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b27a54cf | 1 | // ---------------------------------------------------------------- |
2 | // AliBackgroundSelection | |
3 | // | |
4 | // This class implements to cuts to reject background events from the | |
5 | // samples to be used in the physics analysis: | |
6 | // 1. A linear cut on the correlation cluster vs tracklets | |
7 | // 2. A cut on the delta phi window used by the vertexer Z | |
8 | // The parameters used in both cuts can be set | |
9 | // | |
10 | // The class also produces control histograms for all and accepted | |
11 | // events, for each trigger class present in the data independently. | |
12 | // Histograms are booked on the fly in the UserExec, whenever a new | |
13 | // trigger class is found. | |
14 | // | |
15 | // After the first implementation, it was realized that the deltaphi | |
16 | // cut is more a quality selection cut than an event selection cut, so | |
17 | // it is effectively disabled by default. | |
18 | // | |
19 | // Author: Michele Floris, CERN | |
20 | // ---------------------------------------------------------------- | |
21 | ||
22 | ||
91bea6e7 | 23 | #include "AliBackgroundSelection.h" |
24 | #include "TH2F.h" | |
25 | #include "TList.h" | |
91bea6e7 | 26 | #include "TString.h" |
27 | #include "AliESDInputHandlerRP.h" | |
28 | #include "AliAnalysisManager.h" | |
29 | #include "TTree.h" | |
b27a54cf | 30 | #include "AliMultiplicity.h" |
91bea6e7 | 31 | #ifdef PASS1RECO |
32 | #include "../ITS/AliITSRecPoint.h" | |
33 | #endif | |
b27a54cf | 34 | |
35 | ||
91bea6e7 | 36 | |
37 | ClassImp(AliBackgroundSelection) | |
38 | ||
39 | AliBackgroundSelection::AliBackgroundSelection(): | |
40 | AliAnalysisCuts(), fOutputHist(0), fACut(0), fBCut(0), fDeltaPhiCut(10) | |
41 | { | |
b27a54cf | 42 | // ctor |
91bea6e7 | 43 | fOutputHist = new TList(); |
44 | fOutputHist->SetOwner(); | |
45 | fACut = 65; | |
46 | fBCut = 4; | |
47 | fDeltaPhiCut = 10; // effectively disabling delta phi cut by default | |
48 | } | |
49 | ||
50 | AliBackgroundSelection::AliBackgroundSelection(const char* name, const char* title): | |
51 | AliAnalysisCuts(name,title), fOutputHist(0), fACut(0), fBCut(0), fDeltaPhiCut(10) | |
52 | { | |
b27a54cf | 53 | // ctor |
91bea6e7 | 54 | fOutputHist = new TList(); |
55 | fOutputHist->SetOwner(); | |
56 | fACut = 65; | |
57 | fBCut = 4; | |
58 | fDeltaPhiCut = 10; // effectively disabling delta phi cut by default | |
59 | ||
60 | } | |
61 | ||
62 | AliBackgroundSelection::AliBackgroundSelection(const AliBackgroundSelection& obj) : AliAnalysisCuts(obj), | |
63 | fOutputHist(0), fACut(0), fBCut(0), fDeltaPhiCut(0) | |
64 | { | |
b27a54cf | 65 | // copy ctor |
91bea6e7 | 66 | fOutputHist = obj.fOutputHist; |
67 | fACut = obj.fACut; | |
68 | fBCut = obj.fBCut; | |
69 | fDeltaPhiCut = obj.fDeltaPhiCut; | |
70 | } | |
71 | ||
72 | AliBackgroundSelection::~AliBackgroundSelection() { | |
b27a54cf | 73 | // dtor |
91bea6e7 | 74 | if(fOutputHist) { |
75 | delete fOutputHist; | |
76 | fOutputHist = 0; | |
77 | } | |
78 | ||
79 | } | |
80 | ||
b27a54cf | 81 | Bool_t AliBackgroundSelection::IsSelected(TObject* const obj) |
91bea6e7 | 82 | { |
