOfCollisions)/ sigmaReaction * genkaon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); - genkaon->SetPtRange(ptMin, ptMax); - genkaon->SetYRange(yMin, yMax); - genkaon->SetPhiRange(phiMin, phiMax); - genkaon->Init(); // Generating pT and Y parametrsation in the desired kinematic range - printf(">>> ratio kaon %f\n",ratiokaon); - AddGenerator(genkaon,"Kaon", ratiokaon); - fTotalRate+=ratiokaon; + // Only if hadronic muons are included in the cocktail + if(fHadronicMuons) { + // Generating Pion Physics + // The scaling with Npart and Ncoll has been obtained to reproduced tha values presented by Valeri lors de presentatation + // a Clermont Ferrand http://pcrochet.home.cern.ch/pcrochet/files/valerie.pdf + // b range(fm) Ncoll Npart N_mu pT>0.4 GeV/c + // 0 - 3 1982 381 3.62 + // 3 - 6 1388 297 3.07 + // 6 - 9 674 177 1.76 + // 9 - 12 188 71 0.655 + // 12 - 16 15 10 0.086 + // We found the hadronic muons scales quite well with the number of participants + AliGenParam * genpion = new AliGenParam(1, AliGenMUONlib::kPion, "default", "Pion"); + genpion->SetPtRange(0,100.); + genpion->SetYRange(-8.,8); + genpion->SetPhiRange(0.,360.); + genpion->SetForceDecay(kPiToMu); + genpion->SetTrackingFlag(1); + Double_t ratiopion; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail + Double_t sigmapion = 1.80e-2; // Just for reproducing Valeries's data + Double_t brpion = 0.9999; // Branching Ratio for Pion + genpion->Init(); // Generating pT and Y parametrsation for the 4pi + ratiopion = sigmapion * brpion * (0.93*fNumberOfParticipants+0.07*fNumberOfCollisions) / sigmaReaction * genpion->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); + AliInfo(Form("Pseudo-Pion production cross-section in pp with shadowing %5.3g barns",sigmapion)); + AliInfo(Form("Pion production probability per collisions in acceptance via the muonic channel %5.3g",ratiopion)); + genpion->SetPtRange(ptMin, ptMax); + genpion->SetYRange(yMin, yMax); + genpion->SetPhiRange(phiMin, phiMax); + genpion->Init(); // Generating pT and Y parametrsation in the desired kinematic range + AddGenerator(genpion,"Pion", ratiopion); + fTotalRate+=ratiopion; + + // Generating Kaon Physics + AliGenParam * genkaon = new AliGenParam(1, AliGenMUONlib::kKaon, "default", "Kaon"); + genkaon->SetPtRange(0,100.); + genkaon->SetYRange(-8.,8); + genkaon->SetPhiRange(0.,360.); + genkaon->SetForceDecay(kKaToMu); + genkaon->SetTrackingFlag(1); + Double_t ratiokaon; // Ratio with respect to the reaction cross-section for the muonic channel in the kinematics limit of the MUONCocktail + Double_t sigmakaon = 2.40e-4; // Valerie presentation Clermont-16-jan-2004 and Alice-int-2002-06 + Double_t brkaon = 0.6351 ; // Branching Ratio for Kaon + genkaon->Init(); // Generating pT and Y parametrsation for the 4pi + ratiokaon = sigmakaon * brkaon * (0.93*fNumberOfParticipants+0.07*fNumberOfCollisions)/ sigmaReaction * genkaon->GetRelativeArea(ptMin,ptMax,yMin,yMax,phiMin,phiMax); + AliInfo(Form("Pseudo-kaon production cross-section in pp with shadowing %5.3g barns",sigmakaon)); + AliInfo(Form("Kaon production probability per collisions in acceptance via the muonic channel %5.3g",ratiokaon)); + genkaon->SetPtRange(ptMin, ptMax); + genkaon->SetYRange(yMin, yMax); + genkaon->SetPhiRange(phiMin, phiMax); + genkaon->Init(); // Generating pT and Y parametrsation in the desired kinematic range + AddGenerator(genkaon,"Kaon", ratiokaon); + fTotalRate+=ratiokaon; + } } //_________________________________________________________________________ @@ -307,68 +365,88 @@ void AliGenMUONCocktail::Generate() AliGenCocktailEntry *entry = 0; AliGenCocktailEntry *preventry = 0; AliGenerator* gen = 0; + const TObjArray *partArray = gAlice->GetMCApp()->Particles(); - TObjArray *partArray = gAlice->GetMCApp()->Particles(); - -// -// Generate the vertex position used by all generators -// +// Generate the vertex position used by all generators if(fVertexSmear == kPerEvent) Vertex(); - Bool_t primordialTrigger = kFALSE; + // Loop on primordialTrigger + Bool_t primordialTrigger = kFALSE; while(!primordialTrigger) { - - //Reseting stack - AliRunLoader * runloader = gAlice->GetRunLoader(); - if (runloader) - if (runloader->Stack()) - runloader->Stack()->Reset(); - // - // Loop over generators and generate events - Int_t igen=0; - Int_t npart =0; - - while((entry = (AliGenCocktailEntry*)next())) { - gen = entry->Generator(); - gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2)); - if ( (npart = gRandom->Poisson(entry->Rate())) >0 ) { - igen++; - if (igen ==1) entry->SetFirst(0); - else entry->SetFirst((partArray->GetEntriesFast())+1); - gen->SetNumberParticles(npart); - gen->Generate(); - entry->SetLast(partArray->GetEntriesFast()); - preventry = entry; - } - } - next.Reset(); - - // Tesitng primordial trigger : Muon pair in the MUON spectrometer acceptance 171,178 and pTCut - Int_t iPart; - fNGenerated++; - Int_t numberOfMuons=0; - // printf(">>>fNGenerated is %d\n",fNGenerated); - for(iPart=0; iPartGetEntriesFast(); iPart++){ - // gAlice->GetMCApp()->Particle(iPart)->Print(); - if ( (TMath::Abs(gAlice->GetMCApp()->Particle(iPart)->GetPdgCode())==13) && - (gAlice->GetMCApp()->Particle(iPart)->Theta()*180./TMath::Pi()>fMuonThetaMinCut) && - (gAlice->GetMCApp()->Particle(iPart)->Theta()*180./TMath::Pi()GetMCApp()->Particle(iPart)->Pt()>fMuonPtCut) ) { - gAlice->GetMCApp()->Particle(iPart)->SetProductionVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2), 0.); - numberOfMuons++; + //Reseting stack + AliRunLoader * runloader = AliRunLoader::Instance(); + if (runloader) + if (runloader->Stack()) + runloader->Stack()->Clean(); + // Loop over generators and generate events + Int_t igen=0; + Int_t npart =0; + while((entry = (AliGenCocktailEntry*)next())) { + gen = entry->Generator(); + gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2)); + if ( (npart = gRandom->Poisson(entry->Rate())) >0 ) { + igen++; + if (igen == 1) entry->SetFirst(0); + else entry->SetFirst((partArray->GetEntriesFast())+1); + // if ( (fHadronicMuons == kFALSE) && ( (gen->GetName() == "Pions") || (gen->GetName() == "Kaons") ) ) + // { AliInfo(Form("This generator %s is finally not generated. This is option for hadronic muons.",gen->GetName() ) ); } + // else { + gen->SetNumberParticles(npart); + gen->Generate(); + entry->SetLast(partArray->GetEntriesFast()); + preventry = entry; + // } + } + } + next.Reset(); + // Testing primordial trigger : Muon pair in the MUON spectrometer acceptance and pTCut + Int_t iPart; + fNGenerated++; + Int_t numberOfMuons=0; + // printf(">>>fNGenerated is %d\n",fNGenerated); + + TObjArray GoodMuons; // Used in the Invariant Mass selection cut + + for(iPart=0; iPartGetEntriesFast(); iPart++){ + + if ( (TMath::Abs(gAlice->GetMCApp()->Particle(iPart)->GetPdgCode())==13) && + (gAlice->GetMCApp()->Particle(iPart)->Theta()*180./TMath::Pi()>fMuonThetaMinCut) && + (gAlice->GetMCApp()->Particle(iPart)->Theta()*180./TMath::Pi()GetMCApp()->Particle(iPart)->Pt()>fMuonPtCut) ) { + gAlice->GetMCApp()->Particle(iPart)->SetProductionVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2), 0.); + GoodMuons.AddLast(gAlice->GetMCApp()->Particle(iPart)); + numberOfMuons++; + } + } + + // Test the invariant mass of each pair (if cut on Invariant mass is required) + Bool_t InvMassRangeOK = kTRUE; + if(fInvMassCut && (numberOfMuons>=2) ){ + TLorentzVector fV1, fV2, fVtot; + InvMassRangeOK = kFALSE; + for(iPart=0; iPartPx() ,mu1->Py() ,mu1->Pz() ,mu1->Energy() ); + fV2.SetPxPyPzE(mu2->Px() ,mu2->Py() ,mu2->Pz() ,mu2->Energy() ); + fVtot = fV1 + fV2; + + if(fVtot.M()>fInvMassMinCut && fVtot.M()= fMuonMultiplicity) && InvMassRangeOK ) primordialTrigger = kTRUE; } - } - // printf(">>> Number of Muons is %d \n", numberOfMuons); - if (numberOfMuons >= fMuonMultiplicity ) primordialTrigger = kTRUE; - } - //printf(">>> Trigger Accepted!!! \n"); fNSucceded++; - // Float_t Ratio = (Float_t) fNSucceded/fNGenerated; - // printf("Generated %d, Succeded %d and Ratio %f\n",fNGenerated, fNSucceded,Ratio); -} - - - - - + AliDebug(5,Form("Generated Events are %d and Succeeded Events are %d",fNGenerated,fNSucceded)); +}