[u/mrichter/AliRoot.git] / STEER / STEERBase / AliTOFPIDResponse.cxx

/**************************************************************************
 * 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.                  *
 **************************************************************************/

//-----------------------------------------------------------------//
//                                                                 //
//           Implementation of the TOF PID class                   //
//      Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch         //
//                                                                 //
//-----------------------------------------------------------------//

#include "TMath.h"
#include "AliLog.h"
#include "TF1.h"
#include "TH1F.h"
#include "TH1D.h"
#include "TFile.h"
#include "TRandom.h"

#include "AliTOFPIDResponse.h"

ClassImp(AliTOFPIDResponse)

TF1 *AliTOFPIDResponse::fTOFtailResponse = NULL; // function to generate a TOF tail
TH1F *AliTOFPIDResponse::fHmismTOF = NULL; // TOF mismatch distribution
TH1D *AliTOFPIDResponse::fHchannelTOFdistr=NULL;  // TOF channel distance distribution

//_________________________________________________________________________
AliTOFPIDResponse::AliTOFPIDResponse(): 
  fSigma(0),
  fPmax(0),         // zero at 0.5 GeV/c for pp
  fTime0(0)
{
  fPar[0] = 0.008;
  fPar[1] = 0.008;
  fPar[2] = 0.002;
  fPar[3] = 40.0;

  if(!fTOFtailResponse){
    fTOFtailResponse = new TF1("fTOFtail","[0]*TMath::Exp(-(x-[1])*(x-[1])/2/[2]/[2])* (x < [1]+[3]*[2]) + (x > [1]+[3]*[2])*[0]*TMath::Exp(-(x-[1]-[3]*[2]*0.5)*[3]/[2] * 0.0111)*0.018",-1000,1000);
    fTOFtailResponse->SetParameter(0,1);
    fTOFtailResponse->SetParameter(1,-26);
    fTOFtailResponse->SetParameter(2,1);
    fTOFtailResponse->SetParameter(3,0.89);
    fTOFtailResponse->SetNpx(10000);
  }
    

  // Reset T0 info
  ResetT0info();
  SetMomBoundary();
}
//_________________________________________________________________________
AliTOFPIDResponse::AliTOFPIDResponse(Double_t *param):
  fSigma(param[0]),
  fPmax(0),          // zero at 0.5 GeV/c for pp
  fTime0(0)
{
  //
  //  The main constructor
  //
  //

  //fPmax=TMath::Exp(-0.5*3*3)/fSigma; // ~3 sigma at 0.5 GeV/c for PbPb 

  fPar[0] = 0.008;
  fPar[1] = 0.008;
  fPar[2] = 0.002;
  fPar[3] = 40.0;

  if(!fTOFtailResponse){
    fTOFtailResponse = new TF1("fTOFtail","[0]*TMath::Exp(-(x-[1])*(x-[1])/2/[2]/[2])* (x < [1]+[3]*[2]) + (x > [1]+[3]*[2])*[0]*TMath::Exp(-(x-[1]-[3]*[2]*0.5)*[3]/[2] * 0.0111)*0.018",-1000,1000);
    fTOFtailResponse->SetParameter(0,1);
    fTOFtailResponse->SetParameter(1,-26);
    fTOFtailResponse->SetParameter(2,1);
    fTOFtailResponse->SetParameter(3,0.89);
    fTOFtailResponse->SetNpx(10000);
  }

