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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 | ||
16 | //----------------------------------------------------------------- | |
17 | // Implementation of the ITS PID class | |
18 | // Very naive one... Should be made better by the detector experts... | |
19 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
20 | //----------------------------------------------------------------- | |
21 | ||
22 | #include "AliITSpidESD.h" | |
8c6a71ab | 23 | #include "AliESDtrack.h" |
24 | ||
25 | ClassImp(AliITSpidESD) | |
26 | ||
8c6a71ab | 27 | |
e62c1aea | 28 | //______________________________________________________________________ |
29 | AliITSpidESD::AliITSpidESD():TObject(){ | |
30 | //Default constructor | |
31 | ||
32 | } | |
8c6a71ab | 33 | Double_t AliITSpidESD::Bethe(Double_t bg) { |
34 | // | |
35 | // This is the Bethe-Bloch function normalised to 1 at the minimum | |
36 | // | |
37 | Double_t bg2=bg*bg; | |
431be10d | 38 | Double_t bethe; |
ca75fe5f | 39 | /*if (bg<3.5) |
40 | bethe=(1.+ bg2)/bg2*(log(5940*bg2) - bg2/(1.+ bg2)); | |
41 | else*/ // not 100% clear why... | |
42 | bethe=(1.+ bg2)/bg2*(log(3.5*5940*bg) - bg2/(1.+ bg2)); | |
8c6a71ab | 43 | return bethe/11.091; |
44 | } | |
45 |