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44dbae42 | 1 | /************************************************************************** |
e7d6a389 | 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 | **************************************************************************/ | |
44dbae42 | 15 | |
16 | /* $Id$ */ | |
17 | ||
18 | ////////////////////////////////////////////////////////////////////////// | |
19 | // // | |
20 | // Container for the distributions of dE/dx and the time bin of the // | |
21 | // max. cluster for electrons and pions // | |
22 | // // | |
23 | // Authors: // | |
24 | // Prashant Shukla <shukla@pi0.physi.uni-heidelberg.de> // | |
25 | // Alex Bercuci <a.bercuci@gsi.de> // | |
26 | // // | |
27 | ////////////////////////////////////////////////////////////////////////// | |
28 | ||
44dbae42 | 29 | #include <TFile.h> |
30 | #include <TROOT.h> | |
9ded305e | 31 | #include <TSystem.h> |
44dbae42 | 32 | |
33 | #include "AliLog.h" | |
34 | #include "AliPID.h" | |
35 | ||
9ded305e | 36 | #include "TKDPDF.h" |
44dbae42 | 37 | #include "AliTRDCalPIDLQ.h" |
38 | #include "AliTRDcalibDB.h" | |
39 | ||
40 | ClassImp(AliTRDCalPIDLQ) | |
41 | ||
2e32a5ae | 42 | Float_t AliTRDCalPIDLQ::fgTrackSegLength[kNLength] = { 3.7, 3.9, 4.2, 5.0 }; |
44dbae42 | 43 | |
44 | //_________________________________________________________________________ | |
45 | AliTRDCalPIDLQ::AliTRDCalPIDLQ() | |
46 | :AliTRDCalPID("pid", "LQ PID references for TRD") | |
47 | { | |
48 | // | |
49 | // The Default constructor | |
50 | // | |
51 | ||
1fcc78b7 | 52 | //Init(); |
44dbae42 | 53 | |
54 | } | |
55 | ||
56 | //_________________________________________________________________________ | |
57 | AliTRDCalPIDLQ::AliTRDCalPIDLQ(const Text_t *name, const Text_t *title) | |
58 | :AliTRDCalPID(name,title) | |
59 | { | |
60 | // | |
61 | // The main constructor | |
62 | // | |
63 | ||
64 | Init(); | |
65 | ||
66 | } | |
67 | ||
44dbae42 | 68 | |
69 | //_________________________________________________________________________ | |
70 | Bool_t AliTRDCalPIDLQ::LoadReferences(Char_t *refFile) | |
71 | { | |
72 | // | |
73 | // Read the TRD dEdx histograms. | |
74 | // | |
75 | ||
9ded305e | 76 | if(gSystem->AccessPathName(refFile, kReadPermission)){ |
77 | AliError(Form("File %s.root not readable", refFile)); | |
78 | return kFALSE; | |
e7d6a389 | 79 | } |
9ded305e | 80 | if(!TFile::Open(refFile)){ |
81 | AliError(Form("File %s corrupted", refFile)); | |
44dbae42 | 82 | return kFALSE; |
83 | } | |
9ded305e | 84 | TObjArray *pdf(NULL); |
85 | if (!( pdf = dynamic_cast<TObjArray*>(gFile->Get("PDF_2DLQ")))) { | |
86 | AliError("PID data not available"); | |
87 | return kFALSE; | |
44dbae42 | 88 | } |
9ded305e | 89 | fModel=(TObjArray*)pdf->Clone("PDF"); |
90 | gFile->Close(); | |
44dbae42 | 91 | return kTRUE; |
44dbae42 | 92 | } |
93 | ||
94 | //_________________________________________________________________________ | |
95 | TObject* AliTRDCalPIDLQ::GetModel(Int_t ip, Int_t iType, Int_t iplane) const // iType not needed | |
96 | { | |
97 | // | |
98 | // Returns one selected dEdx histogram | |
99 | // | |
100 | ||
9ded305e | 101 | if (iType < 0 || iType >= AliPID::kSPECIES) return NULL; |
102 | if(ip<0 || ip>= kNMom ) return NULL; | |
44dbae42 | 103 | |
9ded305e | 104 | AliDebug(2, Form("Retrive dEdx distribution for %s @ p=%5.2f [GeV/c].", AliPID::ParticleShortName(iType), fgTrackMomentum[ip])); |
