SDigits has become a copy of hits and threshold to associate primary particles has...
[u/mrichter/AliRoot.git] / EMCAL / AliEMCALFast.cxx
CommitLineData
f3c4a6df 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
155f1576 16
17/*
18$Log$
19*/
20
f3c4a6df 21
22//*-- Author: Andreas Morsch (CERN)
23
24#include "AliEMCALFast.h"
25#include <TRandom.h>
26
27
28ClassImp(AliEMCALFast)
29
30//____________________________________________________________________________
31
32
33Float_t AliEMCALFast::SmearMomentum(Int_t ind, Float_t p)
34{
35//
155f1576 36// The relative momentum error, i.e.
37// (delta p)/p = sqrt (a**2 + (b*p)**2) * 10**-2,
f3c4a6df 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)
40//
41 Float_t pSmeared;
42 Float_t a = 0.75;
43 Float_t b = 0.24;
44 if (ind == 2) b = 0.16;
45
46 Float_t sigma = p*TMath::Sqrt(a*a+b*b*p*p)*0.01;
47 pSmeared = p + gRandom->Gaus(0., sigma);
48 return pSmeared;
49}
50
51
52Float_t AliEMCALFast::Efficiency(Int_t ind, Float_t p)
53{
54// Tracking efficiency:
155f1576 55// above pt 0.5 GeV practically constant, between 90 and 95 % (again,
f3c4a6df 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).
60 Float_t eff = 0.;
61// Tracking
62 if (p > 0.5) {
63 eff = 0.9;
64 if (ind == 2) eff = 0.95;
65 } else {
66 eff = eff-(0.5-p)*0.2/0.3;
67 }
155f1576 68 eff *= 0.9;
f3c4a6df 69// Acceptance
70 return eff;
71}
72
155f1576 73Bool_t AliEMCALFast::EmcalAcceptance(Float_t eta, Float_t phi)
74{
75//
76// EMCAL eta-phi acceptance
77 Bool_t acc = kFALSE;
78 if (TMath::Abs(eta) < 0.7 &&
79 phi > 0. &&
80 phi < 120.*TMath::Pi()/180.)
81 acc = kTRUE;
82 return acc;
83}
84
85
86Bool_t AliEMCALFast::RandomReject(Float_t eff)
87{
88//
89// Random rejection
90 Bool_t rej = kFALSE;
91 Float_t ran = gRandom->Rndm();
92 if (ran > eff) rej = kTRUE;
93 return rej;
94}
f3c4a6df 95
96
97
98
99
100
101