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9e4cc50d | 1 | |
7c679be0 | 2 | // ************************************************************************** |
3 | // * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
4 | // * * | |
5 | // * Author: The ALICE Off-line Project. * | |
6 | // * Contributors are mentioned in the code where appropriate. * | |
7 | // * * | |
8 | // * Permission to use, copy, modify and distribute this software and its * | |
9 | // * documentation strictly for non-commercial purposes is hereby granted * | |
10 | // * without fee, provided that the above copyright notice appears in all * | |
11 | // * copies and that both the copyright notice and this permission notice * | |
12 | // * appear in the supporting documentation. The authors make no claims * | |
13 | // * about the suitability of this software for any purpose. It is * | |
14 | // * provided "as is" without express or implied warranty. * | |
15 | // ************************************************************************** | |
16 | ||
17 | //----------------------------------------------------------------------------------- | |
18 | // Jet finder based on Deterministic Annealing | |
19 | // For further informations about the DA working features see: | |
20 | // Phys.Lett. B601 (2004) 56-63 (http://arxiv.org/abs/hep-ph/0407214) | |
21 | // Author: Davide Perrino (davide.perrino@ba.infn.it, davide.perrino@cern.ch) | |
22 | //----------------------------------------------------------------------------------- | |
23 | ||
24 | #include <TMath.h> | |
25 | #include <TRandom.h> | |
26 | #include <TClonesArray.h> | |
36b5cc43 | 27 | #include "AliJetReaderHeader.h" |
7c679be0 | 28 | #include "AliJetReader.h" |
29 | #include "AliDAJetHeader.h" | |
30 | #include "AliDAJetFinder.h" | |
31 | ||
7c679be0 | 32 | ClassImp(AliDAJetFinder) |
33 | ||
34 | ||
35 | //----------------------------------------------------------------------------------- | |
36 | AliDAJetFinder::AliDAJetFinder(): | |
36b5cc43 | 37 | AliJetFinder(), |
7c679be0 | 38 | fAlpha(1.01), |
39 | fDelta(1e-8), | |
40 | fAvDist(1e-6), | |
41 | fEps(1e-4), | |
42 | fEpsMax(1e-2), | |
43 | fNloopMax(100), | |
44 | fBeta(0.1), | |
45 | fNclustMax(0), | |
9e4cc50d | 46 | fNin(0) |
7c679be0 | 47 | { |
48 | // Constructor | |
49 | } | |
50 | ||
51 | //----------------------------------------------------------------------------------- | |
52 | AliDAJetFinder::~AliDAJetFinder() | |
53 | { | |
54 | // Destructor | |
7c679be0 | 55 | } |
56 | ||
57 | //----------------------------------------------------------------------------------- | |
58 | void AliDAJetFinder::FindJets() | |
59 | { | |
