Minor bug fix
[u/mrichter/AliRoot.git] / HMPID / AliHMPIDRecon.cxx
CommitLineData
d3da6dc4 1/**************************************************************************
2 * Copyright(c) 1998-1999, 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// //
18// AliHMPIDRecon //
19// //
20// HMPID class to perfom pattern recognition based on Hough transfrom //
21// for single chamber //
22//////////////////////////////////////////////////////////////////////////
23
a591e55f 24#include "AliHMPIDRecon.h" //class header
d3da6dc4 25#include "AliHMPIDCluster.h" //CkovAngle()
a591e55f 26#include <TRotation.h> //TracePhot()
27#include <TH1D.h> //HoughResponse()
28#include <TClonesArray.h> //CkovAngle()
29#include <AliESDtrack.h> //CkovAngle()
5637918c 30#include <AliESDfriendTrack.h> //CkovAngle()
d3da6dc4 31
d3da6dc4 32//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
c61a7285 33AliHMPIDRecon::AliHMPIDRecon():
34 TTask("RichRec","RichPat"),
35 fPhotCnt(-1),
cdf0e3d9 36 fPhotFlag(0x0),
5637918c 37 fPhotClusIndex(0x0),
cdf0e3d9 38 fPhotCkov(0x0),
39 fPhotPhi(0x0),
40 fPhotWei(0x0),
c61a7285 41 fCkovSigma2(0),
42 fIsWEIGHT(kFALSE),
43 fDTheta(0.001),
44 fWindowWidth(0.045),
45 fRingArea(0),
46 fRingAcc(0),
47 fTrkDir(0,0,1), // Just for test
48 fTrkPos(30,40), // Just for test
cdf0e3d9 49 fMipPos(0,0),
50 fPc(0,0),
c61a7285 51 fParam(AliHMPIDParam::Instance())
d3da6dc4 52{
ffb1ac19 53//..
54//init of data members
55//..
56
ffb1ac19 57 fParam->SetRefIdx(fParam->MeanIdxRad()); // initialization of ref index to a default one
58}
59//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
60void AliHMPIDRecon::InitVars(Int_t n)
61{
62//..
63//Init some variables
64//..
c9e0bd24 65 if(n<=0) return;
ffb1ac19 66 fPhotFlag = new Int_t[n];
5637918c 67 fPhotClusIndex = new Int_t[n];
ffb1ac19 68 fPhotCkov = new Double_t[n];
69 fPhotPhi = new Double_t[n];
70 fPhotWei = new Double_t[n];
71//
72}
73//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
606697a8 74void AliHMPIDRecon::DeleteVars()const
ffb1ac19 75{
76//..
77//Delete variables
78//..
c9e0bd24 79 delete [] fPhotFlag;
5637918c 80 delete [] fPhotClusIndex;
c9e0bd24 81 delete [] fPhotCkov;
82 delete [] fPhotPhi;
83 delete [] fPhotWei;
d3da6dc4 84}
85//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
97a4d538 86void AliHMPIDRecon::CkovAngle(AliESDtrack *pTrk,TClonesArray *pCluLst,Int_t index,Double_t nmean,Float_t xRa,Float_t yRa)
d3da6dc4 87{
88// Pattern recognition method based on Hough transform
59280a5a 89// Arguments: pTrk - track for which Ckov angle is to be found
90// pCluLst - list of clusters for this chamber
91// Returns: - track ckov angle, [rad],
a591e55f 92
5637918c 93
94 AliESDfriendTrack *pFriendTrk = (AliESDfriendTrack*)pTrk->GetFriendTrack();
95
39cd22e6 96 const Int_t nMinPhotAcc = 3; // Minimum number of photons required to perform the pattern recognition
97
ffb1ac19 98 Int_t nClusTot = pCluLst->GetEntries();
99 if(nClusTot>fParam->MultCut()) fIsWEIGHT = kTRUE; // offset to take into account bkg in reconstruction