  // Reset T0 info
  ResetT0info();
  SetMomBoundary();
}
//_________________________________________________________________________
void AliTOFPIDResponse::SetTOFtail(Float_t tail){
  if(!fTOFtailResponse){
    fTOFtailResponse = new TF1("fTOFtail","[0]*TMath::Exp(-(x-[1])*(x-[1])/2/[2]/[2])* (x < [1]+[3]*[2]) + (x > [1]+[3]*[2])*[0]*TMath::Exp(-(x-[1]-[3]*[2]*0.5)*[3]/[2] * 0.0111)*0.018",-1000,1000);
    fTOFtailResponse->SetParameter(0,1);
    fTOFtailResponse->SetParameter(1,-26);
    fTOFtailResponse->SetParameter(2,1);
    fTOFtailResponse->SetParameter(3,tail);
    fTOFtailResponse->SetNpx(10000);
  }
  else{
    fTOFtailResponse->SetParameter(3,tail);
  }
}
//_________________________________________________________________________
Double_t 
AliTOFPIDResponse::GetMismatchProbability(Double_t time,Double_t eta) const {
  if(!fHmismTOF){
    TFile *fmism = new TFile("$ALICE_ROOT/TOF/data/TOFmismatchDistr.root");
    if(fmism) fHmismTOF = (TH1F *) fmism->Get("TOFmismDistr");
    if(!fHmismTOF){
      printf("I cannot retrive TOF mismatch histos... skipped!");
      return 1E-4;
    }
    fHmismTOF->Scale(TMath::Sqrt(2*TMath::Pi())/(fHmismTOF->Integral(1,fHmismTOF->GetNbinsX()) * fHmismTOF->GetBinWidth(1)));

    TFile *fchDist = new TFile("$ALICE_ROOT/TOF/data/TOFchannelDist.root");
    if(fchDist) fHchannelTOFdistr = (TH1D *) fchDist->Get("hTOFchanDist"); 
    if(!fHchannelTOFdistr){
      printf("I cannot retrive TOF channel distance distribution... skipped!");
      return 1E-4;
    }
  }

  Float_t etaAbs = TMath::Abs(eta);
  Int_t channel = Int_t(4334.09 - 4758.36 * etaAbs -1989.71 * etaAbs*etaAbs + 1957.62*etaAbs*etaAbs*etaAbs);
  if(channel < 1 || etaAbs > 1) channel = 1; 
  Float_t distIP = fHchannelTOFdistr->GetBinContent(channel);
	   
  Double_t mismWeight = fHmismTOF->Interpolate(time - distIP*3.35655419905265973e+01);

  return mismWeight;
}
//_________________________________________________________________________
Double_t AliTOFPIDResponse::GetExpectedSigma(Float_t mom, Float_t time, Float_t mass) const {
  //
  // Return the expected sigma of the PID signal for the specified
  // particle mass/Z.
  // If the operation is not possible, return a negative value.
  //

  Double_t dpp=fPar[0] + fPar[1]*mom + fPar[2]*mass/mom;      //mean relative pt resolution;

 
  Double_t sigma = dpp*time/(1.+ mom*mom/(mass*mass));
  
  Int_t index = GetMomBin(mom);

  Double_t t0res = fT0resolution[index];

  return TMath::Sqrt(sigma*sigma + fPar[3]*fPar[3]/mom/mom + fSigma*fSigma + t0res*t0res);

}
//_________________________________________________________________________
Double_t AliTOFPIDResponse::GetExpectedSigma(Float_t mom, Float_t time, AliPID::EParticleType  type) const {
  //
  // Return the expected sigma of the PID signal for the specified
  // particle type.
  // If the operation is not possible, return a negative value.
  //
  
  Double_t mass = AliPID::ParticleMassZ(type);
  Double_t dpp=fPar[0] + fPar[1]*mom + fPar[2]*mass/mom;      //mean relative pt resolution;

 
  Double_t sigma = dpp*time/(1.+ mom*mom/(mass*mass));
  
  Int_t index = GetMomBin(mom);

  Double_t t0res = fT0resolution[index];

  return TMath::Sqrt(sigma*sigma + fPar[3]*fPar[3]/mom/mom + fSigma*fSigma + t0res*t0res);

}
//_________________________________________________________________________
Double_t AliTOFPIDResponse::GetExpectedSignal(const AliVTrack* track,AliPID::EParticleType type) const {
  //
  // Return the expected signal of the PID signal for the particle type
  // If the operation is not possible, return a negative value.
  //
  Double_t expt[5];
  track->GetIntegratedTimes(expt);
  if (type<=AliPID::kProton) return expt[type];
  else {
    Double_t p = track->P();
    Double_t massZ = AliPID::ParticleMassZ(type);
    return expt[0]/p*massZ*TMath::Sqrt(1.+p*p/massZ/massZ);
  }
}
//_________________________________________________________________________
Int_t AliTOFPIDResponse::GetMomBin(Float_t p) const{
  //
  // Returns the momentum bin index
  //

  Int_t i=0;
  while(p > fPCutMin[i] && i < fNmomBins) i++;
  if(i > 0) i--;

  return i;
}
//_________________________________________________________________________
void AliTOFPIDResponse::SetMomBoundary(){
  //
  // Set boundaries for momentum bins
  //

  fPCutMin[0] = 0.3;
  fPCutMin[1] = 0.5;
  fPCutMin[2] = 0.6;
  fPCutMin[3] = 0.7;
  fPCutMin[4] = 0.8;
  fPCutMin[5] = 0.9;
  fPCutMin[6] = 1;
  fPCutMin[7] = 1.2;
  fPCutMin[8] = 1.5;
  fPCutMin[9] = 2;
  fPCutMin[10] = 3;  
}
//_________________________________________________________________________
Float_t AliTOFPIDResponse::GetStartTime(Float_t mom) const {
  //
  // Returns event_time value as estimated by TOF combinatorial algorithm
  //

  Int_t ibin = GetMomBin(mom);
  return GetT0bin(ibin);

}
//_________________________________________________________________________
Float_t AliTOFPIDResponse::GetStartTimeRes(Float_t mom) const {
  //
  // Returns event_time resolution as estimated by TOF combinatorial algorithm
  //

  Int_t ibin = GetMomBin(mom);
  return GetT0binRes(ibin);

}
//_________________________________________________________________________
Int_t AliTOFPIDResponse::GetStartTimeMask(Float_t mom) const {
  //
  // Returns event_time mask
  //

  Int_t ibin = GetMomBin(mom);
  return GetT0binMask(ibin);

}
//_________________________________________________________________________
Double_t AliTOFPIDResponse::GetTailRandomValue(Float_t pt,Float_t eta,Float_t time,Float_t addmism) // generate a random value to add a tail to TOF time (for MC analyses)
{

  // To add mismatch
  Float_t mismAdd = addmism*0.01;
  if(pt>1.0) mismAdd /= pt;

  if(mismAdd > 0.01){ // apply additional mismatch
    if(gRandom->Rndm() < mismAdd){
      return GetMismatchRandomValue(eta)-time;
    }
  }

  if(fTOFtailResponse)
    return fTOFtailResponse->GetRandom();
  else
    return 0.0;
}
//_________________________________________________________________________
Double_t AliTOFPIDResponse::GetMismatchRandomValue(Float_t eta) // generate a random value for mismatched tracks (for MC analyses)
{
  if(!fHmismTOF){
    TFile *fmism = new TFile("$ALICE_ROOT/TOF/data/TOFmismatchDistr.root");
    if(fmism) fHmismTOF = (TH1F *) fmism->Get("TOFmismDistr");
    if(!fHmismTOF){
      printf("I cannot retrive TOF mismatch histos... skipped!");
      return -10000.;
    }
    fHmismTOF->Scale(TMath::Sqrt(2*TMath::Pi())/(fHmismTOF->Integral(1,fHmismTOF->GetNbinsX()) * fHmismTOF->GetBinWidth(1)));

    TFile *fchDist = new TFile("$ALICE_ROOT/TOF/data/TOFchannelDist.root");
    if(fchDist) fHchannelTOFdistr = (TH1D *) fchDist->Get("hTOFchanDist"); 
    if(!fHchannelTOFdistr){
      printf("I cannot retrive TOF channel distance distribution... skipped!");
      return -10000.;
    }
  }