60 | // Find the jets in current event | |
61 | // | |
62 | Float_t betaStop=100.; | |
63 | ||
64 | Double_t dEtSum=0; | |
36b5cc43 | 65 | Double_t *xData[2]; |
66 | TVectorD *vPx = new TVectorD(); | |
67 | TVectorD *vPy = new TVectorD(); | |
68 | TMatrixD *mPyx= new TMatrixD(); | |
69 | TMatrixD *mY = new TMatrixD(); | |
70 | InitDetAnn(dEtSum,xData,vPx,vPy,mPyx,mY); | |
7c679be0 | 71 | if (!fNin) return; |
72 | ||
36b5cc43 | 73 | Int_t nc=1, nk; |
74 | DoubleClusters(nc,nk,vPy,mY); | |
7c679be0 | 75 | do{ //loop over beta |
76 | fBeta*=fAlpha; | |
36b5cc43 | 77 | Annealing(nk,xData,vPx,vPy,mPyx,mY); |
78 | NumCl(nc,nk,vPy,mPyx,mY); | |
7c679be0 | 79 | }while((fBeta<betaStop || nc<4) && nc<fNclustMax); |
80 | ||
81 | Int_t *xx=new Int_t[fNin]; | |
36b5cc43 | 82 | EndDetAnn(nk,xData,xx,dEtSum,vPx,vPy,mPyx,mY); |
83 | StoreJets(nk,xData,xx,mY); | |
7c679be0 | 84 | delete [] xx; |
85 | ||
36b5cc43 | 86 | delete [] xData[0], delete [] xData[1]; |
87 | delete mPyx; | |
88 | delete mY; | |
89 | delete vPx; | |
90 | delete vPy; | |
91 | ||
7c679be0 | 92 | } |
93 | ||
94 | //----------------------------------------------------------------------------------- | |
36b5cc43 | 95 | void AliDAJetFinder::InitDetAnn(Double_t &dEtSum,Double_t **xData,TVectorD *vPx,TVectorD *vPy,TMatrixD *mPyx,TMatrixD *mY) |
7c679be0 | 96 | { |
97 | //Initialise the variables used by the algorithm | |
98 | fBeta=0.1; | |
9e4cc50d | 99 | fNclustMax= ((AliDAJetHeader*)fHeader)->GetFixedCl() ? |
36b5cc43 | 100 | ((AliDAJetHeader*)fHeader)->GetNclustMax() : |
9e4cc50d | 101 | TMath::Max((Int_t)TMath::Sqrt(fNin),5); |
e53baffe | 102 | TClonesArray *lvArray = fReader->GetMomentumArray(); |
103 | Int_t nEntr = lvArray->GetEntries(); | |
104 | fNin=0; | |
105 | for (Int_t iEn=0; iEn<nEntr; iEn++) if (fReader->GetCutFlag(iEn)==1) fNin++; | |
36b5cc43 | 106 | Double_t *xEta = new Double_t[fNin]; |
e53baffe | 107 | Double_t *xPhi = new Double_t[fNin]; |
36b5cc43 | 108 | xData[0]=xEta; xData[1]=xPhi; |
109 | vPx->ResizeTo(fNin); | |
e53baffe | 110 | Int_t iIn=0; |
111 | for (Int_t iEn=0; iEn<nEntr; iEn++){ | |
112 | if (fReader->GetCutFlag(iEn)==0) continue; | |
113 | TLorentzVector *lv=(TLorentzVector*)lvArray->At(iEn); | |
36b5cc43 | 114 | xEta[iIn] = lv->Eta(); |
115 | xPhi[iIn] = lv->Phi()<0 ? lv->Phi() + 2*TMath::Pi() : lv->Phi(); | |
116 | (*vPx)(iIn)=lv->Pt(); | |
117 | dEtSum+=(*vPx)(iIn); | |
e53baffe | 118 | iIn++; |
7c679be0 | 119 | } |
19b36dbe | 120 | for (iIn=0; iIn<fNin; iIn++) (*vPx)(iIn)=(*vPx)(iIn)/dEtSum; |
7c679be0 | 121 | |
122 | Int_t njdim=2*fNclustMax+1; | |
36b5cc43 | 123 | mPyx->ResizeTo(fNin,njdim); |
124 | mY->ResizeTo(4,njdim); | |
125 | vPy->ResizeTo(njdim); | |
