7 #include "TLorentzVector.h"
10 #include "AliESDEvent.h"
11 #include "AliESDVertex.h"
12 #include "AliESDtrack.h"
14 #include "AliMCEvent.h"
16 #include "AliRsnAnalysisPhi900GeV.h"
19 AliRsnAnalysisPhi900GeV::AliRsnAnalysisPhi900GeV(const char *name) :
20 AliAnalysisTaskSE(name),
38 fTOFSettings(AliRsnTOFT0maker::kNone)
44 DefineOutput(1, TTree::Class());
45 DefineOutput(2, TTree::Class());
46 DefineOutput(3, TList::Class());
50 AliRsnAnalysisPhi900GeV::AliRsnAnalysisPhi900GeV(const AliRsnAnalysisPhi900GeV& copy) :
51 AliAnalysisTaskSE(copy),
62 fMinTPC(copy.fMinTPC),
63 fMaxTPC(copy.fMaxTPC),
66 fTOFESD(copy.fTOFESD),
67 fTOFSigma(copy.fTOFSigma),
69 fTOFSettings(copy.fTOFSettings)
77 AliRsnAnalysisPhi900GeV& AliRsnAnalysisPhi900GeV::operator=(const AliRsnAnalysisPhi900GeV& copy)
80 // Assignment operator
90 fMinTPC = copy.fMinTPC;
91 fMaxTPC = copy.fMaxTPC;
93 fTOFESD = copy.fTOFESD;
94 fTOFSigma = copy.fTOFSigma;
95 fTOFSettings = copy.fTOFSettings;
101 AliRsnAnalysisPhi900GeV::~AliRsnAnalysisPhi900GeV()
107 if (fOutTree[0]) delete fOutTree[0];
108 if (fOutTree[1]) delete fOutTree[1];
112 void AliRsnAnalysisPhi900GeV::UserCreateOutputObjects()
115 // Create the output data container
119 fTOFmaker = new AliRsnTOFT0maker;
120 fTOFmaker->SetTimeResolution(fTOFSigma * 1E-12);
121 fTOFmaker->SetESDdata(fTOFESD);
122 fTOFmaker->fSettings = fTOFSettings;
123 AliInfo(Form("TOF sigma = %f", fTOFSigma));
124 AliInfo(Form("TOF ESD = %s", (fTOFESD ? "YES" : "NO")));
125 AliInfo(Form("TOF settings = %s", fTOFmaker->Settings().Data()));
127 // load dead channel map
128 fTOFmaker->LoadChannelMap("tofmap.root");
129 fTOFmaker->SetMaskOffChannel();
134 // create output trees
136 fOutTree[0] = new TTree("rsnTree", "Pairs");
138 fOutTree[0]->Branch("pdg", &fPDG, "pdg/S");
139 fOutTree[0]->Branch("im" , &fIM , "im/F" );
140 fOutTree[0]->Branch("y" , &fY , "y/F" );
141 fOutTree[0]->Branch("pt" , &fPt , "pt/F" );
142 fOutTree[0]->Branch("eta", &fEta, "eta/F");
145 fOutTree[1] = new TTree("rsnTrue", "True pairs");
147 fOutTree[1]->Branch("im" , &fIM , "im/F" );
148 fOutTree[1]->Branch("y" , &fY , "y/F" );
149 fOutTree[1]->Branch("pt" , &fPt , "pt/F" );
150 fOutTree[1]->Branch("eta", &fEta, "eta/F");
153 fOutList = new TList;
154 fHEvents = new TH1I("hEvents", "Event details", 4, 0, 4);
155 fOutList->Add(fHEvents);
159 void AliRsnAnalysisPhi900GeV::UserExec(Option_t *)
162 // Main execution function.