b27a54cf | 83 | // returns false if the event is identifiead as beam background, |
84 | // true otherwise. | |
91bea6e7 | 85 | |
86 | // reset fSelected | |
87 | SetSelected(kFALSE); | |
88 | #ifdef PASS1RECO | |
89 | // Get rec points | |
90 | AliESDInputHandlerRP* handlerRP = dynamic_cast<AliESDInputHandlerRP*> (AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler()); | |
91 | if (!handlerRP) | |
92 | AliFatal("Cannot get the AliESDInputHandlerRP"); | |
93 | ||
94 | TTree* itsClusterTree = handlerRP->GetTreeR("ITS"); | |
95 | if (!itsClusterTree){ | |
96 | AliError("Cannot get the ITS Cluster tree"); | |
97 | return kFALSE; | |
98 | } | |
99 | // AliFatal("Cannot get the ITS Cluster tree"); | |
100 | ||
101 | TClonesArray* itsClusters = new TClonesArray("AliITSRecPoint"); | |
102 | TBranch* itsClusterBranch=itsClusterTree->GetBranch("ITSRecPoints"); | |
103 | ||
104 | itsClusterBranch->SetAddress(&itsClusters); | |
105 | ||
106 | Int_t nItsSubs = (Int_t)itsClusterTree->GetEntries(); | |
107 | #endif | |
108 | ||
109 | AliESDEvent * esdEv = (AliESDEvent*) obj; | |
110 | ||
111 | #ifdef PASS1RECO | |
112 | Float_t deltaPhi = 0.0; // deltaPhi is not available in pass1 | |
113 | ||
114 | // Get # spd clusters and of tracklets | |
115 | Int_t spdClusters=0; | |
116 | ||
117 | ||
118 | // loop over the its subdetectors | |
119 | for (Int_t iIts=0; iIts < nItsSubs; iIts++) { | |
120 | ||
121 | if (!itsClusterTree->GetEvent(iIts)) | |
122 | continue; | |
123 | ||
124 | Int_t nClusters = itsClusters->GetEntriesFast(); | |
125 | ||
126 | // loop over clusters | |
127 | while (nClusters--) { | |
128 | AliITSRecPoint* cluster = (AliITSRecPoint*) itsClusters->UncheckedAt(nClusters); | |
129 | ||
130 | Int_t layer = cluster->GetLayer(); | |
131 | ||
132 | if (layer < 3) { // SPD | |
133 | spdClusters++; | |
134 | } | |
135 | } | |
136 | } | |
137 | #endif | |
138 | ||
139 | const AliMultiplicity* mult = esdEv->GetMultiplicity(); | |
140 | if (!mult){ | |
141 | AliFatal("No multiplicity object"); // TODO: Should this be fatal? | |
142 | } | |
143 | Int_t ntracklet = mult->GetNumberOfTracklets(); | |
144 | ||
145 | #ifndef PASS1RECO | |
146 | // get deltaphi if vertexer z | |
147 | Float_t deltaPhi = 0.0; | |
148 | // Get Vertex | |
149 | const AliESDVertex * vtxESD = esdEv->GetPrimaryVertexSPD(); | |
150 | if(vtxESD) { | |
151 | if (vtxESD->IsFromVertexerZ()) deltaPhi = vtxESD->GetDispersion(); // dispersion contains deltaphi in case of vertexer Z | |
152 | } | |
153 | else { | |
154 | AliWarning("No Vertex"); | |
155 | } | |
156 | ||
157 | ||
158 | ||
159 | // compute number of spd clusters | |
160 | Float_t spdClusters = 0; | |
161 | for(Int_t ilayer = 0; ilayer < 2; ilayer++){ | |
162 | spdClusters += mult->GetNumberOfITSClusters(ilayer); | |
163 | } | |
164 | #endif | |
165 | ||
166 | // Check cuts | |
167 | Bool_t isCvsTOk = kFALSE; | |
168 | Bool_t isDeltaPhiOk = kFALSE; | |
169 | ||
170 | Float_t limit = fACut + ntracklet * fBCut; | |
171 | if (spdClusters > limit) isCvsTOk = kFALSE; | |
172 | else isCvsTOk = kTRUE ; | |
173 | ||
174 | if(deltaPhi > fDeltaPhiCut) isDeltaPhiOk = kFALSE; | |
175 | else isDeltaPhiOk = kTRUE ; | |
