+/**************************************************************************
+ * 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"
-#include "AliRun.h"
+
ClassImp(AliGenMUONlib)
//
// Pions
-Double_t AliGenMUONlib::PtPion(Double_t *px, Double_t *)
+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 p0 = 1.3;
- const Double_t xn = 8.28;
- const Double_t xlim=0.5;
- const Double_t t=0.160;
- const Double_t xmpi=0.139;
- const Double_t b=1.;
+ 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(p0/(p0+xlim),xn);
- xmpi2=xmpi*xmpi;
- ynorm=b*(TMath::Exp(-sqrt(xlim*xlim+xmpi2)/t));
+ y1=TMath::Power(kp0/(kp0+kxlim),kxn);
+ xmpi2=kxmpi*kxmpi;
+ ynorm=kb*(TMath::Exp(-sqrt(kxlim*kxlim+xmpi2)/kt));
a=ynorm/y1;
- if (x > xlim)
- y=a*TMath::Power(p0/(p0+x),xn);
+ if (x > kxlim)
+ y=a*TMath::Power(kp0/(kp0+x),kxn);
else
- y=b*TMath::Exp(-sqrt(x*x+xmpi2)/t);
+ y=kb*TMath::Exp(-sqrt(x*x+xmpi2)/kt);
return y*x;
}
//
// y-distribution
//
-Double_t AliGenMUONlib::YPion( Double_t *py, Double_t *)
+Double_t AliGenMUONlib::YPion( Double_t *py, Double_t */*dummy*/)
{
- const Double_t a = 7000.;
- const Double_t dy = 4.;
-
+// Pion y
Double_t y=TMath::Abs(*py);
- //
- Double_t ex = y*y/(2*dy*dy);
- return a*TMath::Exp(-ex);
+/*
+ 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()
+Int_t AliGenMUONlib::IpPion(TRandom *ran)
{
- Float_t random[1];
- gMC->Rndm(random,1);
- if (random[0] < 0.5) {
+// Pion composition
+ if (ran->Rndm() < 0.5) {
return 211;
} else {
return -211;
{
// SCALING EN MASSE PAR RAPPORT A PTPI
// MASS PI,K,ETA,RHO,OMEGA,ETA',PHI
- const Double_t hm[10] = {.13957,.493,.5488,.769,.7826,.958,1.02,0,0,0};
+ 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 fmax[10]={1.,0.3,0.55,1.0,1.0,1.0,1.0,0,0,0};
+ 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.+hm[np]*hm[np])+2.0)),12.3);
- Double_t fmax2=f5/fmax[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+hm[np]*hm[np])+2.0)),12.3)/ fmax2;
+ (sqrt(pt*pt+khm[np]*khm[np])+2.0)),12.3)/ fmax2;
return fmtscal*ptpion;
}
//
//
// pt-distribution
//____________________________________________________________
-Double_t AliGenMUONlib::PtKaon( Double_t *px, Double_t *)
+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 *)
+Double_t AliGenMUONlib::YKaon( Double_t *py, Double_t */*dummy*/)
{
- const Double_t a = 1000.;
- const Double_t dy = 4.;
-
-
+// Kaon y
Double_t y=TMath::Abs(*py);
+/*
+ const Double_t ka = 1000.;
+ const Double_t kdy = 4.;
//
- Double_t ex = y*y/(2*dy*dy);
- return a*TMath::Exp(-ex);
+ 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()
+Int_t AliGenMUONlib::IpKaon(TRandom *ran)
{
- Float_t random[1];
- gMC->Rndm(random,1);
- if (random[0] < 0.5) {
+// Kaon composition
+ if (ran->Rndm() < 0.5) {
return 321;
} else {
return -321;
//
// pt-distribution
//____________________________________________________________
-Double_t AliGenMUONlib::PtJpsi( Double_t *px, Double_t *)
+Double_t AliGenMUONlib::PtJpsi( Double_t *px, Double_t */*dummy*/)
{
- const Double_t pt0 = 4.;
- const Double_t xn = 3.6;
+// J/Psi pT
+ const Double_t kpt0 = 4.;
+ const Double_t kxn = 3.6;
Double_t x=*px;
//
- Double_t pass1 = 1.+(x/pt0)*(x/pt0);
- return x/TMath::Power(pass1,xn);