163 // Fills the fHEvents data member with the following legenda:
164 // 0 -- event OK, prim vertex with tracks
165 // 1 -- event OK, prim vertex with SPD
166 // 2 -- event OK but vz large
170 // retrieve ESD event and related stack (if available)
171 AliESDEvent *esd = dynamic_cast<AliESDEvent*>(fInputEvent);
172 AliStack *stack = (fMCEvent ? fMCEvent->Stack() : 0x0);
174 // get the best primary vertex:
175 // first try the one with tracks
177 const AliESDVertex *v = esd->GetPrimaryVertexTracks();
178 if(v->GetNContributors() < 1)
180 // if not good, try SPD vertex
182 v = esd->GetPrimaryVertexSPD();
184 // if this is not good skip this event
185 if (v->GetNContributors() < 1)
188 PostData(3, fOutList);
193 // if the Z position is larger than 10, skip this event
194 if (TMath::Abs(v->GetZv()) > 10.0)
197 PostData(3, fOutList);
201 // use the type to fill the histogram
202 fHEvents->Fill(type);
204 // smear TOF times in case of MC
205 if (stack) RemakeTOFtimeMC(esd);
207 // get time zero for TOF
208 Double_t *tof = fTOFmaker->RemakePID(esd);
210 ProcessESD(esd, v, tof[0], stack);
213 PostData(3, fOutList);
217 void AliRsnAnalysisPhi900GeV::Terminate(Option_t *)
225 void AliRsnAnalysisPhi900GeV::ProcessESD
226 (AliESDEvent *esd, const AliESDVertex *v, Double_t time0, AliStack *stack)
229 // This function works with the ESD object
232 // prepare to look on all tracks to select the ones
233 // which pass all the cuts
234 Int_t ntracks = esd->GetNumberOfTracks();
235 TArrayI pos(ntracks);
236 TArrayI neg(ntracks);
238 // define fixed functions for TOF compatibility range
239 Double_t a1 = 0.01, a2 = -0.03;
240 Double_t b1 = 0.25, b2 = 0.25;
241 Double_t c1 = 0.05, c2 = -0.03;
244 // loop on all tracks
245 Int_t i, charge, nSPD, npos = 0, nneg = 0;
246 Float_t chi2, b[2], bCov[3];
247 Double_t tpc, bb, mom, tofTime, tofRef, tofRel, times[10];
249 for (i = 0; i < ntracks; i++)
251 AliESDtrack *track = esd->GetTrack(i);
252 if (!track) continue;
254 // skip if it has not the required flags
255 if (!track->IsOn(AliESDtrack::kTPCin)) continue;
256 if (!track->IsOn(AliESDtrack::kTPCrefit)) continue;
257 if (!track->IsOn(AliESDtrack::kITSrefit)) continue;
259 // skip if it has not the TPC inner wall projection
260 if (!track->GetInnerParam()) continue;
262 // skip kink daughters
263 if ((Int_t)track->GetKinkIndex(0) > 0) continue;
265 // check clusters in TPC
266 if (track->GetTPCclusters(0) < fNTPC) continue;
269 chi2 = (Float_t)track->GetTPCchi2();
270 chi2 /= (Float_t)track->GetTPCclusters(0);
271 if (chi2 > fChi2) continue;
273 // check that has at least 1 SPD cluster
275 if (track->HasPointOnITSLayer(0)) nSPD++;
276 if (track->HasPointOnITSLayer(1)) nSPD++;
277 if (nSPD < 1) continue;
279 // check primary by reverting to vertex
281 if (!track->RelateToVertex(v, esd->GetMagneticField(), kVeryBig)) continue;
282 track->GetImpactParameters(b, bCov);
283 if (b[0] > fDCAr) continue;
284 if (b[1] > fDCAz) continue;
287 AliExternalTrackParam trackIn(*track->GetInnerParam());
289 tpc = (Double_t)track->GetTPCsignal();
291 tpc = (tpc - bb) / bb;
292 if (tpc < fMinTPC || tpc > fMaxTPC) continue;
294 // if possible, check TOF
296 if (track->IsOn(AliESDtrack::kTOFpid))
303 track->GetIntegratedTimes(times);
304 tofTime = (Double_t)track->GetTOFsignal() - time0;
305 tofRef = times[AliPID::kKaon];
306 tofRel = (tofTime - tofRef) / tofRef;
307 ymax = a1 / (mom - b1) + c1;
308 ymin = a2 / (mom - b2) + c2;
309 okTOF = (tofRel >= ymin && tofRel <= ymax);
312 if (!okTOF) continue;
314 // if we arrive here, all cuts were passed
315 // and we add the track to one array depending on charge
316 charge = (Int_t)track->Charge();
323 // resize arrays accordingly
327 // loop to compute invariant mass
328 Int_t ip, in, lp, ln;
