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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 | ||
26 | ClassImp(AliTPCcluster) | |
179c6296 | 27 | // |
75fb37cc | 28 | AliTPCcluster::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 | //____________________________________________________________________________ |
39 | Double_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 | //____________________________________________________________________________ | |
62 | Double_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 |