/************************************************************************** * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * * * * Author: The ALICE Off-line Project. * * Contributors are mentioned in the code where appropriate. * * * * Permission to use, copy, modify and distribute this software and its * * documentation strictly for non-commercial purposes is hereby granted * * without fee, provided that the above copyright notice appears in all * * copies and that both the copyright notice and this permission notice * * appear in the supporting documentation. The authors make no claims * * about the suitability of this software for any purpose. It is * * provided "as is" without express or implied warranty. * **************************************************************************/ /* $Id$ */ // Library class for particle pt and y distributions used for // muon spectrometer simulations. // To be used with AliGenParam. // The following particle typed can be simulated: // pi, K, phi, omega, eta, J/Psi, Upsilon, charm and beauty mesons. // // andreas.morsch@cern.ch // #include "TMath.h" #include "TRandom.h" #include "AliGenMUONlib.h" ClassImp(AliGenMUONlib) // // Pions Double_t AliGenMUONlib::PtPion(Double_t *px, Double_t* /*dummy*/) { // // PT-PARAMETERIZATION CDF, PRL 61(88) 1819 // POWER LAW FOR PT > 500 MEV // MT SCALING BELOW (T=160 MEV) // const Double_t kp0 = 1.3; const Double_t kxn = 8.28; const Double_t kxlim=0.5; const Double_t kt=0.160; const Double_t kxmpi=0.139; const Double_t kb=1.; Double_t y, y1, xmpi2, ynorm, a; Double_t x=*px; // y1=TMath::Power(kp0/(kp0+kxlim),kxn); xmpi2=kxmpi*kxmpi; ynorm=kb*(TMath::Exp(-sqrt(kxlim*kxlim+xmpi2)/kt)); a=ynorm/y1; if (x > kxlim) y=a*TMath::Power(kp0/(kp0+x),kxn); else y=kb*TMath::Exp(-sqrt(x*x+xmpi2)/kt); return y*x; } // // y-distribution // Double_t AliGenMUONlib::YPion( Double_t *py, Double_t */*dummy*/) { // Pion y Double_t y=TMath::Abs(*py); /* const Double_t ka = 7000.; const Double_t kdy = 4.; Double_t ex = y*y/(2*kdy*kdy); return ka*TMath::Exp(-ex); */ return 1.16526e+04+y*-3.79886e+03+y*y*4.31130e+02; } // particle composition // Int_t AliGenMUONlib::IpPion(TRandom *ran) { // Pion composition if (ran->Rndm() < 0.5) { return 211; } else { return -211; } } //____________________________________________________________ // // Mt-scaling Double_t AliGenMUONlib::PtScal(Double_t pt, Int_t np) { // SCALING EN MASSE PAR RAPPORT A PTPI // MASS PI,K,ETA,RHO,OMEGA,ETA',PHI const Double_t khm[10] = {.13957,.493,.5488,.769,.7826,.958,1.02,0,0,0}; // VALUE MESON/PI AT 5 GEV const Double_t kfmax[10]={1.,0.3,0.55,1.0,1.0,1.0,1.0,0,0,0}; np--; Double_t f5=TMath::Power(((sqrt(100.018215)+2.)/(sqrt(100.+khm[np]*khm[np])+2.0)),12.3); Double_t fmax2=f5/kfmax[np]; // PIONS Double_t ptpion=100.*PtPion(&pt, (Double_t*) 0); Double_t fmtscal=TMath::Power(((sqrt(pt*pt+0.018215)+2.)