126 | mY->Zero();mPyx->Zero();vPy->Zero(); | |
127 | (*vPy)(0)=1; | |
128 | TMatrixDColumn(*mPyx,0)=1; | |
7c679be0 | 129 | Double_t ypos=0,xpos=0; |
19b36dbe | 130 | for (iIn=0; iIn<fNin; iIn++){ |
36b5cc43 | 131 | (*mY)(0,0)+=(*vPx)(iIn)*xEta[iIn]; |
132 | ypos+=(*vPx)(iIn)*TMath::Sin(xPhi[iIn]); | |
133 | xpos+=(*vPx)(iIn)*TMath::Cos(xPhi[iIn]); | |
7c679be0 | 134 | } |
36b5cc43 | 135 | (*mY)(1,0)=(atan2(ypos,xpos)>0) ? atan2(ypos,xpos) : atan2(ypos,xpos)+2*TMath::Pi(); |
7c679be0 | 136 | } |
137 | ||
138 | //----------------------------------------------------------------------------------- | |
c0a5117c | 139 | void AliDAJetFinder::DoubleClusters(Int_t nc,Int_t &nk, TVectorD *vPy, TMatrixD *mY) const |
7c679be0 | 140 | { |
141 | for(Int_t iClust=0; iClust<nc; iClust++){ | |
36b5cc43 | 142 | (*vPy)(iClust)=(*vPy)(iClust)/2; |
143 | (*vPy)(nc+iClust)=(*vPy)(iClust); | |
144 | for(Int_t iComp=0; iComp<3; iComp++) (*mY)(iComp,nc+iClust)=(*mY)(iComp,iClust); | |
7c679be0 | 145 | } |
146 | nk=2*nc; | |
147 | } | |
148 | ||
149 | //----------------------------------------------------------------------------------- | |
c0a5117c | 150 | void AliDAJetFinder::Annealing(Int_t nk,Double_t **xData, TVectorD *vPx, TVectorD *vPy, TMatrixD *mPyx, TMatrixD *mY) |
7c679be0 | 151 | { |
152 | // Main part of the algorithm | |
153 | const Double_t pi=TMath::Pi(); | |
154 | TVectorD *py = new TVectorD(nk); | |
155 | TVectorD *p = new TVectorD(nk); | |
156 | TMatrixD *y = new TMatrixD(4,nk); | |
157 | TMatrixD *y1 = new TMatrixD(4,nk); | |
158 | TMatrixD *ry = new TMatrixD(2,nk); | |
36b5cc43 | 159 | Double_t *xEta = xData[0]; |
160 | Double_t *xPhi = xData[1]; | |
7c679be0 | 161 | Double_t Dist(TVectorD,TVectorD); |
162 | ||
36b5cc43 | 163 | Double_t df[2]={fReader->GetReaderHeader()->GetFiducialEtaMax(),pi}; |
7c679be0 | 164 | TVectorD vPart(2); |
165 | Double_t *m = new Double_t[nk]; | |
166 | Double_t chi,chi1; | |
167 | do{ | |
168 | Int_t nloop=0; | |
169 | for (Int_t iClust=0; iClust<nk; iClust++){ | |
36b5cc43 | 170 | for (Int_t i=0; i<3; i++)(*y1)(i,iClust)=(*mY)(i,iClust); |
171 | (*py)(iClust)=(*vPy)(iClust); | |
7c679be0 | 172 | } |
173 | //perturbation of codevectors | |
174 | Double_t seed=1000000*gRandom->Rndm(24); | |
175 | ry->Randomize(-0.5,0.5,seed); | |
176 | for (Int_t i=0; i<2; i++){ | |
177 | for (Int_t iClust=0; iClust<nk/2; iClust++) | |
178 | (*y1)(i,iClust)+=((*ry)(i,iClust)+TMath::Sign(0.5,(*ry)(i,iClust)))*fDelta*df[i]; | |
179 | for (Int_t iClust=nk/2; iClust<nk; iClust++) | |
180 | (*y1)(i,iClust)-=((*ry)(i,iClust-nk/2)+TMath::Sign(0.5,(*ry)(i,iClust-nk/2)))*fDelta*df[i]; | |
181 | } | |
182 | do{ | |
183 | //recalculate conditional probabilities | |