  Float_t etaAbs = TMath::Abs(eta);
  Int_t channel = Int_t(4334.09 - 4758.36 * etaAbs -1989.71 * etaAbs*etaAbs + 1957.62*etaAbs*etaAbs*etaAbs);
  if(channel < 1 || etaAbs > 1) channel = 1; 
  Float_t distIP = fHchannelTOFdistr->GetBinContent(channel);
	   
  return fHmismTOF->GetRandom() + distIP*3.35655419905265973e+01;
}
//_________________________________________________________________________
Int_t AliTOFPIDResponse::GetTOFchannel(AliVParticle *trk) const{
  Float_t etaAbs = TMath::Abs(trk->Eta());
  Int_t channel = Int_t(4334.09 - 4758.36 * etaAbs -1989.71 * etaAbs*etaAbs + 1957.62*etaAbs*etaAbs*etaAbs);
  if(channel < 1 || etaAbs > 1) channel = 1; 
  
  return channel;
}
Commit	Line	Data
10d100d4	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	//-----------------------------------------------------------------//
	17	// //
	18	// Implementation of the TOF PID class //
	19	// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch //
	20	// //
	21	//-----------------------------------------------------------------//
	22
	23	#include "TMath.h"
	24	#include "AliLog.h"
a2c30af1	25	#include "TF1.h"
3cb11031	26	#include "TH1F.h"
	27	#include "TH1D.h"
	28	#include "TFile.h"
c53e310b	29	#include "TRandom.h"
10d100d4	30
	31	#include "AliTOFPIDResponse.h"
	32
	33	ClassImp(AliTOFPIDResponse)
	34
a2c30af1	35	TF1 *AliTOFPIDResponse::fTOFtailResponse = NULL; // function to generate a TOF tail
3cb11031	36	TH1F *AliTOFPIDResponse::fHmismTOF = NULL; // TOF mismatch distribution
3cb11031	37	TH1D *AliTOFPIDResponse::fHchannelTOFdistr=NULL; // TOF channel distance distribution
a2c30af1	38
10d100d4	39	//_________________________________________________________________________
	40	AliTOFPIDResponse::AliTOFPIDResponse():
	41	fSigma(0),
	42	fPmax(0), // zero at 0.5 GeV/c for pp
	43	fTime0(0)
	44	{
679de35e	45	fPar[0] = 0.008;
	46	fPar[1] = 0.008;
	47	fPar[2] = 0.002;
	48	fPar[3] = 40.0;
95ad1018	49
a2c30af1	50	if(!fTOFtailResponse){
c5fb644a	51	fTOFtailResponse = new TF1("fTOFtail","[0]TMath::Exp(-(x-[1])(x-[1])/2/[2]/[2])* (x < [1]+[3][2]) + (x > [1]+[3][2])[0]TMath::Exp(-(x-[1]-[3][2]0.5)[3]/[2] 0.0111)*0.018",-1000,1000);
a2c30af1	52	fTOFtailResponse->SetParameter(0,1);
c5fb644a	53	fTOFtailResponse->SetParameter(1,-26);
a2c30af1	54	fTOFtailResponse->SetParameter(2,1);
c5fb644a	55	fTOFtailResponse->SetParameter(3,0.89);
a2c30af1	56	fTOFtailResponse->SetNpx(10000);
	57	}
	58
	59
6c68754e	60	// Reset T0 info
	61	ResetT0info();
	62	SetMomBoundary();
10d100d4	63	}
	64	//_________________________________________________________________________
	65	AliTOFPIDResponse::AliTOFPIDResponse(Double_t *param):
	66	fSigma(param[0]),
	67	fPmax(0), // zero at 0.5 GeV/c for pp
	68	fTime0(0)
	69	{
	70	//
	71	// The main constructor
	72	//
	73	//
	74
	75	//fPmax=TMath::Exp(-0.533)/fSigma; // ~3 sigma at 0.5 GeV/c for PbPb
6c68754e	76
679de35e	77	fPar[0] = 0.008;
	78	fPar[1] = 0.008;
	79	fPar[2] = 0.002;
	80	fPar[3] = 40.0;
95ad1018	81
c5fb644a	82	if(!fTOFtailResponse){
	83	fTOFtailResponse = new TF1("fTOFtail","[0]TMath::Exp(-(x-[1])(x-[1])/2/[2]/[2])* (x < [1]+[3][2]) + (x > [1]+[3][2])[0]TMath::Exp(-(x-[1]-[3][2]0.5)[3]/[2] 0.0111)*0.018",-1000,1000);
	84	fTOFtailResponse->SetParameter(0,1);
	85	fTOFtailResponse->SetParameter(1,-26);
	86	fTOFtailResponse->SetParameter(2,1);
	87	fTOFtailResponse->SetParameter(3,0.89);
	88	fTOFtailResponse->SetNpx(10000);
	89	}
	90
6c68754e	91	// Reset T0 info
	92	ResetT0info();
	93	SetMomBoundary();
10d100d4	94	}
10d100d4	95	//_________________________________________________________________________
b3f687a1	96	void AliTOFPIDResponse::SetTOFtail(Float_t tail){
	97	if(!fTOFtailResponse){
	98	fTOFtailResponse = new TF1("fTOFtail","[0]TMath::Exp(-(x-[1])(x-[1])/2/[2]/[2])* (x < [1]+[3][2]) + (x > [1]+[3][2])[0]TMath::Exp(-(x-[1]-[3][2]0.5)[3]/[2] 0.0111)*0.018",-1000,1000);
	99	fTOFtailResponse->SetParameter(0,1);
	100	fTOFtailResponse->SetParameter(1,-26);
	101	fTOFtailResponse->SetParameter(2,1);
	102	fTOFtailResponse->SetParameter(3,tail);
	103	fTOFtailResponse->SetNpx(10000);
	104	}
	105	else{
	106	fTOFtailResponse->SetParameter(3,tail);
	107	}
	108	}
	109	//_________________________________________________________________________
10d100d4	110	Double_t
4fc0f532	111	AliTOFPIDResponse::GetMismatchProbability(Double_t time,Double_t eta) const {
	112	if(!fHmismTOF){
	113	TFile *fmism = new TFile("$ALICE_ROOT/TOF/data/TOFmismatchDistr.root");
	114	if(fmism) fHmismTOF = (TH1F *) fmism->Get("TOFmismDistr");
	115	if(!fHmismTOF){
	116	printf("I cannot retrive TOF mismatch histos... skipped!");
	117	return 1E-4;
	118	}
	119	fHmismTOF->Scale(TMath::Sqrt(2TMath::Pi())/(fHmismTOF->Integral(1,fHmismTOF->GetNbinsX()) fHmismTOF->GetBinWidth(1)));
	120
	121	TFile *fchDist = new TFile("$ALICE_ROOT/TOF/data/TOFchannelDist.root");
	122	if(fchDist) fHchannelTOFdistr = (TH1D *) fchDist->Get("hTOFchanDist");
	123	if(!fHchannelTOFdistr){
	124	printf("I cannot retrive TOF channel distance distribution... skipped!");
	125	return 1E-4;
	126	}
	127	}
10d100d4	128
4fc0f532	129	Float_t etaAbs = TMath::Abs(eta);
	130	Int_t channel = Int_t(4334.09 - 4758.36 * etaAbs -1989.71 * etaAbsetaAbs + 1957.62etaAbsetaAbsetaAbs);
	131	if(channel < 1 \|\| etaAbs > 1) channel = 1;
	132	Float_t distIP = fHchannelTOFdistr->GetBinContent(channel);
	133
	134	Double_t mismWeight = fHmismTOF->Interpolate(time - distIP*3.35655419905265973e+01);
10d100d4	135
4fc0f532	136	return mismWeight;
10d100d4	137	}
	138	//_________________________________________________________________________
	139	Double_t AliTOFPIDResponse::GetExpectedSigma(Float_t mom, Float_t time, Float_t mass) const {
	140	//
	141	// Return the expected sigma of the PID signal for the specified
67376d1d	142	// particle mass/Z.
10d100d4	143	// If the operation is not possible, return a negative value.
	144	//
	145
95ad1018	146	Double_t dpp=fPar[0] + fPar[1]mom + fPar[2]mass/mom; //mean relative pt resolution;
10d100d4	147
	148
	149	Double_t sigma = dpptime/(1.+ mommom/(mass*mass));
6c68754e	150
	151	Int_t index = GetMomBin(mom);
	152
	153	Double_t t0res = fT0resolution[index];
	154
95ad1018	155	return TMath::Sqrt(sigmasigma + fPar[3]fPar[3]/mom/mom + fSigmafSigma + t0rest0res);
10d100d4	156
10d100d4	157	}
6c68754e	158	//_________________________________________________________________________
67376d1d	159	Double_t AliTOFPIDResponse::GetExpectedSigma(Float_t mom, Float_t time, AliPID::EParticleType type) const {
	160	//
	161	// Return the expected sigma of the PID signal for the specified
	162	// particle type.
	163	// If the operation is not possible, return a negative value.
	164	//
	165
	166	Double_t mass = AliPID::ParticleMassZ(type);
	167	Double_t dpp=fPar[0] + fPar[1]mom + fPar[2]mass/mom; //mean relative pt resolution;
	168
	169
	170	Double_t sigma = dpptime/(1.+ mommom/(mass*mass));
	171
	172	Int_t index = GetMomBin(mom);
	173
	174	Double_t t0res = fT0resolution[index];
	175
	176	return TMath::Sqrt(sigmasigma + fPar[3]fPar[3]/mom/mom + fSigmafSigma + t0rest0res);
	177
	178	}
	179	//_________________________________________________________________________
	180	Double_t AliTOFPIDResponse::GetExpectedSignal(const AliVTrack* track,AliPID::EParticleType type) const {
	181	//
	182	// Return the expected signal of the PID signal for the particle type
	183	// If the operation is not possible, return a negative value.
	184	//
	185	Double_t expt[5];
	186	track->GetIntegratedTimes(expt);
	187	if (type<=AliPID::kProton) return expt[type];
	188	else {
	189	Double_t p = track->P();
	190	Double_t massZ = AliPID::ParticleMassZ(type);
	191	return expt[0]/pmassZTMath::Sqrt(1.+p*p/massZ/massZ);
	192	}
	193	}
	194	//_________________________________________________________________________
6c68754e	195	Int_t AliTOFPIDResponse::GetMomBin(Float_t p) const{
f858b00e	196	//
	197	// Returns the momentum bin index
	198	//
	199
6c68754e	200	Int_t i=0;
	201	while(p > fPCutMin[i] && i < fNmomBins) i++;
	202	if(i > 0) i--;
10d100d4	203
6c68754e	204	return i;
	205	}
	206	//_________________________________________________________________________
	207	void AliTOFPIDResponse::SetMomBoundary(){
f858b00e	208	//
	209	// Set boundaries for momentum bins
	210	//
	211
6c68754e	212	fPCutMin[0] = 0.3;
	213	fPCutMin[1] = 0.5;
	214	fPCutMin[2] = 0.6;
	215	fPCutMin[3] = 0.7;
	216	fPCutMin[4] = 0.8;
	217	fPCutMin[5] = 0.9;
	218	fPCutMin[6] = 1;
	219	fPCutMin[7] = 1.2;
	220	fPCutMin[8] = 1.5;
	221	fPCutMin[9] = 2;
	222	fPCutMin[10] = 3;
	223	}
f858b00e	224	//_________________________________________________________________________
7170298c	225	Float_t AliTOFPIDResponse::GetStartTime(Float_t mom) const {
f858b00e	226	//
	227	// Returns event_time value as estimated by TOF combinatorial algorithm
	228	//
	229
	230	Int_t ibin = GetMomBin(mom);
	231	return GetT0bin(ibin);
	232
	233	}