100 else fIsWEIGHT = kFALSE;
d3da6dc4 101
ffb1ac19 102 InitVars(nClusTot);
103
97a4d538 104 Float_t xPc,yPc,th,ph;
105 pTrk->GetHMPIDtrk(xPc,yPc,th,ph); //initialize this track: th and ph angles at middle of RAD
a591e55f 106 SetTrack(xRa,yRa,th,ph);
611e810d 107
ffb1ac19 108 fParam->SetRefIdx(nmean);
d3da6dc4 109
496c71b0 110 Float_t mipX=-1,mipY=-1;
111 Int_t chId=-1,mipQ=-1,sizeClu = -1;
112
43d3333b 113 fPhotCnt=0;
496c71b0 114
d3da6dc4 115 for (Int_t iClu=0; iClu<pCluLst->GetEntriesFast();iClu++){//clusters loop
af291e40 116 AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluLst->UncheckedAt(iClu); //get pointer to current cluster
117 if(iClu == index) { // this is the MIP! not a photon candidate: just store mip info
496c71b0 118 mipX = pClu->X();
119 mipY = pClu->Y();
120 mipQ=(Int_t)pClu->Q();
121 sizeClu=pClu->Size();
122 continue;
123 }
59280a5a 124 chId=pClu->Ch();
496c71b0 125 Double_t thetaCer,phiCer;
af291e40 126 if(FindPhotCkov(pClu->X(),pClu->Y(),thetaCer,phiCer)){ //find ckov angle for this photon candidate
127 fPhotCkov[fPhotCnt]=thetaCer; //actual theta Cerenkov (in TRS)
5637918c 128 fPhotPhi [fPhotCnt]=phiCer;
129 fPhotClusIndex[fPhotCnt]=iClu; //actual phi Cerenkov (in TRS): -pi to come back to "unusual" ref system (X,Y,-Z)
af291e40 130 fPhotCnt++; //increment counter of photon candidates
59280a5a 131 }
d3da6dc4 132 }//clusters loop
43d3333b 133
af291e40 134 pTrk->SetHMPIDmip(mipX,mipY,mipQ,fPhotCnt); //store mip info in any case
135 pTrk->SetHMPIDcluIdx(chId,index+1000*sizeClu); //set index of cluster
e26c20fa 136
5637918c 137 if(fPhotCnt<=nMinPhotAcc) { //no reconstruction with <=3 photon candidates
39cd22e6 138 pTrk->SetHMPIDsignal(kNoPhotAccept); //set the appropriate flag
39cd22e6 139 return;
140 }
5637918c 141
f1970e74 142 fMipPos.Set(mipX,mipY);
5637918c 143
144 TClonesArray *pPhotCluLst = pFriendTrk->GetHmpPhotClus();
39cd22e6 145
146//PATTERN RECOGNITION STARTED:
147
5637918c 148 Int_t iNrec=FlagPhot(HoughResponse(),pCluLst,pPhotCluLst); //flag photons according to individual theta ckov with respect to most probable
149
2d1a9b21 150 pTrk->SetHMPIDmip(mipX,mipY,mipQ,iNrec); //store mip info
59280a5a 151
5637918c 152 if(iNrec<1){
2d1a9b21 153 pTrk->SetHMPIDsignal(kNoPhotAccept); //no photon candidates are accepted
f1970e74 154 return;
76fd1a96 155 }
5637918c 156
f1970e74 157 Double_t thetaC = FindRingCkov(pCluLst->GetEntries()); //find the best reconstructed theta Cherenkov
2d1a9b21 158// FindRingGeom(thetaC,2);
f1970e74 159 pTrk->SetHMPIDsignal(thetaC); //store theta Cherenkov
160 pTrk->SetHMPIDchi2(fCkovSigma2); //store errors squared
5637918c 161
ffb1ac19 162 DeleteVars();
43400d2d 163}//CkovAngle()
d3da6dc4 164//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
a591e55f 165Bool_t AliHMPIDRecon::FindPhotCkov(Double_t cluX,Double_t cluY,Double_t &thetaCer,Double_t &phiCer)
d3da6dc4 166{
167// Finds Cerenkov angle for this photon candidate
168// Arguments: cluX,cluY - position of cadidate's cluster
