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4 * Author: The ALICE Off-line Project. *
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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 //-----------------------------------------------------------------
26 #include "AliITSpidESD.h"
27 #include "AliESDtrack.h"
28 #include "AliExternalTrackParam.h"
30 ClassImp(AliITSpidESD)
33 //______________________________________________________________________
34 AliITSpidESD::AliITSpidESD():TObject(){
39 Double_t AliITSpidESD::Bethe(Double_t p,Double_t mass) {
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);