184 | nloop++; | |
185 | for (Int_t iIn=0; iIn<fNin; iIn++){ | |
36b5cc43 | 186 | vPart(0)=xEta[iIn]; vPart(1)=xPhi[iIn]; |
7c679be0 | 187 | for(Int_t iClust=0; iClust<nk; iClust++){ |
36b5cc43 | 188 | (*mPyx)(iIn,iClust)=-log((*py)(iClust))+fBeta*Dist(vPart,TMatrixDColumn(*y1,iClust)); |
189 | m[iClust]=(*mPyx)(iIn,iClust); | |
7c679be0 | 190 | } |
191 | Double_t pyxNorm=0; | |
192 | Double_t minPyx=TMath::MinElement(nk,m); | |
193 | for (Int_t iClust=0; iClust<nk; iClust++){ | |
36b5cc43 | 194 | (*mPyx)(iIn,iClust)-=minPyx; |
195 | (*mPyx)(iIn,iClust)=exp(-(*mPyx)(iIn,iClust)); | |
196 | pyxNorm+=(*mPyx)(iIn,iClust); | |
7c679be0 | 197 | } |
36b5cc43 | 198 | for (Int_t iClust=0; iClust<nk; iClust++) (*mPyx)(iIn,iClust)/=pyxNorm; |
7c679be0 | 199 | } |
200 | p->Zero(); | |
201 | y->Zero(); | |
202 | //recalculate codevectors | |
203 | for (Int_t iClust=0; iClust<nk; iClust++){ | |
204 | Double_t xpos=0,ypos=0,pxy; | |
36b5cc43 | 205 | for (Int_t iIn=0; iIn<fNin; iIn++) (*p)(iClust)+=(*vPx)(iIn)*(*mPyx)(iIn,iClust); |
7c679be0 | 206 | for (Int_t iIn=0; iIn<fNin; iIn++){ |
36b5cc43 | 207 | pxy=(*vPx)(iIn)*(*mPyx)(iIn,iClust)/(*p)(iClust); |
208 | ypos+=pxy*TMath::Sin(xPhi[iIn]); | |
209 | xpos+=pxy*TMath::Cos(xPhi[iIn]); | |
210 | (*y)(0,iClust)+=pxy*xEta[iIn]; | |
7c679be0 | 211 | } |
212 | (*y)(1,iClust)=(atan2(ypos,xpos)>0) ? atan2(ypos,xpos) : atan2(ypos,xpos)+2*pi; | |
213 | } | |
214 | //verify codevectors' stability | |
215 | chi=0; | |
216 | for (Int_t iClust=0; iClust<nk; iClust++){ | |
217 | chi1=TMath::CosH((*y1)(0,iClust)-(*y)(0,iClust))-TMath::Cos((*y1)(1,iClust)-(*y)(1,iClust)); | |
218 | chi1/=(2*TMath::CosH((*y1)(0,iClust))*TMath::CosH((*y)(0,iClust))); | |
219 | chi1*=chi1; | |
220 | if (chi1>chi) chi=chi1; | |
221 | } | |
222 | chi=TMath::Sqrt(chi); | |
223 | for (Int_t iClust=0; iClust<nk; iClust++){ | |
224 | for (Int_t i=0; i<2; i++) (*y1)(i,iClust)=(*y)(i,iClust); | |
225 | (*py)(iClust)=(*p)(iClust); | |
226 | } | |
227 | if (nloop>fNloopMax){ | |
228 | if (chi<fEpsMax || nloop>500) break; | |
229 | } | |
230 | }while (chi>fEps); | |
231 | }while (chi>fEpsMax); | |
232 | for (Int_t iClust=0; iClust<nk; iClust++){ //set codevectors and probability equal to those calculated | |
36b5cc43 | 233 | for (Int_t i=0; i<2; i++) (*mY)(i,iClust)=(*y)(i,iClust); |
234 | (*vPy)(iClust)=(*p)(iClust); | |
7c679be0 | 235 | } |
236 | delete py; | |
237 | delete p; | |
238 | delete y; | |
239 | delete y1; | |
240 | delete ry; | |
c0a5117c | 241 | delete [] m; |
7c679be0 | 242 | } |
243 | ||
244 | //----------------------------------------------------------------------------------- | |