+ 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::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 *)
+Double_t AliGenMUONlib::YJpsi(Double_t *py, Double_t */*dummy*/)
{
- const Double_t y0 = 4.;
- const Double_t b=1.;
+// J/psi y
+ const Double_t ky0 = 4.;
+ const Double_t kb=1.;
Double_t yj;
Double_t y=TMath::Abs(*py);
//
- if (y < y0)
- yj=b;
+ if (y < ky0)
+ yj=kb;
else
- yj=b*TMath::Exp(-(y-y0)*(y-y0)/2);
+ 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::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()
+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 * )
+Double_t AliGenMUONlib::PtUpsilon( Double_t *px, Double_t */*dummy*/ )
{
- const Double_t pt0 = 5.3;
- const Double_t xn = 2.5;
+// Upsilon pT
+ const Double_t kpt0 = 5.3;
+ const Double_t kxn = 2.5;
Double_t x=*px;
//
- Double_t pass1 = 1.+(x/pt0)*(x/pt0);
- return x/TMath::Power(pass1,xn);
+ 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::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 *)
+Double_t AliGenMUONlib::YUpsilon(Double_t *py, Double_t */*dummy*/)
{
- const Double_t y0 = 3.;
- const Double_t b=1.;
+// Upsilon y
+ const Double_t ky0 = 3.;
+ const Double_t kb=1.;
Double_t yu;
Double_t y=TMath::Abs(*py);
//
- if (y < y0)
- yu=b;
+ if (y < ky0)
+ yu=kb;
else
- yu=b*TMath::Exp(-(y-y0)*(y-y0)/2);
+ 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::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()
+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 *)
+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 *)
+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*/)
{
- Double_t *dummy=0;
- return YJpsi(px,dummy);
+// Eta y
+ Double_t *dum=0;
+ return YJpsi(px,dum);
}
// particle composition
//
-Int_t AliGenMUONlib::IpPhi()
+Int_t AliGenMUONlib::IpEta(TRandom *)
{
- return 41;
+// Eta composition
+ return 221;
}
//
//
// pt-distribution
//____________________________________________________________
-Double_t AliGenMUONlib::PtCharm( Double_t *px, Double_t *)
+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*/)
{
- const Double_t pt0 = 4.08;
- const Double_t xn = 9.40;
+// Charm pT
+ const Double_t kpt0 = 2.12;
+ const Double_t kxn = 2.78;
+
Double_t x=*px;
//
- Double_t pass1 = 1.+(x/pt0)*(x/pt0);
- return x/TMath::Power(pass1,xn);
+ 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 *)
+Double_t AliGenMUONlib::YCharm( Double_t *px, Double_t */*dummy*/)
{
- Double_t *dummy=0;
- return YJpsi(px,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()
+
+Int_t AliGenMUONlib::IpCharm(TRandom *ran)
{
- Float_t random[2];
+// Charm composition
+ Float_t random;
Int_t ip;
// 411,421,431,4122
- gMC->Rndm(random,2);
- if (random[0] < 0.5) {
- ip=411;
- } else if (random[0] < 0.75) {
- ip=421;
- } else if (random[0] < 0.90) {
- ip=431;
+ 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;
+ ip=-4122;
}
- if (random[1] < 0.5) {ip=-ip;}
return ip;
}
-
//
// Beauty
//
//
// pt-distribution
//____________________________________________________________
-Double_t AliGenMUONlib::PtBeauty( Double_t *px, Double_t *)
+Double_t AliGenMUONlib::PtBeauty( Double_t *px, Double_t */*dummy*/)
{
- const Double_t pt0 = 4.;
- const Double_t xn = 3.6;
+// Beauty pT
+ const Double_t kpt0 = 6.53;
+ const Double_t kxn = 3.59;
Double_t x=*px;
//
