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8df8e382 | 1 | /************************************************************************* |
2 | * Copyright(c) 1998-2009, 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 | // Dielectron PID // | |
18 | // // | |
19 | // // | |
20 | /* | |
21 | Detailed description | |
22 | ||
23 | ||
24 | */ | |
25 | // // | |
26 | /////////////////////////////////////////////////////////////////////////// | |
27 | ||
28 | #include <TMath.h> | |
29 | #include <TF1.h> | |
30 | ||
164bfb53 | 31 | #include <AliVTrack.h> |
8df8e382 | 32 | #include <AliLog.h> |
33 | #include <AliESDtrack.h> | |
34 | ||
35 | #include "AliDielectronVarManager.h" | |
36 | ||
37 | #include "AliDielectronPID.h" | |
38 | ||
39 | ClassImp(AliDielectronPID) | |
40 | ||
41 | AliDielectronPID::AliDielectronPID() : | |
42 | AliAnalysisCuts(), | |
43 | fNcuts(0), | |
8df8e382 | 44 | fESDpid(0x0) |
45 | { | |
46 | // | |
47 | // Default Constructor | |
48 | // | |
49 | for (Int_t icut=0; icut<kNmaxPID; ++icut){ | |
50 | fDetType[icut]=kTPC; | |
51 | fPartType[icut]=AliPID::kPion; | |
52 | fNsigmaLow[icut]=0; | |
53 | fNsigmaUp[icut]=0; | |
54 | fPmin[icut]=0; | |
55 | fPmax[icut]=0; | |
56 | fExclude[icut]=kFALSE; | |
57 | fFunUpperCut[icut]=0x0; | |
58 | fFunLowerCut[icut]=0x0; | |
61d106d3 | 59 | fRequirePIDbit[icut]=0; |
8df8e382 | 60 | } |
61 | } | |
62 | ||
63 | //______________________________________________ | |
64 | AliDielectronPID::AliDielectronPID(const char* name, const char* title) : | |
65 | AliAnalysisCuts(name, title), | |
66 | fNcuts(0), | |
8df8e382 | 67 | fESDpid(0x0) |
68 | { | |
69 | // | |
70 | // Named Constructor | |
71 | // | |
72 | for (Int_t icut=0; icut<kNmaxPID; ++icut){ | |
73 | fDetType[icut]=kTPC; | |
74 | fPartType[icut]=AliPID::kPion; | |
75 | fNsigmaLow[icut]=0; | |
76 | fNsigmaUp[icut]=0; | |
77 | fPmin[icut]=0; | |
78 | fPmax[icut]=0; | |
79 | fExclude[icut]=kFALSE; | |
80 | fFunUpperCut[icut]=0x0; | |
81 | fFunLowerCut[icut]=0x0; | |
61d106d3 | 82 | fRequirePIDbit[icut]=0; |
8df8e382 | 83 | } |
84 | } | |
85 | ||
86 | //______________________________________________ | |
87 | AliDielectronPID::~AliDielectronPID() | |
88 | { | |
89 | // | |
90 | // Default Destructor | |
91 | // | |
92 | } | |
93 | ||
94 | //______________________________________________ | |
95 | void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, Double_t nSigmaLow, Double_t nSigmaUp/*=-99999.*/, | |
61d106d3 | 96 | Double_t pMin/*=0*/, Double_t pMax/*=0*/, Bool_t exclude/*=kFALSE*/, |
97 | UInt_t pidBitType/*=AliDielectronPID::kRequire*/) | |
8df8e382 | 98 | { |
99 | // | |
100 | // Add a pid nsigma cut | |
101 | // use response of detector 'det' in the momentum range ('pMin') to ['pMax'] | |
102 | // use a sigma band betwee 'nSigmaLow' and 'nSigmaUp' | |
103 | // if nSigmaUp==-99999. then nSigmaLow will be uesd as a symmetric band +- nSigmaLow | |
104 | // specify whether to 'exclude' the given band | |
105 | // | |
106 | ||
107 | if (fNcuts==kNmaxPID){ | |
108 | AliError(Form("only %d pid cut ranges allowed",kNmaxPID)); | |
109 | } | |