c0a5117c | 245 | void AliDAJetFinder::NumCl(Int_t &nc,Int_t &nk,TVectorD *vPy, TMatrixD *mPyx,TMatrixD *mY) |
7c679be0 | 246 | { |
247 | static Bool_t growcl=true; | |
248 | ||
249 | if (nk==2) growcl=true; | |
250 | if (growcl){ | |
251 | //verify if two codevectors are equal within fAvDist | |
252 | Int_t *nSame = new Int_t[nk]; | |
253 | Int_t **iSame = new Int_t*[nk]; | |
254 | Int_t **cont = new Int_t*[nk]; | |
255 | for (Int_t iClust=0; iClust<nk; iClust++) cont[iClust]=new Int_t[nk],iSame[iClust]=new Int_t[nk]; | |
256 | for (Int_t iClust=0; iClust<nk; iClust++){ | |
257 | iSame[iClust][iClust]=1; | |
258 | for (Int_t iClust1=iClust+1; iClust1<nk; iClust1++){ | |
36b5cc43 | 259 | Double_t eta = (*mY)(0,iClust) ; Double_t phi = (*mY)(1,iClust); |
260 | Double_t eta1 = (*mY)(0,iClust1); Double_t phi1 = (*mY)(1,iClust1); | |
7c679be0 | 261 | Double_t distCl=(TMath::CosH(eta-eta1)-TMath::Cos(phi-phi1))/(2*TMath::CosH(eta)*TMath::CosH(eta1)); |
262 | if (distCl < fAvDist) iSame[iClust][iClust1]=iSame[iClust1][iClust]=1; | |
852db00e | 263 | else iSame[iClust][iClust1]=iSame[iClust1][iClust]=0; |
7c679be0 | 264 | } |
265 | } | |
266 | ReduceClusters(iSame,nk,nc,cont,nSame); | |
267 | if (nc >= fNclustMax) growcl=false; | |
268 | //recalculate the nc distinct codevectors | |
269 | TMatrixD *pyx = new TMatrixD(fNin,2*nc); | |
270 | TVectorD *py = new TVectorD(nk); | |
271 | TMatrixD *y1 = new TMatrixD(3,nk); | |
272 | for (Int_t iClust=0; iClust<nc; iClust++){ | |
273 | for(Int_t j=0; j<nSame[iClust]; j++){ | |
274 | Int_t iClust1 = cont[iClust][j]; | |
36b5cc43 | 275 | for (Int_t iIn=0; iIn<fNin; iIn++) (*pyx)(iIn,iClust)+=(*mPyx)(iIn,iClust1); |
276 | (*py)(iClust)+=(*vPy)(iClust1); | |
277 | for (Int_t i=0; i<2; i++) (*y1)(i,iClust)+=(*mY)(i,iClust1); | |
7c679be0 | 278 | } |
279 | for (Int_t i=0; i<2; i++) (*y1)(i,iClust)/=nSame[iClust]; | |
280 | } | |
852db00e | 281 | for (Int_t iClust=0; iClust<nk; iClust++) delete [] cont[iClust], delete [] iSame[iClust]; |
282 | delete [] iSame; | |
283 | delete [] cont; | |
284 | delete [] nSame; | |
7c679be0 | 285 | if (nc > nk/2){ |
286 | for (Int_t iClust=0; iClust<nc; iClust++){ | |
36b5cc43 | 287 | for (Int_t iIn=0; iIn<fNin; iIn++) (*mPyx)(iIn,iClust)=(*pyx)(iIn,iClust); |
288 | for (Int_t iComp=0; iComp<2; iComp++) (*mY)(iComp,iClust)=(*y1)(iComp,iClust); | |
289 | (*vPy)(iClust)=(*py)(iClust); | |
7c679be0 | 290 | } |
291 | nk=nc; | |
36b5cc43 | 292 | if (growcl) DoubleClusters(nc,nk,vPy,mY); |
7c679be0 | 293 | } |
7c679be0 | 294 | delete pyx; |
295 | delete py; | |
296 | delete y1; | |
297 | } | |
298 | ||
299 | } | |
300 | ||
301 | //----------------------------------------------------------------------------------- | |
