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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" |
11d80e40 | 37 | |
44dbae42 | 38 | #include "AliTRDCalPIDLQ.h" |
39 | #include "AliTRDcalibDB.h" | |
40 | ||
41 | ClassImp(AliTRDCalPIDLQ) | |
42 | ||
2e32a5ae | 43 | Float_t AliTRDCalPIDLQ::fgTrackSegLength[kNLength] = { 3.7, 3.9, 4.2, 5.0 }; |
44dbae42 | 44 | |
45 | //_________________________________________________________________________ | |
46 | AliTRDCalPIDLQ::AliTRDCalPIDLQ() | |
47 | :AliTRDCalPID("pid", "LQ PID references for TRD") | |
48 | { | |
49 | // | |
50 | // The Default constructor | |
51 | // | |
52 | ||
1fcc78b7 | 53 | //Init(); |
44dbae42 | 54 | |
55 | } | |
56 | ||
57 | //_________________________________________________________________________ | |
58 | AliTRDCalPIDLQ::AliTRDCalPIDLQ(const Text_t *name, const Text_t *title) | |
59 | :AliTRDCalPID(name,title) | |
60 | { | |
61 | // | |
62 | // The main constructor | |
63 | // | |
64 | ||
65 | Init(); | |
66 | ||
67 | } | |
68 | ||
44dbae42 | 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); |
11d80e40 | 85 | if (!( pdf = dynamic_cast<TObjArray*>(gFile->Get("PDF_LQ")))) { |
9ded305e | 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 | //_________________________________________________________________________ | |
11d80e40 | 95 | TObject* AliTRDCalPIDLQ::GetModel(Int_t ip, Int_t is, Int_t slices) const |
44dbae42 | 96 | { |
97 | // | |
98 | // Returns one selected dEdx histogram | |
99 | // | |
100 | ||
11d80e40 | 101 | if (is < 0 || is >= AliPID::kSPECIES) return NULL; |
9ded305e | 102 | if(ip<0 || ip>= kNMom ) return NULL; |
44dbae42 | 103 | |
11d80e40 | 104 | AliDebug(2, Form("Retrive dEdx distribution for %s @ p=%5.2f [GeV/c].", AliPID::ParticleShortName(is), fgTrackMomentum[ip])); |
105 | return fModel->At(GetModelID(ip, is, slices)); | |
106 | } | |
107 | ||
108 | //_________________________________________________________________________ | |
109 | Int_t AliTRDCalPIDLQ::GetNrefs() | |
110 | { | |
111 | // Returns the number of PDF distribution | |
112 | return AliTRDCalPID::kNMom*AliPID::kSPECIES*2; | |
44dbae42 | 113 | } |
114 | ||
115 | //_________________________________________________________________________ | |
1fcc78b7 | 116 | Double_t AliTRDCalPIDLQ::GetProbability(Int_t spec, Float_t mom |
117 | , const Float_t * const dedx | |
11d80e40 | 118 | , Float_t length |
119 | , Int_t slices) const | |
44dbae42 | 120 | { |
11d80e40 | 121 | // |
122 | // Core function of AliTRDCalPID class for calculating the | |
123 | // likelihood for species "spec" (see AliTRDtrack::kNspecie) of a | |
124 | // given momentum "mom" and a given dE/dx (slice "dedx") yield per | |
125 | // layer | |
126 | // | |
44dbae42 | 127 | |
e7d6a389 | 128 | if (spec < 0 || spec >= AliPID::kSPECIES) return 0.; |
11d80e40 | 129 | |
130 | Bool_t k2D(slices==2); | |
131 | Double_t x[]={0., 0.}; | |
132 | if(!CookdEdx(dedx, x, k2D)) return 0.; | |
e7d6a389 | 133 | |
e7d6a389 | 134 | // find the interval in momentum and track segment length which applies for this data |
9ded305e | 135 | /* Int_t ilength = 1; |
2e32a5ae | 136 | while(ilength<kNLength-1 && length>fgTrackSegLength[ilength]){ |
e7d6a389 | 137 | ilength++; |
9ded305e | 138 | }*/ |
e7d6a389 | 139 | Int_t imom = 1; |
2e32a5ae | 140 | while(imom<kNMom-1 && mom>fgTrackMomentum[imom]) imom++; |
44dbae42 | 141 | |
9ded305e | 142 | Double_t p[2], e[2], r; |
143 | TKDPDF *pdf(NULL); | |
144 | ||
11d80e40 | 145 | AliDebug(2, Form("Looking %cD for %s@p=%6.4f[GeV/c] log(dEdx)={%7.2f %7.2f}[a.u.] l=%4.2f[cm].", k2D?'2':'1', AliPID::ParticleShortName(spec), mom, x[0], x[1], length)); |
146 | if(!(pdf = dynamic_cast<TKDPDF*>(fModel->At(GetModelID(imom-1, spec, slices))))) { | |
147 | AliError(Form("%cD Ref data @ idx[%d] not found in DB.", k2D?'2':'1', GetModelID(imom-1, spec, slices))); | |
e7d6a389 | 148 | return 0.; |
149 | } | |
a4f67853 | 150 | if(!pdf->GetSize()) pdf->Bootstrap(); |
9ded305e | 151 | pdf->Eval(x, r, e[0], kFALSE); |
152 | p[0]=TMath::Abs(r); // conversion from interpolation to PDF | |
153 | AliDebug(2, Form("LQ=%6.3f+-%5.2f%% @ %4.1f[GeV/c]", p[0], 1.E2*e[0]/p[0], fgTrackMomentum[imom-1])); | |
154 | ||
11d80e40 | 155 | if(!(pdf = dynamic_cast<TKDPDF*>(fModel->At(GetModelID(imom, spec, slices))))){ |
156 | AliError(Form("%cD Ref data @ idx[%d] not found in DB.", k2D?'2':'1', GetModelID(imom, spec, slices))); | |
9ded305e | 157 | return p[0]; |
e7d6a389 | 158 | } |
a4f67853 | 159 | if(!pdf->GetSize()) pdf->Bootstrap(); |
9ded305e | 160 | pdf->Eval(x, r, e[1], kFALSE); |
161 | p[1]=TMath::Abs(r); // conversion from interpolation to PDF | |
162 | AliDebug(2, Form("LQ=%6.3f+-%5.2f%% @ %4.1f[GeV/c]", p[1], 1.E2*e[1]/p[1], fgTrackMomentum[imom])); | |
e7d6a389 | 163 | |
9ded305e | 164 | // return interpolation over momentum binning |
165 | if(mom < fgTrackMomentum[0]) return p[0]; | |
166 | else if(mom > fgTrackMomentum[kNMom-1]) return p[1]; | |
167 | else{ | |
168 | Double_t lmom[2] = {fgTrackMomentum[imom-1], fgTrackMomentum[imom]}; | |
169 | return p[0] + (p[1] - p[0])*(mom - lmom[0])/(lmom[1] - lmom[0]); | |
170 | } | |
44dbae42 | 171 | } |
172 | ||
173 | //_________________________________________________________________________ | |
174 | void AliTRDCalPIDLQ::Init() | |
175 | { | |
9ded305e | 176 | // |
177 | // PID LQ list initialization | |
178 | // | |
11d80e40 | 179 | fModel = new TObjArray(AliPID::kSPECIES * kNMom * 2); |
180 | fModel->SetOwner(); | |
44dbae42 | 181 | } |