a591e55f 169// Returns: Cerenkov angle
d3da6dc4 170
a591e55f 171 TVector3 dirCkov;
172
ffb1ac19 173 Double_t zRad= -0.5*fParam->RadThick()-0.5*fParam->WinThick(); //z position of middle of RAD
67a1c24c 174 TVector3 rad(fTrkPos.X(),fTrkPos.Y(),zRad); //impact point at middle of RAD
ffb1ac19 175 TVector3 pc(cluX,cluY,0.5*fParam->WinThick()+fParam->GapIdx()); //mip at PC
a591e55f 176 Double_t cluR = TMath::Sqrt((cluX-fTrkPos.X())*(cluX-fTrkPos.X())+
177 (cluY-fTrkPos.Y())*(cluY-fTrkPos.Y()));//ref. distance impact RAD-CLUSTER
67a1c24c 178 Double_t phi=(pc-rad).Phi(); //phi of photon
a591e55f 179
b4ad85e9 180 Double_t ckov1=0;
67a1c24c 181 Double_t ckov2=0.75+fTrkDir.Theta(); //start to find theta cerenkov in DRS
b4ad85e9 182 const Double_t kTol=0.01;
d3da6dc4 183 Int_t iIterCnt = 0;
184 while(1){
a591e55f 185 if(iIterCnt>=50) return kFALSE;
d3da6dc4 186 Double_t ckov=0.5*(ckov1+ckov2);
67a1c24c 187 dirCkov.SetMagThetaPhi(1,ckov,phi);
a591e55f 188 TVector2 posC=TraceForward(dirCkov); //trace photon with actual angles
189 Double_t dist=cluR-(posC-fTrkPos).Mod(); //get distance between trial point and cluster position
190 if(posC.X()==-999) dist = - 999; //total reflection problem
191 iIterCnt++; //counter step
b4ad85e9 192 if (dist> kTol) ckov1=ckov; //cluster @ larger ckov
d3da6dc4 193 else if(dist<-kTol) ckov2=ckov; //cluster @ smaller ckov
a591e55f 194 else{ //precision achived: ckov in DRS found
195 dirCkov.SetMagThetaPhi(1,ckov,phi); //
2d1a9b21 196 Lors2Trs(dirCkov,thetaCer,phiCer); //find ckov (in TRS:the effective Cherenkov angle!)
a591e55f 197 return kTRUE;
198 }
d3da6dc4 199 }
200}//FindPhotTheta()
201//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
a591e55f 202TVector2 AliHMPIDRecon::TraceForward(TVector3 dirCkov)const
d3da6dc4 203{
a591e55f 204 //Trace forward a photon from (x,y) up to PC
205 // Arguments: dirCkov photon vector in LORS
206 // Returns: pos of traced photon at PC
ffb1ac19 207
a591e55f 208 TVector2 pos(-999,-999);
67a1c24c 209 Double_t thetaCer = dirCkov.Theta();
ffb1ac19 210 if(thetaCer > TMath::ASin(1./fParam->GetRefIdx())) return pos; //total refraction on WIN-GAP boundary
211 Double_t zRad= -0.5*fParam->RadThick()-0.5*fParam->WinThick(); //z position of middle of RAD
212 TVector3 posCkov(fTrkPos.X(),fTrkPos.Y(),zRad); //RAD: photon position is track position @ middle of RAD
213 Propagate(dirCkov,posCkov, -0.5*fParam->WinThick()); //go to RAD-WIN boundary
214 Refract (dirCkov, fParam->GetRefIdx(),fParam->WinIdx()); //RAD-WIN refraction
215 Propagate(dirCkov,posCkov, 0.5*fParam->WinThick()); //go to WIN-GAP boundary
216 Refract (dirCkov, fParam->WinIdx(),fParam->GapIdx()); //WIN-GAP refraction
217 Propagate(dirCkov,posCkov,0.5*fParam->WinThick()+fParam->GapThick()); //go to PC
a591e55f 218 pos.Set(posCkov.X(),posCkov.Y());
219 return pos;
220}//TraceForward()
221//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2d1a9b21 222void AliHMPIDRecon::Lors2Trs(TVector3 dirCkov,Double_t &thetaCer,Double_t &phiCer)const