c0a5117c | 302 | void AliDAJetFinder::ReduceClusters(Int_t **iSame,Int_t nc,Int_t &ncout,Int_t **cont,Int_t *nSameOut) const |
7c679be0 | 303 | { |
304 | Int_t *nSame = new Int_t[nc]; | |
305 | Int_t *iperm = new Int_t[nc]; | |
306 | Int_t *go = new Int_t[nc]; | |
307 | for (Int_t iCl=0; iCl<nc; iCl++){ | |
308 | nSame[iCl]=0; | |
852db00e | 309 | for (Int_t jCl=0; jCl<nc; jCl++) nSame[iCl]+=iSame[iCl][jCl], cont[iCl][jCl]=0; |
7c679be0 | 310 | iperm[iCl]=iCl; |
311 | go[iCl]=1; | |
312 | } | |
313 | TMath::Sort(nc,nSame,iperm,true); | |
314 | Int_t l=0; | |
315 | for (Int_t iCl=0; iCl<nc; iCl++){ | |
316 | Int_t k=iperm[iCl]; | |
317 | if (go[k] == 1){ | |
318 | Int_t m=0; | |
319 | for (Int_t jCl=0; jCl<nc; jCl++){ | |
320 | if (iSame[k][jCl] == 1){ | |
321 | cont[l][m]=jCl; | |
322 | go[jCl]=0; | |
323 | m++; | |
324 | } | |
325 | } | |
326 | nSameOut[l]=m; | |
327 | l++; | |
328 | } | |
329 | } | |
330 | ncout=l; | |
331 | delete [] nSame; | |
332 | delete [] iperm; | |
333 | delete [] go; | |
334 | } | |
335 | ||
336 | //----------------------------------------------------------------------------------- | |
36b5cc43 | 337 | void AliDAJetFinder::EndDetAnn(Int_t &nk,Double_t **xData,Int_t *xx,Double_t etx, |
338 | TVectorD *vPx,TVectorD *vPy,TMatrixD *mPyx,TMatrixD *mY) | |
7c679be0 | 339 | { |
340 | //now assign each particle to only one cluster | |
341 | Double_t *clusters=new Double_t[nk]; | |
342 | for (Int_t iIn=0; iIn<fNin; iIn++){ | |
36b5cc43 | 343 | for (Int_t iClust=0; iClust<nk; iClust++) clusters[iClust]=(*mPyx)(iIn,iClust); |
7c679be0 | 344 | xx[iIn]=TMath::LocMax(nk,clusters); |
345 | } | |
346 | delete [] clusters; | |
347 | ||
348 | //recalculate codevectors, having all p(y|x)=0 or 1 | |
36b5cc43 | 349 | Double_t *xEta = xData[0]; |
350 | Double_t *xPhi = xData[1]; | |
351 | mY->Zero(); | |
352 | mPyx->Zero(); | |
353 | vPy->Zero(); | |
7c679be0 | 354 | for (Int_t iIn=0; iIn<fNin; iIn++){ |
355 | Int_t iClust=xx[iIn]; | |
36b5cc43 | 356 | (*mPyx)(iIn,iClust)=1; |
357 | (*vPy)(iClust)+=(*vPx)(iIn); | |
358 | (*mY)(0,iClust)+=(*vPx)(iIn)*xEta[iIn]; | |
359 | (*mY)(3,iClust)+=(*vPx)(iIn)*etx; | |
7c679be0 | 360 | } |
361 | Int_t k=0; | |
362 | for (Int_t iClust=0; iClust<nk; iClust++){ | |
36b5cc43 | 363 | if ((*vPy)(iClust)>0){ |
7c679be0 | 364 | Double_t xpos=0,ypos=0,pxy; |
365 | for (Int_t iIn=0; iIn<fNin; iIn++){ | |
36b5cc43 | 366 | pxy=(*vPx)(iIn)*(*mPyx)(iIn,iClust)/(*vPy)(iClust); |
367 | ypos+=pxy*TMath::Sin(xPhi[iIn]); | |
368 | xpos+=pxy*TMath::Cos(xPhi[iIn]); | |
7c679be0 | 369 | if (xx[iIn]==iClust) xx[iIn]=k; |
370 | } | |
36b5cc43 | 371 | (*mY)(0,k)=(*mY)(0,iClust)/(*vPy)(iClust); |