110 | if (TMath::Abs(nSigmaUp+99999.)<1e-20){ | |
111 | nSigmaUp=TMath::Abs(nSigmaLow); | |
112 | nSigmaLow=-1.*nSigmaUp; | |
113 | } | |
114 | fDetType[fNcuts]=det; | |
115 | fPartType[fNcuts]=type; | |
116 | fNsigmaLow[fNcuts]=nSigmaLow; | |
117 | fNsigmaUp[fNcuts]=nSigmaUp; | |
118 | fPmin[fNcuts]=pMin; | |
119 | fPmax[fNcuts]=pMax; | |
120 | fExclude[fNcuts]=exclude; | |
61d106d3 | 121 | fRequirePIDbit[fNcuts]=pidBitType; |
8df8e382 | 122 | ++fNcuts; |
123 | ||
124 | } | |
125 | ||
126 | //______________________________________________ | |
127 | void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, Double_t nSigmaLow, TF1 * const funUp, | |
61d106d3 | 128 | Double_t pMin/*=0*/, Double_t pMax/*=0*/, Bool_t exclude/*=kFALSE*/, |
129 | UInt_t pidBitType/*=AliDielectronPID::kRequire*/) | |
8df8e382 | 130 | { |
131 | // | |
132 | // cut using a TF1 as upper cut | |
133 | // | |
134 | if (funUp==0x0){ | |
135 | AliError("A valid function is required for the upper cut. Not adding the cut!"); | |
136 | return; | |
137 | } | |
138 | fFunUpperCut[fNcuts]=funUp; | |
61d106d3 | 139 | AddCut(det,type,nSigmaLow,0.,pMin,pMax,exclude,pidBitType); |
8df8e382 | 140 | } |
141 | ||
142 | //______________________________________________ | |
143 | void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, TF1 * const funLow, Double_t nSigmaUp, | |
61d106d3 | 144 | Double_t pMin/*=0*/, Double_t pMax/*=0*/, Bool_t exclude/*=kFALSE*/, |
145 | UInt_t pidBitType/*=AliDielectronPID::kRequire*/) | |
8df8e382 | 146 | { |
147 | // | |
148 | // cut using a TF1 as lower cut | |
149 | // | |
150 | if (funLow==0x0){ | |
151 | AliError("A valid function is required for the lower cut. Not adding the cut!"); | |
152 | return; | |
153 | } | |
154 | fFunLowerCut[fNcuts]=funLow; | |
61d106d3 | 155 | AddCut(det,type,0.,nSigmaUp,pMin,pMax,exclude,pidBitType); |
8df8e382 | 156 | } |
157 | ||
158 | //______________________________________________ | |
159 | void AliDielectronPID::AddCut(DetType det, AliPID::EParticleType type, TF1 * const funLow, TF1 * const funUp, | |
61d106d3 | 160 | Double_t pMin/*=0*/, Double_t pMax/*=0*/, Bool_t exclude/*=kFALSE*/, |
161 | UInt_t pidBitType/*=AliDielectronPID::kRequire*/) | |
8df8e382 | 162 | { |
163 | // | |
164 | // cut using a TF1 as lower and upper cut | |
165 | // | |
166 | if ( (funUp==0x0) || (funLow==0x0) ){ | |
167 | AliError("A valid function is required for upper and lower cut. Not adding the cut!"); | |
168 | return; | |
169 | } | |
170 | fFunUpperCut[fNcuts]=funUp; | |
171 | fFunLowerCut[fNcuts]=funLow; | |
61d106d3 | 172 | AddCut(det,type,0.,0.,pMin,pMax,exclude,pidBitType); |
8df8e382 | 173 | } |
174 | ||
175 | //______________________________________________ | |
176 | Bool_t AliDielectronPID::IsSelected(TObject* track) | |
177 | { | |
178 | // | |
179 | // perform PID cuts | |
180 | // | |
181 | ||
182 | //loop over all cuts | |
164bfb53 | 183 | AliVTrack *part=static_cast<AliVTrack*>(track); |
8df8e382 | 184 | //TODO: Which momentum to use? |
185 | // Different momenta for different detectors? | |
186 | Double_t mom=part->P(); | |
187 | ||
