Add dielectron framework to PWG3
[u/mrichter/AliRoot.git] / PWG3 / dielectron / AliDielectron.cxx
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b2a297fa 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 Analysis Main class //
18// //
19/*
20Framework to perform event selectoin, single track selection and track pair
21selection.
22
23Convention for the signs of the pair in fPairCandidates:
24The names are available via the function PairClassName(Int_t i)
25
260: ev1+ ev1+ (same event like sign +)
271: ev1+ ev1- (same event unlike sign)
282: ev1- ev1- (same event like sign -)
29
303: ev1+ ev2+ (mixed event like sign +)
314: ev1- ev2+ (mixed event unlike sign -+)
326: ev1+ ev2- (mixed event unlike sign +-)
337: ev1- ev2- (mixed event like sign -)
34
355: ev2+ ev2+ (same event like sign +)
368: ev2+ ev2- (same event unlike sign)
379: ev2- ev2- (same event like sign -)
38
39
40
41*/
42// //
43///////////////////////////////////////////////////////////////////////////
44
45#include <TString.h>
46#include <TList.h>
47#include <TMath.h>
48
49#include <AliESDEvent.h>
50#include <AliESDtrack.h>
51
52#include <AliVEvent.h>
53#include <AliVParticle.h>
54#include <AliVTrack.h>
55#include "AliDielectronPair.h"
56#include "AliDielectronHistos.h"
57#include "AliDielectronCF.h"
58#include "AliDielectronMC.h"
59#include "AliDielectronVarManager.h"
60#include "AliDielectron.h"
61
62ClassImp(AliDielectron)
63
64const char* AliDielectron::fgkTrackClassNames[4] = {
65 "ev1+",
66 "ev1-",
67 "ev2+",
68 "ev2-"
69};
70
71const char* AliDielectron::fgkPairClassNames[10] = {
72 "ev1+_ev1+",
73 "ev1+_ev1-",
74 "ev1-_ev1-",
75 "ev1+_ev2+",
76 "ev1-_ev2+",
77 "ev2+_ev2+",
78 "ev1+_ev2-",
79 "ev1-_ev2-",
80 "ev2+_ev2-",
81 "ev2-_ev2-"
82};
83
84//________________________________________________________________
85AliDielectron::AliDielectron() :
86 TNamed("AliDielectron","AliDielectron"),
87 fEventFilter("EventFilter"),
88 fTrackFilter("TrackFilter"),
89 fPairFilter("PairFilter"),
90 fPdgMother(443),
91 fHistos(0x0),
92 fPairCandidates(new TObjArray(10)),
93 fCfManagerPair(0x0)
94{
95 //
96 // Default constructor
97 //
98
99}
100
101//________________________________________________________________
102AliDielectron::AliDielectron(const char* name, const char* title) :
103 TNamed(name,title),
104 fEventFilter("EventFilter"),
105 fTrackFilter("TrackFilter"),
106 fPairFilter("PairFilter"),
107 fPdgMother(443),
108 fHistos(0x0),
109 fPairCandidates(new TObjArray(10)),
110 fCfManagerPair(0x0)
111{
112 //
113 // Named constructor
114 //
115
116}
117
118//________________________________________________________________
119AliDielectron::~AliDielectron()
120{
121 //
122 // Default destructor
123 //
124 if (fHistos) delete fHistos;
125 if (fPairCandidates) delete fPairCandidates;
126}
127
128//________________________________________________________________
129void AliDielectron::Init()
130{
131 //
132 // Initialise objects
133 //
134 if (fCfManagerPair) fCfManagerPair->InitialiseContainer(fPairFilter);
135}
136
137//________________________________________________________________
138void AliDielectron::Process(AliVEvent *ev1, AliVEvent *ev2)
139{
140 //
141 // Process the events
142 //
143
144 //in case we have MC load the MC event and process the MC particles
145 if (AliDielectronMC::Instance()->ConnectMCEvent()) ProcessMC();
146
147 //if candidate array doesn't exist, create it
148 if (!fPairCandidates->UncheckedAt(0)) {
149 InitPairCandidateArrays();
150 } else {
151 ClearArrays();
152 }
153
154 //mask used to require that all cuts are fulfilled
155 UInt_t selectedMask=(1<<fEventFilter.GetCuts()->GetEntries())-1;
156
157 //apply event cuts
158 if (ev1&&fEventFilter.IsSelected(ev1)!=selectedMask ||
159 ev2&&fEventFilter.IsSelected(ev2)!=selectedMask) return;
160
161 //fill track arrays for the first event
162 if (ev1) FillTrackArrays(ev1);
163
164 //fill track arrays for the second event
165 if (ev2) FillTrackArrays(ev2,1);
166
167 // create pairs and fill pair candidate arrays
168 for (Int_t itrackArr1=0; itrackArr1<4; ++itrackArr1){
169 for (Int_t itrackArr2=itrackArr1; itrackArr2<4; ++itrackArr2){
170 FillPairArrays(itrackArr1, itrackArr2);
171 }
172 }
173}
174
175//________________________________________________________________
176void AliDielectron::ProcessMC()
177{
178 //
179 // Process the MC data
180 //
181
182 //loop over all MC data and Fill the CF container if it exist
183 if (!fCfManagerPair) return;
184 fCfManagerPair->SetPdgMother(fPdgMother);
185
186 AliDielectronMC *dieMC=AliDielectronMC::Instance();
187 for (Int_t ipart=0; ipart<dieMC->GetNMCTracks();++ipart){
188 //TODO: MC truth cut properly!!!