372 | (*mY)(1,k)=(atan2(ypos,xpos)>0) ? atan2(ypos,xpos) : atan2(ypos,xpos)+2*TMath::Pi(); | |
373 | (*mY)(3,k)=(*mY)(3,iClust); | |
7c679be0 | 374 | k++; |
375 | } | |
376 | } | |
377 | nk=k; | |
378 | } | |
379 | ||
380 | //----------------------------------------------------------------------------------- | |
c0a5117c | 381 | void AliDAJetFinder::StoreJets(Int_t nk,Double_t **xData, Int_t *xx, TMatrixD *mY) |
7c679be0 | 382 | { |
383 | //evaluate significant clusters properties | |
384 | const Double_t pi=TMath::Pi(); | |
36b5cc43 | 385 | AliJetReaderHeader *rHeader=fReader->GetReaderHeader(); |
386 | Float_t dFiducialEta=rHeader->GetFiducialEtaMax()-rHeader->GetFiducialEtaMin(); | |
387 | Double_t dMeanDist=TMath::Sqrt(2*dFiducialEta*pi/fNin); | |
388 | Double_t *xEta = xData[0]; | |
389 | Double_t *xPhi = xData[1]; | |
7c679be0 | 390 | Bool_t *isJet = new Bool_t[nk]; |
391 | Double_t *etNoBg= new Double_t[nk]; | |
392 | Double_t *dDeltaEta=new Double_t[nk]; | |
393 | Double_t *dDeltaPhi=new Double_t[nk]; | |
394 | Double_t *surf = new Double_t[nk]; | |
395 | Double_t *etDens= new Double_t[nk]; | |
396 | for (Int_t iClust=0; iClust<nk; iClust++){ //clusters loop | |
397 | isJet[iClust]=false; | |
398 | Double_t dEtaMin=10.,dEtaMax=-10.,dPhiMin=10.,dPhiMax=0.; | |
399 | for (Int_t iIn=0; iIn<fNin; iIn++){ | |
400 | if (xx[iIn]!=iClust) continue; | |
36b5cc43 | 401 | if (xEta[iIn] < dEtaMin) dEtaMin=xEta[iIn]; |
402 | if (xEta[iIn] > dEtaMax) dEtaMax=xEta[iIn]; | |
403 | Double_t dPhi=xPhi[iIn]-(*mY)(1,iClust); | |
7c679be0 | 404 | if (dPhi > pi ) dPhi-=2*pi; |
405 | else if (dPhi < (-1)*pi) dPhi+=2*pi; | |
406 | if (dPhi < dPhiMin) dPhiMin=dPhi; | |
407 | else if (dPhi > dPhiMax) dPhiMax=dPhi; | |
408 | } | |
409 | dDeltaEta[iClust]=dEtaMax-dEtaMin+dMeanDist; | |
410 | dDeltaPhi[iClust]=dPhiMax-dPhiMin+dMeanDist; | |
411 | surf[iClust]=0.25*pi*dDeltaEta[iClust]*dDeltaPhi[iClust]; | |
36b5cc43 | 412 | etDens[iClust]=(*mY)(3,iClust)/surf[iClust]; |
7c679be0 | 413 | } |
414 | ||
9e4cc50d | 415 | if (((AliDAJetHeader*)fHeader)->GetSelJets()){ |
7c679be0 | 416 | for (Int_t iClust=0; iClust<nk; iClust++){ |
417 | if (!isJet[iClust]){ | |
418 | Double_t etDensMed=0.; | |
419 | Double_t etDensSqr=0.; | |
420 | Int_t norm=0; | |
421 | for (Int_t iClust1=0; iClust1<nk; iClust1++){ | |
422 | if(iClust1!=iClust){ | |
423 | etDensMed+=etDens[iClust1]; | |
424 | etDensSqr+=TMath::Power(etDens[iClust1],2); | |
425 | norm++; | |
426 | } | |
427 | } | |
428 | etDensMed/=TMath::Max(norm,1); | |
429 | etDensSqr/=TMath::Max(norm,1); | |
430 | Double_t deltaEtDens=TMath::Sqrt(etDensSqr-TMath::Power(etDensMed,2)); | |
36b5cc43 | 431 | if ((*mY)(3,iClust) > (etDensMed+deltaEtDens)*surf[iClust]) isJet[iClust]=kTRUE; |