188 | Bool_t selected=kFALSE; | |
189 | fESDpid=AliDielectronVarManager::GetESDpid(); | |
190 | ||
191 | for (UChar_t icut=0; icut<fNcuts; ++icut){ | |
192 | Double_t pMin=fPmin[icut]; | |
193 | Double_t pMax=fPmax[icut]; | |
194 | ||
195 | // test momentum range. In case pMin==pMax use all momenta | |
196 | if ( (TMath::Abs(pMin-pMax)>1e-20) && (mom<=pMin || mom>pMax) ) continue; | |
197 | ||
198 | // test if we are supposed to use a function for the cut | |
199 | if (fFunUpperCut[icut]) fNsigmaUp[icut] =fFunUpperCut[icut]->Eval(mom); | |
200 | if (fFunLowerCut[icut]) fNsigmaLow[icut]=fFunLowerCut[icut]->Eval(mom); | |
201 | ||
202 | switch (fDetType[icut]){ | |
203 | case kITS: | |
204 | selected = IsSelectedITS(part,icut); | |
205 | break; | |
206 | case kTPC: | |
207 | selected = IsSelectedTPC(part,icut); | |
208 | break; | |
209 | case kTRD: | |
210 | selected = IsSelectedTRD(part,icut); | |
211 | break; | |
212 | case kTOF: | |
213 | selected = IsSelectedTOF(part,icut); | |
214 | break; | |
215 | } | |
216 | if (!selected) return kFALSE; | |
217 | } | |
218 | ||
219 | return selected; | |
220 | } | |
221 | ||
222 | //______________________________________________ | |
164bfb53 | 223 | Bool_t AliDielectronPID::IsSelectedITS(AliVTrack * const part, Int_t icut) const |
8df8e382 | 224 | { |
225 | // | |
226 | // ITS part of the PID check | |
227 | // Don't accept the track if there was no pid bit set | |
228 | // | |
229 | Float_t numberOfSigmas=-1000.; | |
230 | ||
164bfb53 | 231 | if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(part->GetStatus()&AliESDtrack::kITSpid)) return kFALSE; |
232 | if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(part->GetStatus()&AliESDtrack::kITSpid)) return kTRUE; | |
233 | ||
8df8e382 | 234 | if (part->IsA()==AliESDtrack::Class()){ |
235 | // ESD case in case the PID bit is not set, don't use this track! | |
236 | AliESDtrack *track=static_cast<AliESDtrack*>(part); | |
8df8e382 | 237 | |
238 | numberOfSigmas=fESDpid->NumberOfSigmasITS(track, fPartType[icut]); | |
239 | }else{ | |
240 | // AOD case | |
241 | // FIXME: Is there a place to check whether the PID is was set in ESD??? | |
242 | AliAODTrack *track=static_cast<AliAODTrack*>(part); | |
243 | numberOfSigmas=NumberOfSigmasITS(track, fPartType[icut]); | |
244 | } | |
245 | Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut]; | |
246 | return selected; | |
247 | } | |
248 | ||
249 | //______________________________________________ | |
164bfb53 | 250 | Bool_t AliDielectronPID::IsSelectedTPC(AliVTrack * const part, Int_t icut) const |
8df8e382 | 251 | { |
252 | // | |
253 | // TPC part of the PID check | |
254 | // Don't accept the track if there was no pid bit set | |
255 | // | |
256 | Float_t numberOfSigmas=-1000.; | |
257 | ||
258 | if (part->IsA()==AliESDtrack::Class()){ | |
259 | // ESD case in case the PID bit is not set, don't use this track! | |
260 | AliESDtrack *track=static_cast<AliESDtrack*>(part); | |
61d106d3 | 261 | if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(track->GetStatus()&AliESDtrack::kTPCpid)) return kFALSE; |