/ (sqrt(pt*pt+khm[np]*khm[np])+2.0)),12.3)/ fmax2; return fmtscal*ptpion; } // // kaon // // pt-distribution //____________________________________________________________ Double_t AliGenMUONlib::PtKaon( Double_t *px, Double_t */*dummy*/) { // Kaon pT return PtScal(*px,2); } // y-distribution //____________________________________________________________ Double_t AliGenMUONlib::YKaon( Double_t *py, Double_t */*dummy*/) { // Kaon y Double_t y=TMath::Abs(*py); /* const Double_t ka = 1000.; const Double_t kdy = 4.; // Double_t ex = y*y/(2*kdy*kdy); return ka*TMath::Exp(-ex); */ return 1.16526e+04+y*-3.79886e+03+y*y*4.31130e+02; } // particle composition // Int_t AliGenMUONlib::IpKaon(TRandom *ran) { // Kaon composition if (ran->Rndm() < 0.5) { return 321; } else { return -321; } } // J/Psi // // // pt-distribution //____________________________________________________________ Double_t AliGenMUONlib::PtJpsi( Double_t *px, Double_t */*dummy*/) { // J/Psi pT const Double_t kpt0 = 4.; const Double_t kxn = 3.6; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } Double_t AliGenMUONlib::PtJpsiCDFscaled( Double_t *px, Double_t */*dummy*/) { // J/Psi pT const Double_t kpt0 = 4.703; const Double_t kxn = 3.826; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } Double_t AliGenMUONlib::PtJpsiCDFscaledPP( Double_t *px, Double_t */*dummy*/) { // J/Psi pT // // pp 14 TeV // // scaled from CDF data at 2 TeV const Double_t kpt0 = 5.355; const Double_t kxn = 3.821; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } Double_t AliGenMUONlib::PtJpsiFlat( Double_t */*px*/, Double_t */*dummy*/ ) { return 1.; } Double_t AliGenMUONlib::PtJpsiPbPb( Double_t *px, Double_t */*dummy*/) { // J/Psi pT spectrum // // R. Vogt 2002 // PbPb 5.5 TeV // MRST HO // mc = 1.4 GeV, pt-kick 1 GeV // Float_t x = px[0]; Float_t c[8] = { -2.13098e+00, 9.46552e+00, -5.06799e+00, 1.27260e+00, -1.83806e-01, 1.55853e-02, -7.23241e-04, 1.42105e-05 }; Double_t y; if (x < 10.) { Int_t j; y = c[j = 7]; while (j > 0) y = y * x +c[--j]; y = x * TMath::Exp(y); } else { y = 0.; } return y; } Double_t AliGenMUONlib::PtJpsiBPbPb( Double_t *px, Double_t */*dummy*/) { // J/Psi pT spectrum // B -> J/Psi X Double_t x0 = 4.0384; Double_t n = 3.0288; Double_t x = px[0]; Double_t y = x / TMath::Power((1. + (x/x0)*(x/x0)), n); return y; } Double_t AliGenMUONlib::PtJpsiPP( Double_t *px, Double_t */*dummy*/) { // J/Psi pT spectrum // // R. Vogt 2002 // pp 14 TeV // MRST HO // mc = 1.4 GeV, pt-kick 1 GeV // Float_t x = px[0]; Float_t c[4] = {8.47471e+00, -1.93567e+00, 1.50271e-01, -5.51212e-03}; Double_t y; if (x < 10.) { Int_t j; y = c[j = 3]; while (j > 0) y = y * x +c[--j]; y = x * TMath::Exp(y); } else { y = 0.; } return y; } // // y-distribution //____________________________________________________________ Double_t AliGenMUONlib::YJpsi(Double_t *py, Double_t */*dummy*/) { // J/psi y const Double_t ky0 = 4.; const Double_t kb=1.; Double_t yj; Double_t y=TMath::Abs(*py); // if (y < ky0) yj=kb; else yj=kb*TMath::Exp(-(y-ky0)*(y-ky0)/2); return yj; } Double_t AliGenMUONlib::YJpsiFlat( Double_t */*py*/, Double_t */*dummy*/ ) { return 1.; } Double_t AliGenMUONlib::YJpsiPbPb( Double_t *px, Double_t */*dummy*/) { // // J/Psi y // // // R. Vogt 2002 // PbPb 5.5 TeV // MRST HO // mc = 1.4 GeV, pt-kick 1 GeV // Double_t c[5] = {-6.03425e+02, 4.98257e+02, -1.38794e+02, 1.62209e+01, -6.85955e-01}; Double_t x = TMath::Abs(px[0]); Double_t y; if (x < 4.) { y = 31.754; } else if (x < 6) { Int_t j; y = c[j = 4]; while (j > 0) y = y * x + c[--j]; } else { y =0.; } return y; } Double_t AliGenMUONlib::YJpsiCDFscaled( Double_t *px, Double_t* dummy) { // J/Psi y return AliGenMUONlib::YJpsiPbPb(px, dummy); } Double_t AliGenMUONlib::YJpsiCDFscaledPP( Double_t *px, Double_t* dummy) { // J/Psi y