Corrected UInt_t <-> Int_t conversion
[u/mrichter/AliRoot.git] / TPC / AliTPCcluster.cxx
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73042f01 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
88cb7938 16/* $Id$ */
73042f01 17
18//-----------------------------------------------------------------
19// Implementation of the TPC cluster class
20//
21// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
22//-----------------------------------------------------------------
23
24#include "AliTPCcluster.h"
25
26ClassImp(AliTPCcluster)
179c6296 27//
75fb37cc 28AliTPCcluster::AliTPCcluster(Int_t *lab, Float_t *hit):
29 AliCluster(0,hit,0.,0.,lab),
30 fQ(0.)
179c6296 31{
32 //
33 // constructor
34 //
35 fQ=hit[4];
36}
37
6d75e4b6 38//____________________________________________________________________________
39Double_t AliTPCcluster::SigmaY2(Double_t r, Double_t tgl, Double_t pt)
40{
41 //
42 // Parametrised error of the cluster reconstruction (pad direction)
43 //
44 // Sigma rphi
45 const Float_t kArphi=0.41818e-2;
46 const Float_t kBrphi=0.17460e-4;
47 const Float_t kCrphi=0.30993e-2;
48 const Float_t kDrphi=0.41061e-3;
49
50 pt=TMath::Abs(pt)*1000.;
51 Double_t x=r/pt;
52 tgl=TMath::Abs(tgl);
53 Double_t s=kArphi - kBrphi*r*tgl + kCrphi*x*x + kDrphi*x;
54 if (s<0.4e-3) s=0.4e-3;
55 s*=1.3; //Iouri Belikov
56
57 return s;
58}
59
60
61//____________________________________________________________________________
62Double_t AliTPCcluster::SigmaZ2(Double_t r, Double_t tgl)
63{
64 //
65 // Parametrised error of the cluster reconstruction (drift direction)
66 //
67 // Sigma z
68 const Float_t kAz=0.39614e-2;
69 const Float_t kBz=0.22443e-4;
70 const Float_t kCz=0.51504e-1;
71
72
73 tgl=TMath::Abs(tgl);
74 Double_t s=kAz - kBz*r*tgl + kCz*tgl*tgl;
75 if (s<0.4e-3) s=0.4e-3;
76 s*=1.3; //Iouri Belikov
77
78 return s;
79}
80