262 | if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(track->GetStatus()&AliESDtrack::kTPCpid)) return kTRUE; | |
8df8e382 | 263 | |
264 | numberOfSigmas=fESDpid->NumberOfSigmasTPC(track, fPartType[icut]); | |
265 | }else{ | |
266 | // AOD case | |
267 | // FIXME: Is there a place to check whether the PID is was set in ESD??? | |
268 | AliAODTrack *track=static_cast<AliAODTrack*>(part); | |
269 | numberOfSigmas=NumberOfSigmasTPC(track, fPartType[icut]); | |
270 | } | |
271 | ||
272 | Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut]; | |
273 | return selected; | |
274 | } | |
275 | ||
276 | //______________________________________________ | |
164bfb53 | 277 | Bool_t AliDielectronPID::IsSelectedTRD(AliVTrack * const /*part*/, Int_t /*icut*/) const |
8df8e382 | 278 | { |
279 | // | |
280 | // TRD part of the pid check | |
281 | // | |
282 | return kFALSE; | |
283 | } | |
284 | ||
285 | //______________________________________________ | |
164bfb53 | 286 | Bool_t AliDielectronPID::IsSelectedTOF(AliVTrack * const part, Int_t icut) const |
8df8e382 | 287 | { |
288 | // | |
289 | // TOF part of the PID check | |
290 | // Don't accept the track if there was no pid bit set | |
291 | // | |
292 | Float_t numberOfSigmas=-1000.; | |
293 | ||
294 | if (part->IsA()==AliESDtrack::Class()){ | |
295 | // ESD case in case the PID bit is not set, don't use this track! | |
296 | AliESDtrack *track=static_cast<AliESDtrack*>(part); | |
61d106d3 | 297 | if (fRequirePIDbit[icut]==AliDielectronPID::kRequire&&!(track->GetStatus()&AliESDtrack::kTOFpid)) return kFALSE; |
298 | if (fRequirePIDbit[icut]==AliDielectronPID::kIfAvailable&&!(track->GetStatus()&AliESDtrack::kTOFpid)) return kTRUE; | |
8df8e382 | 299 | |
300 | numberOfSigmas=fESDpid->NumberOfSigmasTOF(track, fPartType[icut], fESDpid->GetTOFResponse().GetTimeZero()); | |
301 | }else{ | |
302 | // AOD case | |
303 | // FIXME: Is there a place to check whether the PID is was set in ESD??? | |
304 | AliAODTrack *track=static_cast<AliAODTrack*>(part); | |
305 | numberOfSigmas=NumberOfSigmasTOF(track, fPartType[icut]); | |
306 | } | |
307 | ||
308 | Bool_t selected=((numberOfSigmas>=fNsigmaLow[icut])&&(numberOfSigmas<=fNsigmaUp[icut]))^fExclude[icut]; | |
309 | return selected; | |
310 | } | |
311 | ||
312 | //______________________________________________ | |
313 | void AliDielectronPID::SetDefaults(Int_t def){ | |
314 | // | |
315 | // initialise default pid strategies | |
316 | // | |
317 | ||
318 | if (def==0){ | |
319 | // 2sigma bands TPC: | |
320 | // - include e | |
321 | // - exclude mu,K,pi,p | |
322 | // -complete p range | |
323 | AddCut(kTPC,AliPID::kElectron,2); | |
324 | AddCut(kTPC,AliPID::kMuon,-2.,2.,0.,0.,kTRUE); | |
325 | AddCut(kTPC,AliPID::kPion,-2.,2.,0.,0.,kTRUE); | |
326 | AddCut(kTPC,AliPID::kKaon,-2.,2.,0.,0.,kTRUE); | |
327 | AddCut(kTPC,AliPID::kProton,-2.,2.,0.,0.,kTRUE); | |
328 | } else if (def==1) { | |
329 | // 2sigma bands TPC: | |
330 | // - include e 0<p<inf | |
331 | // - exclude mu,K,pi,p 0<p<2 | |
332 | ||
333 | AddCut(kTPC,AliPID::kElectron,2.); | |
334 | AddCut(kTPC,AliPID::kMuon,-2.,2.,0.,2.,kTRUE); | |