return AliGenMUONlib::YJpsiPP(px, dummy); } Double_t AliGenMUONlib::YJpsiPP( Double_t *px, Double_t */*dummy*/) { // // J/Psi y // // // R. Vogt 2002 // pp 14 TeV // MRST HO // mc = 1.4 GeV, pt-kick 1 GeV // Double_t c[5] = {1.38532e+00, 1.00596e+02, -3.46378e+01, 3.94172e+00, -1.48319e-01}; Double_t x = TMath::Abs(px[0]); Double_t y; if (x < 2.5) { y = 96.455 - 0.8483 * x * x; } else if (x < 7.9) { Int_t j; y = c[j = 4]; while (j > 0) y = y * x + c[--j]; } else { y =0.; } return y; } Double_t AliGenMUONlib::YJpsiBPbPb( Double_t *px, Double_t */*dummy*/) { // // J/Psi from B->J/Psi X // // Double_t c[7] = {7.37025e-02, 0., -2.94487e-03, 0., 6.07953e-06, 0., 5.39219e-07}; Double_t x = TMath::Abs(px[0]); Double_t y; if (x > 6.) { y = 0.; } else { Int_t j; y = c[j = 6]; while (j > 0) y = y * x + c[--j]; } return y; } // particle composition // Int_t AliGenMUONlib::IpJpsi(TRandom *) { // J/Psi composition return 443; } Int_t AliGenMUONlib::IpPsiP(TRandom *) { // Psi prime composition return 100443; } Int_t AliGenMUONlib::IpJpsiFamily(TRandom *) { // J/Psi composition Int_t ip; Float_t r = gRandom->Rndm(); if (r < 0.98) { ip = 443; } else { ip = 100443; } return ip; } // Upsilon // // // pt-distribution //____________________________________________________________ Double_t AliGenMUONlib::PtUpsilon( Double_t *px, Double_t */*dummy*/ ) { // Upsilon pT const Double_t kpt0 = 5.3; const Double_t kxn = 2.5; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } Double_t AliGenMUONlib::PtUpsilonCDFscaled( Double_t *px, Double_t */*dummy*/ ) { // Upsilon pT const Double_t kpt0 = 7.753; const Double_t kxn = 3.042; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } Double_t AliGenMUONlib::PtUpsilonCDFscaledPP( Double_t *px, Double_t */*dummy*/ ) { // Upsilon pT // // pp 14 TeV // // scaled from CDF data at 2 TeV const Double_t kpt0 = 8.610; const Double_t kxn = 3.051; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } Double_t AliGenMUONlib::PtUpsilonFlat( Double_t */*px*/, Double_t */*dummy*/ ) { return 1.; } Double_t AliGenMUONlib::PtUpsilonPbPb( Double_t *px, Double_t */*dummy*/) { // // Upsilon pT // // // R. Vogt 2002 // PbPb 5.5 TeV // MRST HO // mc = 1.4 GeV, pt-kick 1 GeV // Float_t x = px[0]; Double_t c[8] = { -1.03488e+01, 1.28065e+01, -6.60500e+00, 1.66140e+00, -2.34293e-01, 1.86925e-02, -7.80708e-04, 1.30610e-05 }; Double_t y; if (x < 10.) { Int_t j; y = c[j = 7]; while (j > 0) y = y * x +c[--j]; y = x * TMath::Exp(y); } else { y = 0.; } return y; } Double_t AliGenMUONlib::PtUpsilonPP( Double_t *px, Double_t */*dummy*/) { // // Upsilon pT // // // R. Vogt 2002 // pp 14 TeV // MRST HO // mc = 1.4 GeV, pt-kick 1 GeV // Float_t x = px[0]; Double_t c[8] = {-7.93955e+00, 1.06306e+01, -5.21392e+00, 1.19703e+00, -1.45718e-01, 8.95151e-03, -2.04806e-04, -1.13053e-06}; Double_t y; if (x < 10.) { Int_t j; y = c[j = 7]; while (j > 0) y = y * x +c[--j]; y = x * TMath::Exp(y); } else { y = 0.; } return y; } // // y-distribution // //____________________________________________________________ Double_t AliGenMUONlib::YUpsilon(Double_t *py, Double_t */*dummy*/) { // Upsilon y const Double_t ky0 = 3.; const Double_t kb=1.; Double_t yu; Double_t y=TMath::Abs(*py); // if (y < ky0) yu=kb; else yu=kb*TMath::Exp(-(y-ky0)*(y-ky0)/2); return yu; } Double_t AliGenMUONlib::YUpsilonPbPb( Double_t *px, Double_t */*dummy*/) { // // Upsilon y // // // R. Vogt 2002 // PbPb 5.5 TeV // MRST HO // mc = 1.4 GeV, pt-kick 1 GeV // Double_t c[7] = {3.40036e-01, -3.98882e-07, -4.48398e-03, 8.46411e-08, -6.10854e-04, -2.99753e-09, 1.28895e-05}; Double_t x = px[0]; if (TMath::Abs(x) > 5.55) return 0.; Int_t j; Double_t y = c[j = 6]; while (j > 0) y = y * x +c[--j]; return y; } Double_t AliGenMUONlib::YUpsilonCDFscaled( Double_t *px, Double_t *dummy) { // Upsilon y return AliGenMUONlib::YUpsilonPbPb(px, dummy); } Double_t AliGenMUONlib::YUpsilonCDFscaledPP( Double_t *px, Double_t *dummy) { // Upsilon y return AliGenMUONlib::YUpsilonPP(px, dummy); } Double_t AliGenMUONlib::YUpsilonFlat( Double_t */*px*/, Double_t */*dummy*/) { // Upsilon y return 1.; } Double_t AliGenMUONlib::YUpsilonPP( Double_t *px, Double_t */*dummy*/) { // // Upsilon y // // // R. Vogt 2002 // p p 14. TeV // MRST HO // mc = 1.4 GeV, pt-kick 1 GeV // Double_t c[7] = {8.91936e-01, -6.46645e-07, -1.52774e-02, 4.28677e-08, -7.01517e-04, -6.20539e-10, 1.29943e-05}; Double_t x = px[0]; if (TMath::Abs(x) > 6.2) return 0.; Int_t j; Double_t y = c[j = 6]; while (j > 0) y = y * x +c[--j]; return y; } // particle composition // Int_t AliGenMUONlib::IpUpsilon(TRandom *) { // y composition return 553; } Int_t AliGenMUONlib::IpUpsilonP(TRandom *) { // y composition return 100553; } Int_t AliGenMUONlib::IpUpsilonPP(TRandom *) { // y composition return 200553; } Int_t AliGenMUONlib::IpUpsilonFamily(TRandom *) { // y composition Int_t ip; Float_t r = gRandom->Rndm(); if (r < 0.712) { ip = 553; } else if (r < 0.896) { ip = 100553; } else { ip = 200553; } return ip; } // // Phi // // // pt-distribution (by scaling of pion distribution) //____________________________________________________________ Double_t AliGenMUONlib::PtPhi( Double_t *px, Double_t */*dummy*/) { // Phi pT return PtScal(*px,7); } // y-distribution Double_t AliGenMUONlib::YPhi( Double_t *px, Double_t */*dummy*/) { // Phi y Double_t *dum=0; return YJpsi(px,dum); } // particle composition // Int_t AliGenMUONlib::IpPhi(TRandom *) { // Phi composition return 333; } // // omega // // // pt-distribution (by scaling of pion distribution) //____________________________________________________________ Double_t AliGenMUONlib::PtOmega( Double_t *px, Double_t */*dummy*/) { // Omega pT return PtScal(*px,5); } // y-distribution Double_t AliGenMUONlib::YOmega( Double_t *px, Double_t */*dummy*/) { // Omega y Double_t *dum=0; return YJpsi(px,dum); } // particle composition // Int_t AliGenMUONlib::IpOmega(TRandom *) { // Omega composition return 223; } // // Eta // // // pt-distribution (by scaling of pion distribution) //____________________________________________________________ Double_t AliGenMUONlib::PtEta( Double_t *px, Double_t */*dummy*/) { // Eta pT return PtScal(*px,3); } // y-distribution Double_t AliGenMUONlib::YEta( Double_t *px, Double_t */*dummy*/) { // Eta y Double_t *dum=0; return YJpsi(px,dum); } // particle composition // Int_t AliGenMUONlib::IpEta(TRandom *) { // Eta composition return 221; } // // Charm // // // pt-distribution //____________________________________________________________ Double_t AliGenMUONlib::PtCharm( Double_t *px, Double_t */*dummy*/) { // Charm pT const Double_t kpt0 = 2.25; const Double_t kxn = 