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8c6a71ab | 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 | ||
1fad94b4 | 16 | /* $Id$ */ |
17 | ||
8c6a71ab | 18 | //----------------------------------------------------------------- |
19 | // Implementation of the ITS PID class | |
20 | // Very naive one... Should be made better by the detector experts... | |
21 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
22 | //----------------------------------------------------------------- | |
23 | ||
e1e6896f | 24 | #include <TMath.h> |
25 | ||
8c6a71ab | 26 | #include "AliITSpidESD.h" |
8c6a71ab | 27 | #include "AliESDtrack.h" |
b89be497 | 28 | #include "AliExternalTrackParam.h" |
8c6a71ab | 29 | |
30 | ClassImp(AliITSpidESD) | |
31 | ||
8c6a71ab | 32 | |
e62c1aea | 33 | //______________________________________________________________________ |
34 | AliITSpidESD::AliITSpidESD():TObject(){ | |
35 | //Default constructor | |
36 | ||
37 | } | |
8c6a71ab | 38 | |
25fee9b6 | 39 | Double_t AliITSpidESD::Bethe(Double_t p,Double_t mass) { |
b89be497 | 40 | // returns AliExternalTrackParam::BetheBloch normalized to 1 at the minimum |
41 | Double_t density=2.33; // g/cm3 | |
42 | Double_t thickness=0.03; // cm | |
43 | Double_t meanMIPSi=116.24; // keV in 300 microns of Si | |
44 | Double_t conv=density*1E6*thickness/meanMIPSi; | |
45 | Float_t betagamma=p/mass; | |
46 | return conv*AliExternalTrackParam::BetheBlochSolid(betagamma); | |
25fee9b6 | 47 | |
48 | } |