335 | AddCut(kTPC,AliPID::kPion,-2.,2.,0.,2.,kTRUE); | |
336 | AddCut(kTPC,AliPID::kKaon,-2.,2.,0.,2.,kTRUE); | |
337 | AddCut(kTPC,AliPID::kProton,-2.,2.,0.,2.,kTRUE); | |
338 | ||
339 | } else if (def==2) { | |
340 | // include 2sigma e TPC | |
341 | // 3sigma bands TOF | |
342 | // - exclude K,P | |
3505bfad | 343 | AddCut(kTPC,AliPID::kElectron,-2.5,4.); |
344 | AddCut(kTPC,AliPID::kPion,-3.,3.,0.,0.,kTRUE); | |
345 | AddCut(kTPC,AliPID::kProton,-3.,3.,0.,0.,kTRUE); | |
8df8e382 | 346 | |
347 | } else if (def==3) { | |
348 | // include 2sigma e TPC | |
349 | // 3sigma bands TOF | |
350 | // - exclude K 0<p<1 | |
351 | // - exclude P 0<p<2 | |
352 | AddCut(kTPC,AliPID::kElectron,2); | |
353 | AddCut(kTOF,AliPID::kKaon,-3.,3.,0.,1.,kTRUE); | |
354 | AddCut(kTOF,AliPID::kProton,-6.,6.,0.,1.,kTRUE); | |
355 | AddCut(kTOF,AliPID::kProton,-3.,3.,1.,2.,kTRUE); | |
356 | ||
357 | } else if (def==4) { | |
358 | // include 2sigma e TPC | |
359 | // 3sigma bands TOF | |
360 | // - exclude K 0<p<1 | |
361 | // - exclude P 0<p<2 | |
362 | AddCut(kTPC,AliPID::kElectron,2.); | |
363 | AddCut(kTOF,AliPID::kKaon,-3.,3.,0.,1.,kTRUE); | |
364 | AddCut(kTOF,AliPID::kProton,-6.,6.,0.,1.,kTRUE); | |
365 | AddCut(kTOF,AliPID::kProton,-3.,3.,1.,2.,kTRUE); | |
8df8e382 | 366 | } else if (def==5) { |
367 | AddCut(kTPC,AliPID::kElectron,-0.5,3); | |
368 | AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5); | |
369 | } else if (def==6) { | |
370 | // lower cut TPC: parametrisation by HFE | |
371 | // upper cut TPC: 3 sigma | |
372 | // TOF ele band 3sigma 0<p<1.5GeV | |
373 | TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)", 0, 100); | |
374 | lowerCut->SetParameters(-2.7,-0.4357); | |
375 | AddCut(kTPC,AliPID::kElectron,lowerCut,3.); | |
376 | AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5); | |
377 | } else if (def==7) { | |
61d106d3 | 378 | // wide TPC cut |
8df8e382 | 379 | // TOF ele band 3sigma 0<p<1.5GeV |
380 | AddCut(kTPC,AliPID::kElectron,10.); | |
381 | AddCut(kTOF,AliPID::kElectron,-3,3,0,1.5); | |
61d106d3 | 382 | } else if (def==8) { |
383 | // TOF 5 sigma inclusion if TOFpid available | |
384 | // this should reduce K,p,Pi to a large extent | |
385 | AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable); | |
386 | } else if (def==9) { | |
387 | // lower cut TPC: parametrisation by HFE | |
388 | // upper cut TPC: 3 sigma | |
389 | // TOF 5 sigma inclusion if TOFpid available | |
390 | // this should reduce K,p,Pi to a large extent | |
391 | TF1 *lowerCut=new TF1("lowerCut", "[0] * TMath::Exp([1]*x)", 0, 100); | |
164bfb53 | 392 | lowerCut->SetParameters(-2.65,-0.6757); |
393 | AddCut(kTPC,AliPID::kElectron,lowerCut,4.); | |
61d106d3 | 394 | AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable); |
395 | } else if (def==10) { | |
396 | AddCut(kTOF,AliPID::kElectron,-5,5,0,200,kFALSE,AliDielectronPID::kIfAvailable); | |
397 | AddCut(kTPC,AliPID::kElectron,3.); | |
398 | AddCut(kTPC,AliPID::kPion,-3.,3.,0.,0.,kTRUE); | |
399 | AddCut(kTPC,AliPID::kProton,-3.,3.,0.,0.,kTRUE); | |
400 | ||
8df8e382 | 401 | } |
402 | } | |
403 |