176 | ||
177 | if (!isCvsTOk || !isDeltaPhiOk) SetSelected(kFALSE); | |
178 | else SetSelected(kTRUE ); | |
179 | ||
180 | // Fill control histos for all trigger classes | |
181 | TString trgClasses = esdEv->GetFiredTriggerClasses(); | |
182 | TObjArray * tokens = trgClasses.Tokenize(" "); | |
183 | TIter iter(tokens); | |
184 | while(TObjString * tok = (TObjString*) iter.Next()){ | |
185 | // clean up trigger name | |
186 | TString trg = tok->GetString(); | |
187 | trg.Strip(TString::kTrailing, ' '); | |
188 | trg.Strip(TString::kLeading, ' '); | |
189 | ||
190 | // cluster vs tracklets | |
191 | TH2F * hCvsT = GetClusterVsTrackletsHisto(trg.Data()); | |
192 | TH2F * hCvsTa = GetClusterVsTrackletsHistoAccepted(trg.Data()); | |
193 | hCvsT->Fill(ntracklet,spdClusters); | |
194 | if(isCvsTOk) hCvsTa->Fill(ntracklet,spdClusters); | |
195 | ||
196 | // Delta phi | |
197 | TH1F * hDeltaPhi = GetDeltaPhiHisto(trg.Data()); | |
198 | TH1F * hDeltaPhia = GetDeltaPhiHistoAccepted(trg.Data()); | |
199 | hDeltaPhi->Fill(deltaPhi); | |
200 | if(isDeltaPhiOk) hDeltaPhia->Fill(deltaPhi); | |
201 | } | |
202 | if(tokens) delete tokens; | |
203 | // return decision | |
204 | ||
205 | #ifdef PASS1RECO | |
206 | if(itsClusters) { | |
207 | itsClusters->Delete(); | |
208 | delete itsClusters; | |
209 | } | |
210 | #endif | |
211 | return Selected(); | |
212 | } | |
213 | ||
214 | ||
215 | void AliBackgroundSelection::Init(){ | |
216 | ||
b27a54cf | 217 | // Set default cut values |
91bea6e7 | 218 | fACut = 65; |
219 | fBCut = 4; | |
220 | ||
221 | } | |
222 | ||
223 | ||
224 | void AliBackgroundSelection::BookClusterVsTrackletsHisto(const char * trigger_name){ | |
225 | ||
b27a54cf | 226 | // Book control histogram for the cut on the correlation cluster vs tracklets |
227 | ||
91bea6e7 | 228 | Bool_t oldStatus = TH1::AddDirectoryStatus(); |
229 | TH1::AddDirectory(kFALSE); | |
230 | ||
ce08cb1f | 231 | TH2F * h1 = new TH2F(GetClusterVsTrackletsHistoName(trigger_name),trigger_name, 300, -0.5, 2999.5, 1000, -0.5, 9999.5); |
91bea6e7 | 232 | h1->SetXTitle("Tracklets"); |
233 | h1->SetYTitle("SPD Clusters"); | |
234 | AliInfo(Form("Creating histos: %s, all and accepted", GetClusterVsTrackletsHistoName(trigger_name))); | |
235 | ||
236 | TH2F * h2 = new TH2F(GetClusterVsTrackletsHistoNameAccepted(trigger_name),TString(trigger_name)+ "(accepted)", | |
ce08cb1f | 237 | 300, -0.5, 2999.5, 1000, -0.5, 9999.5); |
91bea6e7 | 238 | h2->SetXTitle("Tracklets"); |
239 | h2->SetYTitle("SPD Clusters"); | |
240 | ||
241 | fOutputHist->Add(h1); | |
242 | fOutputHist->Add(h2); | |
243 | ||
244 | TH1::AddDirectory(oldStatus); | |
245 | ||
246 | } | |
247 | ||
248 | void AliBackgroundSelection::BookDeltaPhiHisto(const char * trigger_name){ | |
249 | ||
b27a54cf | 250 | // Book control histogram for the cut on the DeltaPhi window used by vertexer Z |
251 | ||
91bea6e7 | 252 | Bool_t oldStatus = TH1::AddDirectoryStatus(); |
253 | TH1::AddDirectory(kFALSE); | |
254 | ||
255 | TH1F * h1 = new TH1F(GetDeltaPhiHistoName(trigger_name),trigger_name, 100,0,0.5); | |
256 | h1->SetXTitle("#Delta #phi"); | |
257 | AliInfo(Form("Creating histos: %s, all and accepted", GetDeltaPhiHistoName(trigger_name))); | |