- Double_t pass1 = 1.+(x/pt0)*(x/pt0);
- return x/TMath::Power(pass1,xn);
+ 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 *)
+Double_t AliGenMUONlib::YBeauty( Double_t *px, Double_t */*dummy*/)
{
- Double_t *dummy=0;
- return YJpsi(px,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()
+
+Int_t AliGenMUONlib::IpBeauty(TRandom *ran)
{
- Float_t random[2];
+// Beauty Composition
+ Float_t random;
Int_t ip;
- gMC->Rndm(random,2);
- if (random[0] < 0.5) {
- ip=511;
- } else if (random[0] < 0.75) {
- ip=521;
- } else if (random[0] < 0.90) {
- ip=531;
+ 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;
+ ip=-5122;
}
- if (random[1] < 0.5) {ip=-ip;}
- return ip;
+ return ip;
}
+
typedef Double_t (*GenFunc) (Double_t*, Double_t*);
-GenFunc AliGenMUONlib::GetPt(Param_t param)
+GenFunc AliGenMUONlib::GetPt(Int_t param, const char* tname) const
{
+// Return pointer to pT parameterisation
+ TString sname = TString(tname);
GenFunc func;
switch (param)
{
- case phi_p:
+ case kPhi:
func=PtPhi;
break;
- case jpsi_p:
- func=PtJpsi;
+ case kOmega:
+ func=PtOmega;
break;
- case upsilon_p:
- func=PtUpsilon;
+ case kEta:
+ func=PtEta;
break;
- case charm_p:
- func=PtCharm;
+ 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 == "Flat") {
+ func=PtJpsiFlat;
+ } else {
+ func=PtJpsi;
+ }
break;
- case beauty_p:
- func=PtBeauty;
+ case kJpsiFromB:
+ func = PtJpsiBPbPb;
break;
- case pion_p:
+ 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 == "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 kaon_p:
+ case kKaon:
func=PtKaon;
break;
default:
return func;
}
-GenFunc AliGenMUONlib::GetY(Param_t param)
+GenFunc AliGenMUONlib::GetY(Int_t param, const char* tname) const
{
+ //
+ // Return pointer to y- parameterisation
+ //
+ TString sname = TString(tname);
GenFunc func;
switch (param)
{
- case phi_p:
+ case kPhi:
func=YPhi;
break;
- case jpsi_p:
- func=YJpsi;
+ case kEta:
+ func=YEta;
+ break;
+ case kOmega:
+ func=YOmega;
break;
- case upsilon_p:
- func=YUpsilon;
+ 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 == "Flat") {
+ func=YJpsiFlat;
+ } else {
+ func=YJpsi;
+ }
break;
- case charm_p:
+ 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 == "Flat") {
+ func=YUpsilonFlat;
+ } else {
+ func=YUpsilon;
+ }
+ break;
+ case kCharm:
func=YCharm;
break;
- case beauty_p:
+ case kBeauty:
func=YBeauty;
break;
- case pion_p:
+ case kPion:
func=YPion;
break;
- case kaon_p:
+ case kKaon:
func=YKaon;
break;
default:
}
return func;
}
-typedef Int_t (*GenFuncIp) ();
-GenFuncIp AliGenMUONlib::GetIp(Param_t param)
+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 phi_p:
+ case kPhi:
func=IpPhi;
break;
- case jpsi_p:
+ 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 upsilon_p:
+ case kUpsilon:
func=IpUpsilon;
break;
- case charm_p:
+ case kUpsilonFamily:
+ func=IpUpsilonFamily;
+ break;
+ case kUpsilonP:
+ func=IpUpsilonP;
+ break;
+ case kUpsilonPP:
+ func=IpUpsilonPP;
+ break;
+ case kCharm:
func=IpCharm;
break;
- case beauty_p:
+ case kBeauty:
func=IpBeauty;
break;
- case pion_p:
+ case kPion:
func=IpPion;
break;
- case kaon_p:
+ case kKaon:
func=IpKaon;
break;
default:
+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;
+}
+
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff