1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
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14 **************************************************************************/
22 //*-- Author: Andreas Morsch (CERN)
24 #include "AliEMCALFast.h"
28 ClassImp(AliEMCALFast)
30 //____________________________________________________________________________
33 Float_t AliEMCALFast::SmearMomentum(Int_t ind, Float_t p)
36 // The relative momentum error, i.e.
37 // (delta p)/p = sqrt (a**2 + (b*p)**2) * 10**-2,
38 // where typically a = 0.75 and b = 0.16 - 0.24 depending on multiplicity
39 // (the lower value is for dn/d(eta) about 2000, and the higher one for 8000)
44 if (ind == 2) b = 0.16;
46 Float_t sigma = p*TMath::Sqrt(a*a+b*b*p*p)*0.01;
47 pSmeared = p + gRandom->Gaus(0., sigma);
52 Float_t AliEMCALFast::Efficiency(Int_t ind, Float_t p)
54 // Tracking efficiency:
55 // above pt 0.5 GeV practically constant, between 90 and 95 % (again,
56 // depending on multplicity)
57 // below 0.5 GeV goes down to about 70% at 0.2 GeV.
58 // On top of that there is 90% geometrical acceptance for tracking due
59 // to TPC (dead zones between readout chambers).
64 if (ind == 2) eff = 0.95;
66 eff = eff-(0.5-p)*0.2/0.3;
73 Bool_t AliEMCALFast::EmcalAcceptance(Float_t eta, Float_t phi)
76 // EMCAL eta-phi acceptance
78 if (TMath::Abs(eta) < 0.7 &&
80 phi < 120.*TMath::Pi()/180.)
86 Bool_t AliEMCALFast::RandomReject(Float_t eff)
91 Float_t ran = gRandom->Rndm();
92 if (ran > eff) rej = kTRUE;