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 *
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11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
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14 **************************************************************************/
18 //-----------------------------------------------------------------
19 // Implementation of the TPC cluster class
21 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
22 //-----------------------------------------------------------------
24 #include "AliTPCcluster.h"
26 ClassImp(AliTPCcluster)
28 //____________________________________________________________________________
29 Double_t AliTPCcluster::SigmaY2(Double_t r, Double_t tgl, Double_t pt)
32 // Parametrised error of the cluster reconstruction (pad direction)
35 const Float_t kArphi=0.41818e-2;
36 const Float_t kBrphi=0.17460e-4;
37 const Float_t kCrphi=0.30993e-2;
38 const Float_t kDrphi=0.41061e-3;
40 pt=TMath::Abs(pt)*1000.;
43 Double_t s=kArphi - kBrphi*r*tgl + kCrphi*x*x + kDrphi*x;
44 if (s<0.4e-3) s=0.4e-3;
45 s*=1.3; //Iouri Belikov
51 //____________________________________________________________________________
52 Double_t AliTPCcluster::SigmaZ2(Double_t r, Double_t tgl)
55 // Parametrised error of the cluster reconstruction (drift direction)
58 const Float_t kAz=0.39614e-2;
59 const Float_t kBz=0.22443e-4;
60 const Float_t kCz=0.51504e-1;
64 Double_t s=kAz - kBz*r*tgl + kCz*tgl*tgl;
65 if (s<0.4e-3) s=0.4e-3;
66 s*=1.3; //Iouri Belikov