a591e55f 223{
224 //Theta Cerenkov reconstruction
2d1a9b21 225 // Arguments: dirCkov photon vector in LORS
226 // Returns: thetaCer of photon in TRS
227 // phiCer of photon in TRS
a591e55f 228// TVector3 dirTrk;
229// dirTrk.SetMagThetaPhi(1,fTrkDir.Theta(),fTrkDir.Phi());
230// Double_t thetaCer = TMath::ACos(dirCkov*dirTrk);
2d1a9b21 231 TRotation mtheta; mtheta.RotateY(-fTrkDir.Theta());
232 TRotation mphi; mphi.RotateZ(-fTrkDir.Phi());
a591e55f 233 TRotation mrot=mtheta*mphi;
234 TVector3 dirCkovTRS;
235 dirCkovTRS=mrot*dirCkov;
236 phiCer = dirCkovTRS.Phi(); //actual value of the phi of the photon
237 thetaCer= dirCkovTRS.Theta(); //actual value of thetaCerenkov of the photon
d3da6dc4 238}
239//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2d1a9b21 240void AliHMPIDRecon::Trs2Lors(TVector3 dirCkov,Double_t &thetaCer,Double_t &phiCer)const
241{
242 //Theta Cerenkov reconstruction
243 // Arguments: dirCkov photon vector in TRS
244 // Returns: thetaCer of photon in LORS
245 // phiCer of photon in LORS
246 TRotation mtheta; mtheta.RotateY(fTrkDir.Theta());
247 TRotation mphi; mphi.RotateZ(fTrkDir.Phi());
248 TRotation mrot=mphi*mtheta;
249 TVector3 dirCkovLORS;
250 dirCkovLORS=mrot*dirCkov;
251 phiCer = dirCkovLORS.Phi(); //actual value of the phi of the photon
252 thetaCer= dirCkovLORS.Theta(); //actual value of thetaCerenkov of the photon
253}
254//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
255void AliHMPIDRecon::FindRingGeom(Double_t ckovAng,Int_t level)
d3da6dc4 256{
4598109f 257// Find area covered in the PC acceptance
2d1a9b21 258// Arguments: ckovAng - cerenkov angle
259// level - precision in finding area and portion of ring accepted (multiple of 50)
d3da6dc4 260// Returns: area of the ring in cm^2 for given theta ckov
261
2d1a9b21 262 Int_t kN=50*level;
263 Int_t nPoints = 0;
afe12692 264 Double_t area=0;
2d1a9b21 265
4598109f 266 Bool_t first=kFALSE;
2d1a9b21 267 TVector2 pos1;
268
afe12692 269 for(Int_t i=0;i<kN;i++){
4598109f 270 if(!first) {
2d1a9b21 271 pos1=TracePhot(ckovAng,Double_t(TMath::TwoPi()*(i+1)/kN)); //find a good trace for the first photon
4598109f 272 if(pos1.X()==-999) continue; //no area: open ring
2d1a9b21 273 if(!fParam->IsInside(pos1.X(),pos1.Y(),0)) {
274 pos1 = IntWithEdge(fMipPos,pos1); // find the very first intersection...
275 } else {
276 if(!AliHMPIDParam::IsInDead(pos1.X(),pos1.Y())) nPoints++; //photon is accepted if not in dead zone
277 }
4598109f 278 first=kTRUE;
279 continue;
280 }
281 TVector2 pos2=TracePhot(ckovAng,Double_t(TMath::TwoPi()*(i+1)/kN)); //trace the next photon
282 if(pos2.X()==-999) continue; //no area: open ring
ffb1ac19 283 if(!fParam->IsInside(pos2.X(),pos2.Y(),0)) {
4598109f 284 pos2 = IntWithEdge(fMipPos,pos2);
2d1a9b21 285 } else {
286 if(!AliHMPIDParam::IsInDead(pos2.X(),pos2.Y())) nPoints++; //photon is accepted if not in dead zone
4598109f 287 }
288 area+=TMath::Abs((pos1-fMipPos).X()*(pos2-fMipPos).Y()-(pos1-fMipPos).Y()*(pos2-fMipPos).X()); //add area of the triangle...