330 Double_t kmass = pid.ParticleMass(AliPID::kKaon);
331 Double_t phimass = 1.019455;
332 TParticle *partp = 0x0, *partn = 0x0;
333 AliESDtrack *tp = 0x0, *tn = 0x0;
334 TLorentzVector vp, vn, vsum, vref;
335 for (ip = 0; ip < npos; ip++)
337 tp = esd->GetTrack(pos[ip]);
338 lp = TMath::Abs(tp->GetLabel());
339 if (stack) partp = stack->Particle(lp);
341 for (in = 0; in < nneg; in++)
343 if (pos[ip] == neg[in]) continue;
344 tn = esd->GetTrack(neg[in]);
345 ln = TMath::Abs(tn->GetLabel());
346 if (stack) partn = stack->Particle(ln);
351 if (partp->GetFirstMother() == partn->GetFirstMother())
353 if (partp->GetFirstMother() > 0)
355 TParticle *mum = stack->Particle(partp->GetFirstMother());
356 fPDG = mum->GetPdgCode();
360 fPDG = TMath::Abs(fPDG);
362 vp.SetXYZM(tp->Px(), tp->Py(), tp->Pz(), kmass);
363 vn.SetXYZM(tn->Px(), tn->Py(), tn->Pz(), kmass);
365 vref.SetXYZM(vsum.X(), vsum.Y(), vsum.Z(), phimass);
367 fIM = (Float_t)vsum.M();
368 fPt = (Float_t)vsum.Perp();
369 fEta = (Float_t)vsum.Eta();
370 fY = (Float_t)vref.Rapidity();
376 PostData(1, fOutTree[0]);
380 void AliRsnAnalysisPhi900GeV::ProcessMC(AliStack *stack)
383 // Function to process stack only
387 Int_t nPart = stack->GetNtrack();
389 // loop to compute invariant mass
392 Double_t kmass = pid.ParticleMass(AliPID::kKaon);
393 Double_t phimass = 1.019455;
394 TParticle *partp = 0x0, *partn = 0x0;
395 TLorentzVector vp, vn, vsum, vref;
397 for (ip = 0; ip < nPart; ip++)
399 partp = stack->Particle(ip);
400 if (partp->GetPdgCode() != 321) continue;
402 for (in = 0; in < nPart; in++)
404 partn = stack->Particle(in);
405 if (partn->GetPdgCode() != -321) continue;
408 if (partp->GetFirstMother() == partn->GetFirstMother())
410 if (partp->GetFirstMother() > 0)
412 TParticle *mum = stack->Particle(partp->GetFirstMother());
413 fPDG = mum->GetPdgCode();
416 fPDG = TMath::Abs(fPDG);
417 if (fPDG != 333) continue;
419 vp.SetXYZM(partp->Px(), partp->Py(), partp->Pz(), kmass);
420 vn.SetXYZM(partn->Px(), partn->Py(), partn->Pz(), kmass);
422 vref.SetXYZM(vsum.X(), vsum.Y(), vsum.Z(), phimass);
424 fIM = (Float_t)vsum.M();
425 fPt = (Float_t)vsum.Perp();
426 fEta = (Float_t)vsum.Eta();
427 fY = (Float_t)vref.Rapidity();
433 PostData(2, fOutTree[1]);
437 void AliRsnAnalysisPhi900GeV::SetTPCparams(Bool_t isMC)
440 // Set TPC bethe-bloch parameters
445 fTPCpar[0] = 1.41543;
446 fTPCpar[1] = 2.63394E1;
447 fTPCpar[2] = 5.0411E-11;
448 fTPCpar[3] = 2.12543;
449 fTPCpar[4] = 4.88663;
453 fTPCpar[0] = 2.15898;
454 fTPCpar[1] = 1.75295E1;
455 fTPCpar[2] = 3.40030E-9;
456 fTPCpar[3] = 1.96178;
457 fTPCpar[4] = 3.91720;
462 Double_t AliRsnAnalysisPhi900GeV::AlephBB(Double_t p, Double_t mass)
465 // Compute expected Bethe-Bloch for that momentum and mass
468 if (mass < 1E-6) return 0.0;
470 Double_t aa, bb, out, beta, bg;
473 beta = bg / TMath::Sqrt(1.0 + bg * bg);
474 aa = TMath::Power(beta, fTPCpar[3]);
475 bb = TMath::Power(1./bg, fTPCpar[4]);
476 bb = TMath::Log(fTPCpar[2] + bb);
477 out = (fTPCpar[1] - aa - bb) * fTPCpar[0]/aa;
483 Double_t AliRsnAnalysisPhi900GeV::RemakeTOFtimeMC(AliESDEvent *& esd)
486 // Smear initial time for TOF in order to reproduce data resolution
489 Double_t t0 = gRandom->Gaus(0,135.); //spread in ps
490 Int_t ntracks = esd->GetNumberOfTracks();
491 Double_t sigmaStandard = 80.; // 80 ps from TOF
495 AliESDtrack *t = esd->GetTrack(ntracks);
496 if ((t->GetStatus()&AliESDtrack::kTOFout) == 0 || (t->GetStatus()&AliESDtrack::kTIME)==0) continue;
497 Double_t time = t->GetTOFsignal();
498 if(fTOFSigma > sigmaStandard)
500 Double_t sigmaAdded = TMath::Sqrt(fTOFSigma*fTOFSigma - sigmaStandard*sigmaStandard);
501 Double_t timerandomtrack = gRandom->Gaus(0, sigmaAdded); //spread in ps
502 time += timerandomtrack;
505 t->SetTOFsignal(time);