3.17; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } Double_t AliGenMUONlib::PtCharmCentral( Double_t *px, Double_t */*dummy*/) { // Charm pT const Double_t kpt0 = 2.12; const Double_t kxn = 2.78; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } // y-distribution Double_t AliGenMUONlib::YCharm( Double_t *px, Double_t */*dummy*/) { // Charm y :: Carrer & Dainese : ALICE-INT-2003-019 v.3 (hep-ph/0311225) // Pythia tuned to reproduce the distribution given by the HVQMNR program based on NLO calculations (pQCD) // shadowing + kt broadening Double_t x=px[0]; Double_t c[2]={-2.42985e-03,-2.31001e-04}; Double_t y=1+(c[0]*TMath::Power(x,2))+(c[1]*TMath::Power(x,4)); Double_t ycharm; if (TMath::Abs(x)>8) { ycharm=0.; } else { ycharm=TMath::Power(y,3); } return ycharm; } Int_t AliGenMUONlib::IpCharm(TRandom *ran) { // Charm composition Float_t random; Int_t ip; // 411,421,431,4122 random = ran->Rndm(); // Taux de production Carrer & Dainese : ALICE-INT-2003-019 v.3 // >>>>> cf. tab 4 p 11 if (random < 0.30) { ip=421; } else if (random < 0.60) { ip=-421; } else if (random < 0.70) { ip=411; } else if (random < 0.80) { ip=-411; } else if (random < 0.86) { ip=431; } else if (random < 0.92) { ip=-431; } else if (random < 0.96) { ip=4122; } else { ip=-4122; } return ip; } // // Beauty // // // pt-distribution //____________________________________________________________ Double_t AliGenMUONlib::PtBeauty( Double_t *px, Double_t */*dummy*/) { // Beauty pT const Double_t kpt0 = 6.53; const Double_t kxn = 3.59; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } Double_t AliGenMUONlib::PtBeautyCentral( Double_t *px, Double_t */*dummy*/) { // Beauty pT const Double_t kpt0 = 6.14; const Double_t kxn = 2.93; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } // y-distribution Double_t AliGenMUONlib::YBeauty( Double_t *px, Double_t */*dummy*/) { // Beauty y :: Carrer & Dainese : ALICE-INT-2003-019 v.3 (hep-ph/0311225) // Pythia tuned to reproduce the distribution given by the HVQMNR program based on NLO calculations (pQCD) // shadowing + kt broadening Double_t x=px[0]; Double_t c[2]={-1.27590e-02,-2.42731e-04}; Double_t y=1+c[0]*TMath::Power(x,2)+c[1]*TMath::Power(x,4); Double_t ybeauty; if (TMath::Abs(x)>6) { ybeauty=0.; } else { ybeauty=TMath::Power(y,3); } return ybeauty; } Int_t AliGenMUONlib::IpBeauty(TRandom *ran) { // Beauty Composition Float_t random; Int_t ip; random = ran->Rndm(); // Taux de production Carrer & Dainese : ALICE-INT-2003-019 v.3 // >>>>> cf. tab 4 p 11 if (random < 0.20) { ip=511; } else if (random < 0.40) { ip=-511; } else if (random < 0.605) { ip=521; } else if (random < 0.81) { ip=-521; } else if (random < 0.87) { ip=531; } else if (random < 0.93) { ip=-531; } else if (random < 0.965) { ip=5122; } else { ip=-5122; } return ip; } typedef Double_t (*GenFunc) (Double_t*, Double_t*); GenFunc AliGenMUONlib::GetPt(Int_t param, const char* tname) const { // Return pointer to pT parameterisation TString sname = TString(tname); GenFunc func; switch (param) { case kPhi: func=PtPhi; break; case kOmega: func=PtOmega; break; case kEta: func=PtEta; break; case kJpsiFamily: case kPsiP: case kJpsi: if (sname == "Vogt" || sname == "Vogt PbPb") { func=PtJpsiPbPb; } else if (sname == "Vogt pp") { func=PtJpsiPP; } else if (sname == "CDF scaled") { func=PtJpsiCDFscaled; } else if (sname == "CDF