258 | ||
259 | TH1F * h2 = new TH1F(GetDeltaPhiHistoNameAccepted(trigger_name),TString(trigger_name)+ "(accepted)", 100,0,0.5); | |
260 | h2->SetXTitle("#Delta #phi"); | |
261 | ||
262 | ||
263 | fOutputHist->Add(h1); | |
264 | fOutputHist->Add(h2); | |
265 | ||
266 | TH1::AddDirectory(oldStatus); | |
267 | ||
268 | } | |
269 | ||
270 | TH2F * AliBackgroundSelection::GetClusterVsTrackletsHisto(const char * trigger_name){ | |
b27a54cf | 271 | |
272 | // Returns the control histogram corresponding to a given trigger | |
273 | // class. If it does not exist, it creates it and adds it to the | |
274 | // output list | |
275 | // All Events | |
276 | ||
91bea6e7 | 277 | if(!fOutputHist) {AliError("List of histos not initialized");return 0;} |
278 | TH2F * h = (TH2F*) fOutputHist->FindObject(GetClusterVsTrackletsHistoName(trigger_name)); | |
279 | if(!h) { | |
280 | BookClusterVsTrackletsHisto(trigger_name); | |
281 | h = (TH2F*) fOutputHist->FindObject(GetClusterVsTrackletsHistoName(trigger_name)); | |
282 | } | |
283 | return h; | |
284 | } | |
285 | TH1F * AliBackgroundSelection::GetDeltaPhiHisto(const char * trigger_name){ | |
b27a54cf | 286 | |
287 | // Returns the control histogram corresponding to a given trigger | |
288 | // class. If it does not exist, it creates it and adds it to the | |
289 | // output list | |
290 | // All Events | |
291 | ||
91bea6e7 | 292 | if(!fOutputHist) {AliError("List of histos not initialized");return 0;} |
293 | TH1F * h = (TH1F*) fOutputHist->FindObject(GetDeltaPhiHistoName(trigger_name)); | |
294 | if(!h) { | |
295 | BookDeltaPhiHisto(trigger_name); | |
296 | h = (TH1F*) fOutputHist->FindObject(GetDeltaPhiHistoName(trigger_name)); | |
297 | } | |
298 | return h; | |
299 | } | |
300 | ||
301 | TH2F * AliBackgroundSelection::GetClusterVsTrackletsHistoAccepted(const char * trigger_name){ | |
302 | ||
b27a54cf | 303 | // Returns the control histogram corresponding to a given trigger |
304 | // class. If it does not exist, it creates it and adds it to the | |
305 | // output list | |
306 | // Events passing the cut only | |
307 | ||
91bea6e7 | 308 | if(!fOutputHist) {AliError("List of histos not initialized");return 0;} |
309 | TH2F * h = (TH2F*) fOutputHist->FindObject(GetClusterVsTrackletsHistoNameAccepted(trigger_name)); | |
310 | if(!h) { | |
311 | BookClusterVsTrackletsHisto(trigger_name); | |
312 | h = (TH2F*) fOutputHist->FindObject(GetClusterVsTrackletsHistoNameAccepted(trigger_name)); | |
313 | } | |
314 | return h; | |
315 | ||
316 | } | |
317 | ||
318 | TH1F * AliBackgroundSelection::GetDeltaPhiHistoAccepted(const char * trigger_name){ | |
319 | ||
b27a54cf | 320 | // Returns the control histogram corresponding to a given trigger |
321 | // class. If it does not exist, it creates it and adds it to the | |
322 | // output list | |
323 | // Events passing the cut only | |
324 | ||
91bea6e7 | 325 | if(!fOutputHist) {AliError("List of histos not initialized");return 0;} |
326 | TH1F * h = (TH1F*) fOutputHist->FindObject(GetDeltaPhiHistoNameAccepted(trigger_name)); | |
327 | if(!h) { | |
328 | BookDeltaPhiHisto(trigger_name); | |