432 | etNoBg[iClust]=(*mY)(3,iClust)-etDensMed*surf[iClust]; | |
7c679be0 | 433 | } |
434 | } | |
435 | for (Int_t iClust=0; iClust<nk; iClust++){ | |
436 | if (isJet[iClust]){ | |
437 | Double_t etDensMed=0; | |
36b5cc43 | 438 | Double_t extSurf=2*dFiducialEta*pi; |
7c679be0 | 439 | for (Int_t iClust1=0; iClust1<nk; iClust1++){ |
36b5cc43 | 440 | if (!isJet[iClust1]) etDensMed+=(*mY)(3,iClust1); |
7c679be0 | 441 | else extSurf-=surf[iClust1]; |
442 | } | |
443 | etDensMed/=extSurf; | |
36b5cc43 | 444 | etNoBg[iClust]=(*mY)(3,iClust)-etDensMed*surf[iClust]; |
10bd125d | 445 | if (etNoBg[iClust]<((AliDAJetHeader*)fHeader)->GetEtMin()){ |
446 | isJet[iClust]=kFALSE; | |
447 | iClust=-1; | |
448 | } | |
7c679be0 | 449 | } |
450 | } | |
451 | } else { | |
452 | for (Int_t iClust=0; iClust<nk; iClust++) isJet[iClust]=true; | |
453 | } | |
454 | delete [] etDens; | |
455 | delete [] surf; | |
456 | ||
457 | //now add selected jets to the list | |
458 | Int_t *inJet = new Int_t[fNin]; | |
459 | TRefArray *refs = 0; | |
460 | Bool_t fromAod = !strcmp(fReader->ClassName(),"AliJetAODReader"); | |
461 | if (fromAod) refs = fReader->GetReferences(); | |
462 | for (Int_t iClust=0; iClust<nk; iClust++){ //clusters loop | |
463 | if (isJet[iClust]){ //choose cluster | |
464 | Float_t px,py,pz,en; | |
36b5cc43 | 465 | px = (*mY)(3,iClust)*TMath::Cos((*mY)(1,iClust)); |
466 | py = (*mY)(3,iClust)*TMath::Sin((*mY)(1,iClust)); | |
467 | pz = (*mY)(3,iClust)/TMath::Tan(2.0 * TMath::ATan(TMath::Exp(-(*mY)(0,iClust)))); | |
7c679be0 | 468 | en = TMath::Sqrt(px * px + py * py + pz * pz); |
469 | AliAODJet jet(px, py, pz, en); | |
e53baffe | 470 | if (fromAod){ |
471 | Int_t iIn=0; | |
472 | Int_t nEntr = fReader->GetMomentumArray()->GetEntries(); | |
473 | for (Int_t iEn=0; iEn<nEntr; iEn++){ | |
474 | if (fReader->GetCutFlag(iEn)==0) continue; | |
475 | if (xx[iIn]==iClust) jet.AddTrack(refs->At(iEn)); | |
476 | iIn++; | |
477 | } | |
478 | } | |
7c679be0 | 479 | AddJet(jet); |
480 | printf("jet %d, Eta: %f, Phi: %f, Et: %f\n",iClust,jet.Eta(),jet.Phi(),jet.Pt()); | |
481 | } | |
482 | } | |
483 | delete [] dDeltaEta; delete [] dDeltaPhi; | |
484 | delete [] etNoBg; | |
485 | delete [] isJet; | |
486 | delete [] inJet; | |
487 | } | |
488 | ||
489 | //----------------------------------------------------------------------------------- | |
490 | Double_t Dist(TVectorD x,TVectorD y) | |
491 | { | |
492 | // Squared distance | |
493 | const Double_t pi=TMath::Pi(); | |
494 | Double_t dphi=TMath::Abs(x(1)-y(1)); | |
495 | if (dphi > pi) dphi=2*pi-dphi; | |
496 | Double_t dist=pow(x(0)-y(0),2)+pow(dphi,2); | |
497 | return dist; | |
498 | } |