Better estimate of production point
[u/mrichter/AliRoot.git] / HMPID / AliHMPIDReconHTA.cxx
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5a3482a0 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// AliHMPIDReconHTA //
19// //
20// HMPID class to perfom pattern recognition based on Hough transfrom //
21// for single chamber //
22//////////////////////////////////////////////////////////////////////////
23
24#include "AliHMPIDReconHTA.h"//class header
25#include "AliHMPIDCluster.h" //CkovHiddenTrk()
26#include "AliHMPIDRecon.h" //FunMinPhot()
27#include <TMinuit.h> //FitFree()
28#include <TClonesArray.h> //CkovHiddenTrk()
29#include <AliESDtrack.h> //CkovHiddenTrk()
30#include <TH2I.h> //InitDatabase()
31#include <TGraph.h> //ShapeModel()
5a3482a0 32#include <TSpline.h> //ShapeModel()
33#include "TStopwatch.h" //
34
aa00f952 35TH2I* AliHMPIDReconHTA::fgDatabase = 0x0;
5a3482a0 36
37//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
c61a7285 38AliHMPIDReconHTA::AliHMPIDReconHTA():
39 TTask("RichRec","RichPat"),
40 fMipX(-999),
41 fMipY(-999),
42 fMipQ(-999),
43 fRadX(-999),
44 fRadY(-999),
45 fIdxMip(0),
46 fNClu(0),
47 fXClu(0),
48 fYClu(0),
49 fClCk(0),
50 fThTrkFit(-999),
51 fPhTrkFit(-999),
52 fCkovFit(-999),
53 fCkovSig2(0),
54 fParam(AliHMPIDParam::Instance())
5a3482a0 55{
56//..
57//hidden algorithm
58//..
5a3482a0 59 fParam->SetRefIdx(fParam->MeanIdxRad()); // initialization of ref index to a default one
aa00f952 60 if(!fgDatabase) InitDatabase();
5a3482a0 61}
62//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
63AliHMPIDReconHTA::~AliHMPIDReconHTA()
64{
65 DeleteVars();
66}
67//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
68void AliHMPIDReconHTA::InitVars(Int_t n)
69{
70//..
71//Init some variables
72//..
73 fXClu = new Double_t[n];
74 fYClu = new Double_t[n];
75 fClCk = new Bool_t[n];
76 for(Int_t i=0;i<n;i++) fClCk[i] = kTRUE;
77//
78}
79//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
aa00f952 80void AliHMPIDReconHTA::DeleteVars()const
5a3482a0 81{
82//..
83//Delete variables
84//..
85 if(fXClu) delete fXClu;
86 if(fYClu) delete fYClu;
87 if(fClCk) delete fClCk;
88}
89//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
90Bool_t AliHMPIDReconHTA::CkovHiddenTrk(AliESDtrack *pTrk,TClonesArray *pCluLst,Double_t nmean, Double_t qthre)
91{
92// Pattern recognition method without any infos from tracking:HTA (Hidden Track Algorithm)...
93// The method finds in the chmuber the cluster with the highest charge
94// compatibile with a MIP, then the strategy is applied
95// Arguments: pTrk - pointer to ESD track
96// pCluLs - list of clusters for a given chamber
97// nmean - mean freon ref. index
98// Returns: - 0=ok,1=not fitted
99
100 AliHMPIDParam *pParam = AliHMPIDParam::Instance();
101 pParam->SetRefIdx(nmean);
102
103 if(!CluPreFilter(pCluLst)) {return kFALSE;}
104
105 Float_t mipX=-1,mipY=-1;Int_t mipId=-1,mipQ=-1;
106 Double_t qRef = 0;
107 Int_t nCh=0;
108 for (Int_t iClu=0;iClu<pCluLst->GetEntriesFast();iClu++){ //clusters loop
109 AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluLst->UncheckedAt(iClu); //get pointer to current cluster
110 nCh = pClu->Ch();
111 fXClu[iClu] = pClu->X();fYClu[iClu] = pClu->Y(); //store x,y for fitting procedure
112 fClCk[iClu] = kTRUE; //all cluster are accepted at this stage to be reconstructed
113 if(pClu->Q()>qthre) fClCk[iClu] = kFALSE; // not a good photon in any case (multiple MIPs)
114 if(pClu->Q()>qRef){ //searching the highest charge to select a MIP
115 qRef = pClu->Q();
116 mipId=iClu; mipX=pClu->X();mipY=pClu->Y();mipQ=(Int_t)pClu->Q();
117 }
118// Printf(" n. %d x %f y %f Q %f",iClu,pClu->X(),pClu->Y(),pClu->Q());
119 }//clusters loop
120
121 fNClu = pCluLst->GetEntriesFast();
122 if(qRef>qthre){ //charge compartible with MIP clusters
123 fIdxMip = mipId;
124 fClCk[mipId] = kFALSE;
125 fMipX = mipX; fMipY=mipY; fMipQ = qRef;
126// Printf(" mipId %d x %f y %f Q %f",fIdxMip,fMipX,fMipY,fMipQ);
127 if(!DoRecHiddenTrk()) {
128 pTrk->SetHMPIDsignal(pParam->kNoPhotAccept);
129 return kFALSE;
130 } //Do track and ring reconstruction,if problems returns 1
131 pTrk->SetHMPIDtrk(fRadX,fRadY,fThTrkFit,fPhTrkFit); //store track intersection info
132 pTrk->SetHMPIDmip(fMipX,fMipY,(Int_t)fMipQ,fNClu); //store mip info
133 pTrk->SetHMPIDcluIdx(nCh,fIdxMip); //set cham number and index of cluster
134 pTrk->SetHMPIDsignal(fCkovFit); //find best Theta ckov for ring i.e. track
135 pTrk->SetHMPIDchi2(fCkovSig2); //errors squared
136// Printf(" n clusters tot %i accepted %i",pCluLst->GetEntriesFast(),fNClu);
137// Printf("CkovHiddenTrk: thetaC %f th %f ph %f",fCkovFit,fThTrkFit,fPhTrkFit);
138 return kTRUE;
139 }
140
141 return kFALSE;
142}//CkovHiddenTrk()
143//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
144Bool_t AliHMPIDReconHTA::DoRecHiddenTrk()
145{
146// Pattern recognition method without any infos from tracking...
