1 /**************************************************************************
2 * Copyright(c) 1998-2007, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
17 //-------------------------------------------------------------------------
18 // Analysis Task that uses the Soft K-Means Algorithm to find clusters in
19 // the eta-phi space of Minimum Bias. No pt information is used for the clustering.
22 // Author: Andreas Morsch (CERN)
23 // andreas.morsch@cern.ch
24 //-------------------------------------------------------------------------
35 #include "TParticle.h"
36 #include "TParticlePDG.h"
41 #include "AliAnalysisTask.h"
42 #include "AliAnalysisManager.h"
44 #include "AliESDEvent.h"
46 #include "AliESDVertex.h"
47 #include "AliESDInputHandler.h"
48 #include "AliESDtrackCuts.h"
49 #include "AliMultiplicity.h"
51 #include "AliMCParticle.h"
52 #include "AliMCEvent.h"
53 #include "AliAnalysisTaskKMeans.h"
54 #include "AliTrackReference.h"
56 #include "AliHeader.h"
57 #include "AliKMeansClustering.h"
61 ClassImp(AliAnalysisTaskKMeans)
63 AliAnalysisTaskKMeans::AliAnalysisTaskKMeans()
92 //________________________________________________________________________
93 AliAnalysisTaskKMeans::AliAnalysisTaskKMeans(const char *name)
94 : AliAnalysisTaskSE(name)
120 DefineOutput(1, TList::Class());
124 //________________________________________________________________________
125 void AliAnalysisTaskKMeans::UserCreateOutputObjects()
129 fHists = new TList();
130 fH1CEta = new TH1F("fH1CEta", "eta distribution of clusters", 90, -1.5, 1.5);
131 fH1CEtaR = new TH1F("fH1CEtaR", "eta distribution of clusters", 90, -1.5, 1.5);
132 fH1CPhi = new TH1F("fH1CPhi", "phi distribution of clusters", 157, 0.0, 2. * TMath::Pi());
133 fH2N1N2 = new TH2F("fH2N1N2", "multiplicity distribution", 50, 0., 50., 50, 0., 50.);
135 fH1Pt = new TH1F("fH1Pt", "pt distribution",50, 0., 10.);
136 fH1PtC = new TH1F("fH1PtC", "pt distribution",50, 0., 10.);
137 fH1PtC1 = new TH1F("fH1PtC1", "pt distribution",50, 0., 10.);
138 fH1PtC2 = new TH1F("fH1PtC2", "pt distribution",50, 0., 10.);
140 fH1SPt = new TH1F("fH1SPt", "sum pt distribution",50, 0., 10.);
141 fH1SPtC = new TH1F("fH1SPtC", "sum pt distribution",50, 0., 10.);
143 fH1DR = new TH1F("fH1DR", "dR distribution", 50, 0., 5.);
144 fH1DPhi = new TH1F("fH1DPhi", "dPhi distribution", 31, 0., TMath::Pi());
145 fH2DPhiEta = new TH2F("fH2DPhiEta","eta phi distribution", 31, 0., TMath::Pi(), 20, 0., 2.);
146 fH2DPhiEtaR = new TH2F("fH2DPhiEtaR","eta phi distribution", 31, 0., TMath::Pi(), 20, 0., 2.);
147 fH2DPhiEtaL = new TH2F("fH2DPhiEtaL","eta phi distribution", 31, 0., TMath::Pi(), 20, 0., 2.);
148 fH2DPhiEtaLR = new TH2F("fH2DPhiEtaLR","eta phi distribution", 31, 0., TMath::Pi(), 20, 0., 2.);
149 fH2DPhiEtaC = new TH2F("fH2DPhiEtaC","eta phi distribution", 31, 0., TMath::Pi(), 20, 0., 2.);
150 fH2DPhiEtaCR = new TH2F("fH2DPhiEtaCR","eta phi distribution", 31, 0., TMath::Pi(), 20, 0., 2.);
151 fH1DRR = new TH1F("fH1DRR", "dR distribution", 50, 0., 5.);
155 fHists->Add(fH1CEta);
156 fHists->Add(fH1CEtaR);
157 fHists->Add(fH1CPhi);
158 fHists->Add(fH2N1N2);
161 fHists->Add(fH1PtC1);
162 fHists->Add(fH1PtC2);
164 fHists->Add(fH1SPtC);