329 | h = (TH1F*) fOutputHist->FindObject(GetDeltaPhiHistoNameAccepted(trigger_name)); | |
330 | } | |
331 | return h; | |
332 | ||
333 | } | |
334 | ||
335 | const char * AliBackgroundSelection::GetClusterVsTrackletsHistoName(const char * trigger_name){ | |
b27a54cf | 336 | |
337 | // build up the name of the cluster vs tracklets histo using the trigger class | |
338 | ||
91bea6e7 | 339 | static TString str; |
340 | str = ("hCvsT"); | |
341 | str = str+GetName()+"_"+trigger_name; | |
342 | return str.Data(); | |
343 | } | |
344 | ||
345 | const char * AliBackgroundSelection::GetClusterVsTrackletsHistoNameAccepted(const char * trigger_name){ | |
b27a54cf | 346 | |
347 | // build up the name of the cluster vs tracklets histo using the trigger class (accepted events) | |
91bea6e7 | 348 | static TString str; |
349 | str = ("hCvsT"); | |
350 | str = str+GetName()+"_"+trigger_name + "_accepted"; | |
351 | return str.Data(); | |
352 | } | |
353 | ||
354 | const char * AliBackgroundSelection::GetDeltaPhiHistoName(const char * trigger_name){ | |
b27a54cf | 355 | |
356 | // build up the name of the delta phi histo using the trigger class | |
357 | ||
358 | ||
91bea6e7 | 359 | static TString str; |
360 | str = ("hDeltaPhi"); | |
361 | str = str+GetName()+"_"+trigger_name; | |
362 | return str.Data(); | |
363 | } | |
364 | ||
365 | const char * AliBackgroundSelection::GetDeltaPhiHistoNameAccepted(const char * trigger_name){ | |
b27a54cf | 366 | |
367 | // build up the name of the delta phi histo using the trigger class (accepted events) | |
368 | ||
91bea6e7 | 369 | static TString str; |
370 | str = ("hDeltaPhi"); | |
371 | str = str+GetName()+"_"+trigger_name + "_accepted"; | |
372 | return str.Data(); | |
373 | } | |
374 | ||
b27a54cf | 375 | Long64_t AliBackgroundSelection::Merge(TCollection* const list) |
91bea6e7 | 376 | { |
377 | // Merge a list of AliBackgroundSelection objects with this (needed for | |
378 | // PROOF). | |
379 | // Returns the number of merged objects (including this). | |
380 | ||
381 | // We have to make sure that all the list contain the same histos in | |
382 | // the same order. We thus also have to sort the list (sorting is | |
383 | // done by name in TList). | |
384 | ||
0c6c629b | 385 | //AliInfo("Merging"); |
91bea6e7 | 386 | |
387 | if (!list) | |
388 | return 0; | |
389 | ||
390 | if (list->IsEmpty()) | |
391 | return 1; | |
392 | ||
393 | TIterator* iter = list->MakeIterator(); | |
394 | TObject* obj; | |
395 | ||
396 | // collections of all histograms | |
397 | const Int_t nHists = 1; | |
398 | TList collections[nHists]; | |
399 | ||
400 | Int_t count = 0; | |
401 | // 1. Sort this list | |
402 | fOutputHist->Sort(); | |
403 | ||
404 | while ((obj = iter->Next())) { | |
405 | Bool_t foundDiffinThisIterStep = kFALSE; | |
406 | // Printf("%d - %s",count, obj->GetName()); | |
407 | AliBackgroundSelection* entry = dynamic_cast<AliBackgroundSelection*> (obj); | |
408 | if (entry == 0) | |
409 | continue; | |
410 | ||
411 | TList * hlist = entry->fOutputHist; | |
412 | ||
413 | // Check if all histos in this fOutputHist are also in the one from entry and viceversa | |
414 | // Use getters to automatically book non defined histos | |