pp") { func=PtJpsiCDFscaledPP; } else if (sname == "Flat") { func=PtJpsiFlat; } else { func=PtJpsi; } break; case kJpsiFromB: func = PtJpsiBPbPb; break; case kUpsilonFamily: case kUpsilonP: case kUpsilonPP: case kUpsilon: if (sname == "Vogt" || sname == "Vogt PbPb") { func=PtUpsilonPbPb; } else if (sname == "Vogt pp") { func=PtUpsilonPP; } else if (sname == "CDF scaled") { func=PtUpsilonCDFscaled; } else if (sname == "CDF pp") { func=PtUpsilonCDFscaledPP; } else if (sname == "Flat") { func=PtUpsilonFlat; } else { func=PtUpsilon; } break; case kCharm: if (sname == "central") { func=PtCharmCentral; } else { func=PtCharm; } break; case kBeauty: if (sname == "central") { func=PtBeautyCentral; } else { func=PtBeauty; } break; case kPion: func=PtPion; break; case kKaon: func=PtKaon; break; case kChi_c0: func=PtChi_c0; break; case kChi_c1: func=PtChi_c1; break; case kChi_c2: func=PtChi_c2; break; case kChi_c: func=PtChi_c; break; default: func=0; printf(" unknown parametrisation\n"); } return func; } GenFunc AliGenMUONlib::GetY(Int_t param, const char* tname) const { // // Return pointer to y- parameterisation // TString sname = TString(tname); GenFunc func; switch (param) { case kPhi: func=YPhi; break; case kEta: func=YEta; break; case kOmega: func=YOmega; break; case kJpsiFamily: case kPsiP: case kJpsi: if (sname == "Vogt" || sname == "Vogt PbPb") { func=YJpsiPbPb; } else if (sname == "Vogt pp"){ func=YJpsiPP; } else if (sname == "CDF scaled") { func=YJpsiCDFscaled; } else if (sname == "CDF pp") { func=YJpsiCDFscaledPP; } else if (sname == "Flat") { func=YJpsiFlat; } else { func=YJpsi; } break; case kJpsiFromB: func = YJpsiBPbPb; break; case kUpsilonFamily: case kUpsilonP: case kUpsilonPP: case kUpsilon: if (sname == "Vogt" || sname == "Vogt PbPb") { func=YUpsilonPbPb; } else if (sname == "Vogt pp") { func = YUpsilonPP; } else if (sname == "CDF scaled") { func=YUpsilonCDFscaled; } else if (sname == "CDF pp") { func=YUpsilonCDFscaledPP; } else if (sname == "Flat") { func=YUpsilonFlat; } else { func=YUpsilon; } break; case kCharm: func=YCharm; break; case kBeauty: func=YBeauty; break; case kPion: func=YPion; break; case kKaon: func=YKaon; break; case kChi_c0: func=YChi_c0; break; case kChi_c1: func=YChi_c1; break; case kChi_c2: func=YChi_c2; break; case kChi_c: func=YChi_c; break; default: func=0; printf(" unknown parametrisation\n"); } return func; } // // Chi // // // pt-distribution //____________________________________________________________ Double_t AliGenMUONlib::PtChi_c0( Double_t *px, Double_t */*dummy*/) { // Chi_c1 pT const Double_t kpt0 = 4.; const Double_t kxn = 3.6; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } Double_t AliGenMUONlib::PtChi_c1( Double_t *px, Double_t */*dummy*/) { // Chi_c1 pT const Double_t kpt0 = 4.; const Double_t kxn = 3.6; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } Double_t AliGenMUONlib::PtChi_c2( Double_t *px, Double_t */*dummy*/) { // Chi_c2 pT const Double_t kpt0 = 4.; const Double_t kxn = 3.6; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } Double_t AliGenMUONlib::PtChi_c( Double_t *px, Double_t */*dummy*/) { // Chi_c family pT const Double_t kpt0 = 4.; const Double_t kxn = 3.6; Double_t x=*px; // Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); return x/TMath::Power(pass1,kxn); } // // y-distribution //____________________________________________________________ Double_t AliGenMUONlib::YChi_c0(Double_t *py, Double_t */*dummy*/) { // Chi-1c y const Double_t ky0 = 4.; const Double_t kb=1.; Double_t yj; Double_t y=TMath::Abs(*py); // if (y < ky0) yj=kb; else yj=kb*TMath::Exp(-(y-ky0)*(y-ky0)/2); return yj; } Double_t AliGenMUONlib::YChi_c1(Double_t *py, Double_t */*dummy*/) { // Chi-1c y const Double_t ky0 = 4.; const Double_t kb=1.; Double_t yj; Double_t y=TMath::Abs(*py); // if (y < ky0) yj=kb; else yj=kb*TMath::Exp(-(y-ky0)*(y-ky0)/2); return yj; } Double_t AliGenMUONlib::YChi_c2(Double_t *py, Double_t */*dummy*/) { // Chi-2c y const Double_t ky0 = 4.; const Double_t kb=1.; Double_t yj; Double_t y=TMath::Abs(*py); // if (y < ky0) yj=kb; else yj=kb*TMath::Exp(-(y-ky0)*(y-ky0)/2); return yj; } Double_t AliGenMUONlib::YChi_c(Double_t *py, Double_t */*dummy*/) { // Chi_c family y const Double_t ky0 = 4.; const Double_t kb=1.; Double_t yj; Double_t y=TMath::Abs(*py); // if (y < ky0) yj=kb; else yj=kb*TMath::Exp(-(y-ky0)*(y-ky0)/2); return yj; } // particle composition // Int_t AliGenMUONlib::IpChi_c0(TRandom *) { // Chi composition return 10441; } // Int_t AliGenMUONlib::IpChi_c1(TRandom *) { // Chi composition return 20443; } Int_t AliGenMUONlib::IpChi_c2(TRandom *) { // Chi_c2 prime composition return 445; } Int_t AliGenMUONlib::IpChi_c(TRandom *) { // Chi composition Int_t ip; Float_t r = gRandom->Rndm(); if (r < 0.001) { ip = 10441; } else if( r < 0.377 ) { ip = 20443; } else { ip = 445; } return ip; } //_____________________________________________________________ typedef Int_t (*GenFuncIp) (TRandom *); GenFuncIp AliGenMUONlib::GetIp(Int_t param, const char* /*tname*/) const { // Return pointer to particle type parameterisation GenFuncIp func; switch (param) { case kPhi: func=IpPhi; break; case kEta: func=IpEta; break; case kOmega: func=IpOmega; break; case kJpsiFamily: func=IpJpsiFamily; break; case kPsiP: func=IpPsiP; break; case kJpsi: case kJpsiFromB: func=IpJpsi; break; case kUpsilon: func=IpUpsilon; break; case kUpsilonFamily: func=IpUpsilonFamily; break; case kUpsilonP: func=IpUpsilonP; break; case kUpsilonPP: func=IpUpsilonPP; break; case kCharm: func=IpCharm; break; case kBeauty: func=IpBeauty; break; case kPion: func=IpPion; break; case kKaon: func=IpKaon; break; case kChi_c0: func=IpChi_c0; break; case kChi_c1: func=IpChi_c1; break; case kChi_c2: func=IpChi_c2; break; case kChi_c: func=IpChi_c; break; default: func=0; printf(" unknown parametrisation\n"); } return func; } Float_t AliGenMUONlib::Interpolate(Float_t x, Float_t* y, Float_t x0, Float_t dx, Int_t n, Int_t no) { // // Neville's alorithm for interpolation // // x: x-value // y: Input array // x0: minimum x // dx: step size // n: number of data points // no: order of polynom // Float_t* c = new Float_t[n]; Float_t* d = new Float_t[n]; Int_t m, i; for (i = 0; i < n; i++) { c[i] = y[i]; d[i] = y[i]; } Int_t ns = int((x - x0)/dx); Float_t y1 = y[ns]; ns--; for (m = 0; m < no; m++) { for (i = 0; i < n-m; i++) { Float_t ho = x0 + Float_t(i) * dx - x; Float_t hp = x0 + Float_t(i+m+1) * dx - x; Float_t w = c[i+1] - d[i]; Float_t den = ho-hp; den = w/den; d[i] = hp * den; c[i] = ho * den; } Float_t dy; if (2*ns < (n-m-1)) { dy = c[ns+1]; } else { dy = d[ns--]; } y1 += dy;} delete[] c; delete[] d; return y1; }