166 fHists->Add(fH1DPhi);
167 fHists->Add(fH2DPhiEta);
168 fHists->Add(fH2DPhiEtaR);
169 fHists->Add(fH2DPhiEtaL);
170 fHists->Add(fH2DPhiEtaLR);
171 fHists->Add(fH2DPhiEtaC);
172 fHists->Add(fH2DPhiEtaCR);
176 AliKMeansClustering::SetBeta(20.);
180 //________________________________________________________________________
181 void AliAnalysisTaskKMeans::UserExec(Option_t *)
184 // Called for each event
196 Printf("ERROR: fESD not available");
200 AliESDEvent* esdE = (AliESDEvent*) fInputEvent;
204 // Fill eta-phi positions
207 const AliMultiplicity *spdMult = esdE->GetMultiplicity();
208 for (Int_t i = 0; i < spdMult->GetNumberOfTracklets(); ++i) {
209 phi[ic] = spdMult->GetPhi(i);
210 eta[ic] = spdMult->GetEta(i);
217 for (Int_t iTracks = 0; iTracks < esdE->GetNumberOfTracks(); iTracks++) {
218 AliESDtrack* track = esdE->GetTrack(iTracks);
219 if ((fCuts->AcceptTrack(track)))
221 phi[ic] = track->Phi();
222 phiR[ic] = 2. * TMath::Pi() * gRandom->Rndm();
223 eta[ic] = track->Eta();
224 etaR[ic] = 2. * gRandom->Rndm() - 1.;
225 pt[ic] = track->Pt();
226 if (pt[ic] > ptmax) {
241 AliKMeansClustering::SoftKMeans(2, ic, phi, eta, mPhi, mEta, rk);
244 TMath::Sort(2, rk, ind);
248 // Cluster Multiplicity
249 Int_t mult[2] = {0, 0};
251 Double_t dphic = DeltaPhi(mPhi[0], mPhi[1]);
252 Double_t detac = TMath::Abs(mEta[0] - mEta[1]);
253 fH2DPhiEtaC->Fill(dphic, detac);
258 for (Int_t i = 0; i < 1; i++) {
259 fH1CEta->Fill(mEta[ind[i]]);
260 fH1CPhi->Fill(mPhi[ind[i]]);
261 for (Int_t j = 0; j < ic; j++) {
262 Double_t r = DeltaR(mPhi[ind[i]], mEta[ind[i]], phi[j], eta[j]);
263 Double_t dphi = DeltaPhi(mPhi[ind[i]], phi[j]);
264 Double_t deta = mEta[ind[i]] - eta[j];
268 fH2DPhiEta->Fill(dphi, TMath::Abs(deta));
269 if (j == icmax) fH2DPhiEtaL->Fill(dphi, TMath::Abs(deta));
272 fH1PtC2->Fill(pt[j]);
276 fH1PtC1->Fill(pt[j]);
288 if (r > 0.7 && r < 1.) {
294 fH2N1N2->Fill(Float_t(mult[0]), Float_t(mult[1]));
295 fH1SPt ->Fill(sumPt);
296 fH1SPtC->Fill(sumPtC);
301 AliKMeansClustering::SoftKMeans(2, ic, phiR, etaR, mPhi, mEta, rk);
304 TMath::Sort(2, rk, ind);
308 // Cluster Multiplicity
309 for (Int_t i = 0; i < 1; i++) {
310 fH1CEtaR->Fill(mEta[ind[i]]);
313 for (Int_t i = 0; i < 1; i++) {
314 for (Int_t j = 0; j < ic; j++) {
315 Double_t dphi = DeltaPhi(mPhi[ind[i]], phiR[j]);
316 Double_t deta = mEta[ind[i]] - etaR[j];
317 Double_t r = DeltaR(mPhi[ind[i]], mEta[ind[i]], phiR[j], etaR[j]);
319 fH2DPhiEtaR->Fill(dphi, TMath::Abs(deta));
320 if (j == icmax) fH2DPhiEtaLR->Fill(dphi, TMath::Abs(deta));
323 dphic = DeltaPhi(mPhi[0], mPhi[1]);
324 detac = TMath::Abs(mEta[0] - mEta[1]);
325 fH2DPhiEtaCR->Fill(dphic, detac);
333 Double_t AliAnalysisTaskKMeans::DeltaPhi(Double_t phi1, Double_t phi2)
335 Double_t dphi = TMath::Abs(phi1 - phi2);
336 if (dphi > TMath::Pi()) dphi = 2. * TMath::Pi() - dphi;
340 Double_t AliAnalysisTaskKMeans::DeltaR(Double_t phi1, Double_t eta1, Double_t phi2, Double_t eta2)
342 Double_t dphi = DeltaPhi(phi1, phi2);
343 Double_t deta = eta1 - eta2;
344 return (TMath::Sqrt(dphi * dphi + deta * deta));
348 //________________________________________________________________________
349 void AliAnalysisTaskKMeans::Terminate(Option_t *)