415 | ||
416 | Bool_t areListsDifferent=kTRUE; | |
417 | Int_t iloop = 0; | |
b27a54cf | 418 | Int_t maxLoops = hlist->GetSize() + fOutputHist->GetSize(); // In the worst case all of the histos will be different... |
91bea6e7 | 419 | while(areListsDifferent) { |
b27a54cf | 420 | if(iloop>maxLoops) AliFatal("Infinite Loop?"); |
91bea6e7 | 421 | iloop++; |
422 | // sort | |
423 | hlist->Sort(); | |
424 | fOutputHist->Sort(); | |
425 | // loop over the largest | |
426 | ||
427 | // loop over the largest | |
428 | TObject * hist =0; | |
429 | TIterator * iterlist = 0; | |
430 | TList * thislist = 0; // the list over which I'm iterating (i.e. the largest) | |
431 | TList * otherlist = 0; // the other list | |
432 | ||
433 | if (hlist->GetSize() >= fOutputHist->GetSize()) { | |
434 | thislist = hlist; | |
435 | otherlist = fOutputHist; | |
436 | } | |
437 | else{ | |
438 | thislist = fOutputHist; | |
439 | otherlist = hlist; | |
440 | } | |
441 | iterlist = thislist->MakeIterator(); | |
442 | ||
443 | while ((hist= iterlist->Next())){ | |
444 | if(!otherlist->FindObject(hist->GetName())){ | |
0c6c629b | 445 | //AliInfo(Form("Adding object %s",hist->GetName())); |
91bea6e7 | 446 | foundDiffinThisIterStep = kTRUE; |
447 | TH1 * hclone = (TH1*) hist->Clone(); | |
448 | hclone->Reset(); | |
449 | otherlist->Add(hclone); | |
450 | } | |
451 | } | |
452 | ||
8663e267 | 453 | delete iterlist; |
91bea6e7 | 454 | // re-sort before checking |
455 | hlist->Sort(); | |
456 | fOutputHist->Sort(); | |
457 | ||
458 | // check if everything is fine | |
459 | areListsDifferent=kFALSE; | |
460 | if (hlist->GetSize() == fOutputHist->GetSize()) { | |
461 | Int_t nhist = fOutputHist->GetSize(); | |
462 | for(Int_t ihist = 0; ihist < nhist; ihist++){ | |
463 | if(strcmp(fOutputHist->At(ihist)->GetName(),hlist->At(ihist)->GetName())) areListsDifferent = kTRUE; | |
464 | } | |
465 | } else { | |
466 | areListsDifferent=kTRUE; | |
467 | } | |
468 | } | |
469 | ||
470 | // last check: if something is not ok die loudly | |
471 | if (hlist->GetSize() != fOutputHist->GetSize()) { | |
472 | AliFatal("Mismatching size!"); | |
473 | } | |
474 | Int_t nhist = fOutputHist->GetSize(); | |
475 | for(Int_t ihist = 0; ihist < nhist; ihist++){ | |
476 | if(strcmp(fOutputHist->At(ihist)->GetName(),hlist->At(ihist)->GetName())){ | |
477 | AliFatal(Form("Mismatching histos: %s -> %s", fOutputHist->At(ihist)->GetName(),hlist->At(ihist)->GetName())); | |
478 | } | |
479 | } | |
480 | ||
481 | if (foundDiffinThisIterStep){ | |
482 | iter->Reset(); // We found a difference: previous lists could | |
483 | // also be affected... We start from scratch | |
484 | Int_t n = 0; | |
485 | collections[n++].Clear(); | |
486 | count = 0; | |
487 | } | |
488 | else { | |
489 | // AliInfo("hlist"); | |
490 | // hlist->Print(); | |
491 | // AliInfo("fOutputHist"); | |
492 | // fOutputHist->Print(); | |
493 | ||
494 | Int_t n = 0; | |
495 | collections[n++].Add(hlist); | |
496 | ||
497 | count++; | |
498 | } | |
499 | } | |
500 | ||
501 | Int_t n = 0; | |
502 | fOutputHist->Merge(&collections[n++]); | |
503 | ||
504 | delete iter; | |
505 | ||
506 | return count+1; | |
507 | } | |
508 | ||
509 |