189 AliVParticle *mcPart=dieMC->GetMCTrackFromMCEvent(ipart);
190 if (!AliDielectronMC::Instance()->IsMCMotherToEE(mcPart, fPdgMother)) continue;
191 fCfManagerPair->FillMC(mcPart);
192 }
193}
194
195//________________________________________________________________
196void AliDielectron::FillHistograms()
197{
198 //
199 // Fill Histogram information for tracks and pairs
200 //
201
202 if (!fHistos) return;
203 TString className;
204
205 //Fill track information, separately for the track array candidates
206 Double_t trackValues[AliDielectronVarManager::kNMaxValues];
207 for (Int_t i=0; i<4; ++i){
208 className.Form("Track_%s",fgkTrackClassNames[i]);
209 Int_t ntracks=fTracks[i].GetEntriesFast();
210 for (Int_t itrack=0; itrack<ntracks; ++itrack){
211 AliDielectronVarManager::Fill(fTracks[i].UncheckedAt(itrack), trackValues);
212 fHistos->FillClass(className, AliDielectronVarManager::kNMaxValues, trackValues);
213 }
214 }
215
216 //Fill Pair information, separately for all pair candidate arrays
217 Double_t pairValues[AliDielectronVarManager::kNMaxValues];
218 for (Int_t i=0; i<10; ++i){
219 className.Form("Pair_%s",fgkPairClassNames[i]);
220 Int_t ntracks=PairArray(i)->GetEntriesFast();
221 for (Int_t ipair=0; ipair<ntracks; ++ipair){
222 AliDielectronVarManager::Fill(PairArray(i)->UncheckedAt(ipair), pairValues);
223 fHistos->FillClass(className, AliDielectronVarManager::kNMaxValues, pairValues);
224 }
225 }
226
227}
228
229//________________________________________________________________
230void AliDielectron::FillTrackArrays(AliVEvent * const ev, Int_t eventNr)
231{
232 //
233 // select tracks and fill track candidate arrays
234 // eventNr = 0: First event, use track arrays 0 and 1
235 // eventNr = 1: Second event, use track arrays 2 and 3
236 //
237
238 Int_t ntracks=ev->GetNumberOfTracks();
239 UInt_t selectedMask=(1<<fTrackFilter.GetCuts()->GetEntries())-1;
240 for (Int_t itrack=0; itrack<ntracks; ++itrack){
241 //get particle
242 AliVParticle *particle=ev->GetTrack(itrack);
243 //TODO: temporary solution, perhaps think about a better implementation
244 // This is needed to use AliESDpidCuts, which relies on the ESD event
245 // is set as a AliESDtrack attribute... somehow ugly!
246 if (ev->IsA()==AliESDEvent::Class()){
247 AliESDtrack *track=static_cast<AliESDtrack*>(particle);
248 track->SetESDEvent(static_cast<AliESDEvent*>(ev)); //only in trunk...
249 }
250
251 //apply track cuts
252 if (fTrackFilter.IsSelected(particle)!=selectedMask) continue;
253
254 //fill selected particle into the corresponding track arrays
255 Short_t charge=particle->Charge();
256 if (charge>0) fTracks[eventNr*2].Add(particle);
257 else if (charge<0) fTracks[eventNr*2+1].Add(particle);
258 }
259}
260
261//________________________________________________________________
262void AliDielectron::FillPairArrays(Int_t arr1, Int_t arr2) {
263 //
264 // select pairs and fill pair candidate arrays
265 //
266 Int_t pairIndex=GetPairIndex(arr1,arr2);
267
268 Int_t ntrack1=fTracks[arr1].GetEntriesFast();
269 Int_t ntrack2=fTracks[arr2].GetEntriesFast();
270
271 AliDielectronPair *candidate=new AliDielectronPair;
272
273 UInt_t selectedMask=(1<<fPairFilter.GetCuts()->GetEntries())-1;
274
275 for (Int_t itrack1=0; itrack1<ntrack1; ++itrack1){
276 Int_t end=ntrack2;
277 if (arr1==arr2) end=itrack1;
278 for (Int_t itrack2=0; itrack2<end; ++itrack2){
279 //create the pair TODO: change hardcoded PID of tracks
280 candidate->SetTracks(static_cast<AliVTrack*>(fTracks[arr1].UncheckedAt(itrack1)), 11,
281 static_cast<AliVTrack*>(fTracks[arr2].UncheckedAt(itrack2)), 11);
282 candidate->SetType(pairIndex);
283
284 //pair cuts
285 UInt_t cutMask=fPairFilter.IsSelected(candidate);
286
287 //CF manager for the pair
288 if (fCfManagerPair) fCfManagerPair->Fill(cutMask,candidate);
289
290 //apply cut
291 if (cutMask!=selectedMask) continue;
292
293 //add the candidate to the candidate array
294 PairArray(pairIndex)->Add(candidate);
295 //get a new candidate
296 candidate=new AliDielectronPair;
297 }
298 }
299 //delete the surplus candidate
300 delete candidate;
301}
302
303
304
305