289 pos1 = pos2;
d3da6dc4 290 }
2d1a9b21 291//--- find area and length of the ring;
292 fRingAcc = (Double_t)nPoints/(Double_t)kN;
7fc88c5e 293 area*=0.5;
2d1a9b21 294 fRingArea = area;
295}//FindRingGeom()
d3da6dc4 296//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
4598109f 297TVector2 AliHMPIDRecon::IntWithEdge(TVector2 p1,TVector2 p2)const
298{
299// It finds the intersection of the line for 2 points traced as photons
300// and the edge of a given PC
301// Arguments: 2 points obtained tracing the photons
302// Returns: intersection point with detector (PC) edges
303
4598109f 304 Double_t xmin = (p1.X()<p2.X())? p1.X():p2.X();
305 Double_t xmax = (p1.X()<p2.X())? p2.X():p1.X();
306 Double_t ymin = (p1.Y()<p2.Y())? p1.Y():p2.Y();
307 Double_t ymax = (p1.Y()<p2.Y())? p2.Y():p1.Y();
308
309 Double_t m = TMath::Tan((p2-p1).Phi());
310 TVector2 pint;
311 //intersection with low X
312 pint.Set((Double_t)(p1.X() + (0-p1.Y())/m),0.);
ffb1ac19 313 if(pint.X()>=0 && pint.X()<=fParam->SizeAllX() &&
4598109f 314 pint.X()>=xmin && pint.X()<=xmax &&
315 pint.Y()>=ymin && pint.Y()<=ymax) return pint;
316 //intersection with high X
ffb1ac19 317 pint.Set((Double_t)(p1.X() + (fParam->SizeAllY()-p1.Y())/m),(Double_t)(fParam->SizeAllY()));
318 if(pint.X()>=0 && pint.X()<=fParam->SizeAllX() &&
4598109f 319 pint.X()>=xmin && pint.X()<=xmax &&
320 pint.Y()>=ymin && pint.Y()<=ymax) return pint;
321 //intersection with left Y
322 pint.Set(0.,(Double_t)(p1.Y() + m*(0-p1.X())));
ffb1ac19 323 if(pint.Y()>=0 && pint.Y()<=fParam->SizeAllY() &&
4598109f 324 pint.Y()>=ymin && pint.Y()<=ymax &&
325 pint.X()>=xmin && pint.X()<=xmax) return pint;
326 //intersection with righ Y
ffb1ac19 327 pint.Set((Double_t)(fParam->SizeAllX()),(Double_t)(p1.Y() + m*(fParam->SizeAllX()-p1.X())));
328 if(pint.Y()>=0 && pint.Y()<=fParam->SizeAllY() &&
4598109f 329 pint.Y()>=ymin && pint.Y()<=ymax &&
330 pint.X()>=xmin && pint.X()<=xmax) return pint;
331 return p1;
332}//IntWithEdge()
333//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
d3da6dc4 334Double_t AliHMPIDRecon::FindRingCkov(Int_t)
335{
336// Loops on all Ckov candidates and estimates the best Theta Ckov for a ring formed by those candidates. Also estimates an error for that Theat Ckov
337// collecting errors for all single Ckov candidates thetas. (Assuming they are independent)
338// Arguments: iNclus- total number of clusters in chamber for background estimation
339// Return: best estimation of track Theta ckov
340
341 Double_t wei = 0.;
342 Double_t weightThetaCerenkov = 0.;
343
344 Double_t ckovMin=9999.,ckovMax=0.;
345 Double_t sigma2 = 0; //to collect error squared for this ring
346
347 for(Int_t i=0;i<fPhotCnt;i++){//candidates loop
348 if(fPhotFlag[i] == 2){
a591e55f 349 if(fPhotCkov[i]<ckovMin) ckovMin=fPhotCkov[i]; //find max and min Theta ckov from all candidates within probable window
d3da6dc4 350 if(fPhotCkov[i]>ckovMax) ckovMax=fPhotCkov[i];
a591e55f 351 weightThetaCerenkov += fPhotCkov[i]*fPhotWei[i];
352 wei += fPhotWei[i]; //collect weight as sum of all candidate weghts
d3da6dc4 353
3278403b 354 sigma2 += 1./fParam->Sigma2(fTrkDir.Theta(),fTrkDir.Phi(),fPhotCkov[i],fPhotPhi[i]);
d3da6dc4 355 }
356 }//candidates loop
357
358 if(sigma2>0) fCkovSigma2=1./sigma2;
359 else fCkovSigma2=1e10;
360
b4ad85e9 361 if(wei != 0.) weightThetaCerenkov /= wei; else weightThetaCerenkov = 0.;
d3da6dc4 362 return weightThetaCerenkov;
363}//FindCkovRing()
364//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