	234	//_________________________________________________________________________
7170298c	235	Float_t AliTOFPIDResponse::GetStartTimeRes(Float_t mom) const {
f858b00e	236	//
	237	// Returns event_time resolution as estimated by TOF combinatorial algorithm
	238	//
	239
	240	Int_t ibin = GetMomBin(mom);
	241	return GetT0binRes(ibin);
	242
	243	}
d4d15b21	244	//_________________________________________________________________________
	245	Int_t AliTOFPIDResponse::GetStartTimeMask(Float_t mom) const {
	246	//
	247	// Returns event_time mask
	248	//
	249
	250	Int_t ibin = GetMomBin(mom);
	251	return GetT0binMask(ibin);
	252
	253	}
a2c30af1	254	//_________________________________________________________________________
c53e310b	255	Double_t AliTOFPIDResponse::GetTailRandomValue(Float_t pt,Float_t eta,Float_t time,Float_t addmism) // generate a random value to add a tail to TOF time (for MC analyses)
a2c30af1	256	{
c53e310b	257
	258	// To add mismatch
	259	Float_t mismAdd = addmism*0.01;
	260	if(pt>1.0) mismAdd /= pt;
	261
	262	if(mismAdd > 0.01){ // apply additional mismatch
	263	if(gRandom->Rndm() < mismAdd){
	264	return GetMismatchRandomValue(eta)-time;
	265	}
	266	}
	267
a2c30af1	268	if(fTOFtailResponse)
	269	return fTOFtailResponse->GetRandom();
	270	else
	271	return 0.0;
	272	}
3cb11031	273	//_________________________________________________________________________
	274	Double_t AliTOFPIDResponse::GetMismatchRandomValue(Float_t eta) // generate a random value for mismatched tracks (for MC analyses)
	275	{
	276	if(!fHmismTOF){
	277	TFile *fmism = new TFile("$ALICE_ROOT/TOF/data/TOFmismatchDistr.root");
	278	if(fmism) fHmismTOF = (TH1F *) fmism->Get("TOFmismDistr");
	279	if(!fHmismTOF){
	280	printf("I cannot retrive TOF mismatch histos... skipped!");
	281	return -10000.;
	282	}
4fc0f532	283	fHmismTOF->Scale(TMath::Sqrt(2TMath::Pi())/(fHmismTOF->Integral(1,fHmismTOF->GetNbinsX()) fHmismTOF->GetBinWidth(1)));
3cb11031	284
	285	TFile *fchDist = new TFile("$ALICE_ROOT/TOF/data/TOFchannelDist.root");
	286	if(fchDist) fHchannelTOFdistr = (TH1D *) fchDist->Get("hTOFchanDist");
	287	if(!fHchannelTOFdistr){
	288	printf("I cannot retrive TOF channel distance distribution... skipped!");
	289	return -10000.;
	290	}
	291	}
	292
	293	Float_t etaAbs = TMath::Abs(eta);
	294	Int_t channel = Int_t(4334.09 - 4758.36 * etaAbs -1989.71 * etaAbsetaAbs + 1957.62etaAbsetaAbsetaAbs);
	295	if(channel < 1 \|\| etaAbs > 1) channel = 1;
	296	Float_t distIP = fHchannelTOFdistr->GetBinContent(channel);
	297
	298	return fHmismTOF->GetRandom() + distIP*3.35655419905265973e+01;
	299	}
c53e310b	300	//_________________________________________________________________________
	301	Int_t AliTOFPIDResponse::GetTOFchannel(AliVParticle *trk) const{
	302	Float_t etaAbs = TMath::Abs(trk->Eta());
	303	Int_t channel = Int_t(4334.09 - 4758.36 * etaAbs -1989.71 * etaAbsetaAbs + 1957.62etaAbsetaAbsetaAbs);
	304	if(channel < 1 \|\| etaAbs > 1) channel = 1;
	305
	306	return channel;
	307	}