44dbae42 | 105 | return fModel->At(GetModelID(ip, iType, iplane)); |
106 | } | |
107 | ||
108 | //_________________________________________________________________________ | |
1fcc78b7 | 109 | Double_t AliTRDCalPIDLQ::GetProbability(Int_t spec, Float_t mom |
110 | , const Float_t * const dedx | |
111 | , Float_t length, Int_t iplane) const | |
44dbae42 | 112 | { |
113 | // | |
e7d6a389 | 114 | // Core function of AliTRDCalPID class for calculating the |
115 | // likelihood for species "spec" (see AliTRDtrack::kNspecie) of a | |
116 | // given momentum "mom" and a given dE/dx (slice "dedx") yield per | |
117 | // layer | |
44dbae42 | 118 | // |
119 | ||
e7d6a389 | 120 | if (spec < 0 || spec >= AliPID::kSPECIES) return 0.; |
9ded305e | 121 | Double_t x[AliTRDCalPID::kNSlicesLQ]; |
122 | if(!CookdEdx(dedx, x)) return 0.; | |
e7d6a389 | 123 | |
e7d6a389 | 124 | // find the interval in momentum and track segment length which applies for this data |
9ded305e | 125 | /* Int_t ilength = 1; |
2e32a5ae | 126 | while(ilength<kNLength-1 && length>fgTrackSegLength[ilength]){ |
e7d6a389 | 127 | ilength++; |
9ded305e | 128 | }*/ |
e7d6a389 | 129 | Int_t imom = 1; |
2e32a5ae | 130 | while(imom<kNMom-1 && mom>fgTrackMomentum[imom]) imom++; |
44dbae42 | 131 | |
9ded305e | 132 | Double_t p[2], e[2], r; |
133 | TKDPDF *pdf(NULL); | |
134 | ||
135 | AliDebug(2, Form("Looking for %s@p=%6.4f[GeV/c] dEdx={%7.2f %7.2f}[a.u.] l=%4.2f[cm].", AliPID::ParticleShortName(spec), mom, dedx[0], dedx[1], length)); | |
136 | if(!(pdf = dynamic_cast<TKDPDF*>(fModel->At(GetModelID(imom-1, spec, iplane))))) { | |
137 | AliError(Form("Ref data @ idx[%d] not found in DB.", GetModelID(imom-1, spec, iplane))); | |
138 | fModel->ls(); | |
e7d6a389 | 139 | return 0.; |
140 | } | |
a4f67853 | 141 | if(!pdf->GetSize()) pdf->Bootstrap(); |
9ded305e | 142 | pdf->Eval(x, r, e[0], kFALSE); |
143 | p[0]=TMath::Abs(r); // conversion from interpolation to PDF | |
144 | AliDebug(2, Form("LQ=%6.3f+-%5.2f%% @ %4.1f[GeV/c]", p[0], 1.E2*e[0]/p[0], fgTrackMomentum[imom-1])); | |
145 | ||
146 | if(!(pdf = dynamic_cast<TKDPDF*>(fModel->At(GetModelID(imom, spec, iplane))))){ | |
147 | AliError(Form("Ref data @ idx[%d] not found in DB.", GetModelID(imom, spec, iplane))); | |
148 | fModel->ls(); | |
149 | return p[0]; | |
e7d6a389 | 150 | } |
a4f67853 | 151 | if(!pdf->GetSize()) pdf->Bootstrap(); |
9ded305e | 152 | pdf->Eval(x, r, e[1], kFALSE); |
153 | p[1]=TMath::Abs(r); // conversion from interpolation to PDF | |
154 | AliDebug(2, Form("LQ=%6.3f+-%5.2f%% @ %4.1f[GeV/c]", p[1], 1.E2*e[1]/p[1], fgTrackMomentum[imom])); | |
e7d6a389 | 155 | |
9ded305e | 156 | // return interpolation over momentum binning |
157 | if(mom < fgTrackMomentum[0]) return p[0]; | |
158 | else if(mom > fgTrackMomentum[kNMom-1]) return p[1]; | |
159 | else{ | |
160 | Double_t lmom[2] = {fgTrackMomentum[imom-1], fgTrackMomentum[imom]}; | |
161 | return p[0] + (p[1] - p[0])*(mom - lmom[0])/(lmom[1] - lmom[0]); | |
162 | } | |
44dbae42 | 163 | } |
164 | ||
165 | //_________________________________________________________________________ | |
166 | void AliTRDCalPIDLQ::Init() | |
167 | { | |
9ded305e | 168 | // |
169 | // PID LQ list initialization | |
170 | // | |
44dbae42 | 171 | fModel = new TObjArray(AliPID::kSPECIES * kNMom); |
172 | fModel -> SetOwner(); | |
44dbae42 | 173 | } |