5637918c 365Int_t AliHMPIDRecon::FlagPhot(Double_t ckov,TClonesArray *pCluLst, TClonesArray *pPhotCluLst)
d3da6dc4 366{
367// Flag photon candidates if their individual ckov angle is inside the window around ckov angle returned by HoughResponse()
368// Arguments: ckov- value of most probable ckov angle for track as returned by HoughResponse()
369// Returns: number of photon candidates happened to be inside the window
370
a591e55f 371// Photon Flag: Flag = 0 initial set;
372// Flag = 1 good candidate (charge compatible with photon);
373// Flag = 2 photon used for the ring;
5637918c 374 Int_t *PhotIndex = new Int_t[fPhotCnt];
d3da6dc4 375
376 Int_t steps = (Int_t)((ckov )/ fDTheta); //how many times we need to have fDTheta to fill the distance between 0 and thetaCkovHough
377
378 Double_t tmin = (Double_t)(steps - 1)*fDTheta;
379 Double_t tmax = (Double_t)(steps)*fDTheta;
380 Double_t tavg = 0.5*(tmin+tmax);
381
382 tmin = tavg - 0.5*fWindowWidth; tmax = tavg + 0.5*fWindowWidth;
383
384 Int_t iInsideCnt = 0; //count photons which Theta ckov inside the window
385 for(Int_t i=0;i<fPhotCnt;i++){//photon candidates loop
afe12692 386 fPhotFlag[i] = 0;
d3da6dc4 387 if(fPhotCkov[i] >= tmin && fPhotCkov[i] <= tmax) {
388 fPhotFlag[i]=2;
5637918c 389 PhotIndex[iInsideCnt]=fPhotClusIndex[i];
d3da6dc4 390 iInsideCnt++;
391 }
392 }
5637918c 393
394 Int_t nPhot = 0;
395
396 for (Int_t iClu=0; iClu<pCluLst->GetEntriesFast();iClu++){//clusters loop
397 AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluLst->UncheckedAt(iClu); //get pointer to current cluster
398 for(Int_t j=0; j<iInsideCnt; j++){
399 if(iClu==PhotIndex[j]) {
400 new ((*pPhotCluLst)[nPhot++]) AliHMPIDCluster(*pClu); //add this raw cluster
401 }
402 }
403 }
404
405 delete [] PhotIndex;
406
d3da6dc4 407 return iInsideCnt;
5637918c 408
d3da6dc4 409}//FlagPhot()
410//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
a591e55f 411TVector2 AliHMPIDRecon::TracePhot(Double_t ckovThe,Double_t ckovPhi)const
d3da6dc4 412{
413// Trace a single Ckov photon from emission point somewhere in radiator up to photocathode taking into account ref indexes of materials it travereses
ffb1ac19 414// Arguments: ckovThe,ckovPhi- photon ckov angles in TRS, [rad]
d3da6dc4 415// Returns: distance between photon point on PC and track projection
2d1a9b21 416
417 Double_t theta,phi;
418 TVector3 dirTRS,dirLORS;
419 dirTRS.SetMagThetaPhi(1,ckovThe,ckovPhi); //photon in TRS
420 Trs2Lors(dirTRS,theta,phi);
421 dirLORS.SetMagThetaPhi(1,theta,phi); //photon in LORS
422 return TraceForward(dirLORS); //now foward tracing
a591e55f 423}//TracePhot()
d3da6dc4 424//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
a591e55f 425void AliHMPIDRecon::Propagate(const TVector3 dir,TVector3 &pos,Double_t z)const
d3da6dc4 426{
427// Finds an intersection point between a line and XY plane shifted along Z.
428// Arguments: dir,pos - vector along the line and any point of the line
429// z - z coordinate of plain
430// Returns: none
431// On exit: pos is the position if this intesection if any
432 static TVector3 nrm(0,0,1);
433 TVector3 pnt(0,0,z);
434
435 TVector3 diff=pnt-pos;
436 Double_t sint=(nrm*diff)/(nrm*dir);
437 pos+=sint*dir;
438}//Propagate()
439//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
440void AliHMPIDRecon::Refract(TVector3 &dir,Double_t n1,Double_t n2)const
441{
442// Refract direction vector according to Snell law
443// Arguments:
444// n1 - ref idx of first substance
445// n2 - ref idx of second substance
446// Returns: none
447// On exit: dir is new direction
67a1c24c 448 Double_t sinref=(n1/n2)*TMath::Sin(dir.Theta());
76fd1a96 449 if(TMath::Abs(sinref)>1.) dir.SetXYZ(-999,-999,-999);
67a1c24c 450 else dir.SetTheta(TMath::ASin(sinref));
d3da6dc4 451}//Refract()
452//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
453Double_t AliHMPIDRecon::HoughResponse()
454{
455//
611e810d 456// fIdxMip = mipId;
457
d3da6dc4 458//
459 Double_t kThetaMax=0.75;
460 Int_t nChannels = (Int_t)(kThetaMax/fDTheta+0.5);
461 TH1D *phots = new TH1D("Rphot" ,"phots" ,nChannels,0,kThetaMax);
462 TH1D *photsw = new TH1D("RphotWeighted" ,"photsw" ,nChannels,0,kThetaMax);
463 TH1D *resultw = new TH1D("resultw","resultw" ,nChannels,0,kThetaMax);
464 Int_t nBin = (Int_t)(kThetaMax/fDTheta);
465 Int_t nCorrBand = (Int_t)(fWindowWidth/(2*fDTheta));
466
467 for (Int_t i=0; i< fPhotCnt; i++){//photon cadidates loop
468 Double_t angle = fPhotCkov[i]; if(angle<0||angle>kThetaMax) continue;
469 phots->Fill(angle);
470 Int_t bin = (Int_t)(0.5+angle/(fDTheta));
471 Double_t weight=1.;
472 if(fIsWEIGHT){
afe12692 473 Double_t lowerlimit = ((Double_t)bin)*fDTheta - 0.5*fDTheta; Double_t upperlimit = ((Double_t)bin)*fDTheta + 0.5*fDTheta;
2d1a9b21 474 FindRingGeom(lowerlimit);
475 Double_t areaLow = GetRingArea();
476 FindRingGeom(upperlimit);
477 Double_t areaHigh = GetRingArea();
478 Double_t diffArea = areaHigh - areaLow;
d3da6dc4 479 if(diffArea>0) weight = 1./diffArea;
480 }
481 photsw->Fill(angle,weight);
482 fPhotWei[i]=weight;
483 }//photon candidates loop
484
485 for (Int_t i=1; i<=nBin;i++){
486 Int_t bin1= i-nCorrBand;
487 Int_t bin2= i+nCorrBand;
488 if(bin1<1) bin1=1;
489 if(bin2>nBin)bin2=nBin;
490 Double_t sumPhots=phots->Integral(bin1,bin2);
491 if(sumPhots<3) continue; // if less then 3 photons don't trust to this ring
492 Double_t sumPhotsw=photsw->Integral(bin1,bin2);
493 resultw->Fill((Double_t)((i+0.5)*fDTheta),sumPhotsw);
494 }
495// evaluate the "BEST" theta ckov as the maximum value of histogramm
496 Double_t *pVec = resultw->GetArray();
497 Int_t locMax = TMath::LocMax(nBin,pVec);
3ebd8038 498 delete phots;delete photsw;delete resultw; // Reset and delete objects
d3da6dc4 499
500 return (Double_t)(locMax*fDTheta+0.5*fDTheta); //final most probable track theta ckov
501}//HoughResponse()
502//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
0b045c31 503 Double_t AliHMPIDRecon::FindRingExt(Double_t ckov,Int_t ch,Double_t xPc,Double_t yPc,Double_t thRa,Double_t phRa)
9a86b134 504{
505// To find the acceptance of the ring even from external inputs.
506//
507//
508 Double_t xRa = xPc - (fParam->RadThick()+fParam->WinThick()+fParam->GapThick())*TMath::Cos(phRa)*TMath::Tan(thRa); //just linear extrapolation back to RAD
509 Double_t yRa = yPc - (fParam->RadThick()+fParam->WinThick()+fParam->GapThick())*TMath::Sin(phRa)*TMath::Tan(thRa);
510
511 Int_t nStep = 500;
512 Int_t nPhi = 0;
0b045c31 513
514 Int_t ipc,ipadx,ipady;
515
9a86b134 516 if(ckov>0){
517 SetTrack(xRa,yRa,thRa,phRa);
518 for(Int_t j=0;j<nStep;j++){
519 TVector2 pos; pos=TracePhot(ckov,j*TMath::TwoPi()/(Double_t)(nStep-1));
520 if(fParam->IsInDead(pos.X(),pos.Y())) continue;
0b045c31 521 fParam->Lors2Pad(pos.X(),pos.Y(),ipc,ipadx,ipady);
040c21bf 522 ipadx+=(ipc%2)*fParam->kPadPcX;
523 ipady+=(ipc/2)*fParam->kPadPcY;
0b045c31 524 if(fParam->IsDeadPad(ipadx,ipady,ch)) continue;
9a86b134 525 nPhi++;
526 }//point loop
527 return ((Double_t)nPhi/(Double_t)nStep);
528 }//if
529 return -1;
530}