147// First a preclustering filter to avoid part of the noise
148// Then only ellipsed-rings are fitted (no possibility,
149// for the moment, to reconstruct very inclined tracks)
150// Finally a fitting with (th,ph) free, starting by very close values
151// previously evaluated.
152// Arguments: none
153// Returns: none
154 Double_t thTrkRec,phiTrkRec,thetaCRec;
155
156 if(!FindShape(thTrkRec,phiTrkRec,thetaCRec)) return kFALSE;
157
158 if(!FitFree(thTrkRec,phiTrkRec)) {return kFALSE;}
159
160 return kTRUE;
161}//DoRecHiddenTrk()
162/*
163//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
164Bool_t AliHMPIDReconHTA::DoRecHiddenTrk(TClonesArray *pCluLst)
165{
166// Pattern recognition method without any infos from tracking...
167// First a preclustering filter to avoid part of the noise
168// Then only ellipsed-rings are fitted (no possibility,
169// for the moment, to reconstruct very inclined tracks)
170// Finally a fitting with (th,ph) free, starting by very close values
171// previously evaluated.
172// Arguments: none
173// Returns: none
174 Double_t thTrkRec,phiTrkRec,thetaCRec;
175
176 if(!FindShape(thTrkRec,phiTrkRec,thetaCRec)) return kFALSE;
177
178// Printf("thTrkRec %f phiTrkRec %f ThetaCRec %f",thTrkRec*TMath::RadToDeg(),phiTrkRec*TMath::RadToDeg(),thetaCRec*TMath::RadToDeg());
179 Int_t nClTmp1 = pCluLst->GetEntriesFast()-1; //minus MIP...
180 Int_t nClTmp2 = 0;
181
182 while(nClTmp1 != nClTmp2){
183 SetNClu(pCluLst->GetEntriesFast());
184 if(!FitFree(thTrkRec,phiTrkRec)) {return kFALSE;}
185 nClTmp2 = NClu();
186 if(nClTmp2!=nClTmp1) {nClTmp1=nClTmp2;nClTmp2=0;}
187 }
188
189 fNClu = nClTmp2;
190 return kTRUE;
191}//DoRecHiddenTrk()
192*/
193//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
194Bool_t AliHMPIDReconHTA::CluPreFilter(TClonesArray *pCluLst)
195{
aa00f952 196// Pre-filter of bkg clusters
197// Arguments: pSluLst - List of the clusters for a given chamber
198// Returns: status - TRUE if filtering leaves enough photons, FALSE if not
5a3482a0 199//
200 Int_t nClusTot = pCluLst->GetEntriesFast();
201 if(nClusTot<4||nClusTot>100) {
202 return kFALSE;
203 } else {
204 InitVars(nClusTot);
205 return kTRUE;
206 }
207}
208//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
209Bool_t AliHMPIDReconHTA::FindShape(Double_t &thTrkRec,Double_t &phiTrkRec,Double_t &thetaCRec)
210{
aa00f952 211// Finds the estimates for phi and theta of the track and the ThetaCerenkov
212// by using a database of the shapes of the rings
213// Arguments: none
214// Returns: thTrkRec - estimate of theta track
215// phiTrkRec - estimate of phi track
216// thetaCRec - estimate of ThetaCerenkov
217// status - TRUE if a good solution is found, FALSE if not
218
5a3482a0 219 Double_t *phiphot = new Double_t[fNClu];
220 Double_t *dist = new Double_t[fNClu];
221 Int_t *indphi = new Int_t[fNClu];
222
223 Bool_t status;
224
225// Sort in phi angle...
226 for(Int_t i=0;i<fNClu;i++) {
227 phiphot[i] = (TMath::ATan2(fMipY-fYClu[i],fMipX-fXClu[i])+TMath::Pi())*TMath::RadToDeg();
228 dist[i]=TMath::Sqrt((fMipX-fXClu[i])*(fMipX-fXClu[i])+(fMipY-fYClu[i])*(fMipY-fYClu[i]));
229 }
230
231 TMath::Sort(fNClu,phiphot,indphi,kFALSE);
232
233// Purify with a truncated mean;
234 Int_t np=0;
235 Double_t dMean = 0;
236 Double_t dMean2 = 0;
237 for(Int_t i=0;i<fNClu;i++) {
238 if(!fClCk[indphi[i]]) continue; // Check if a good photon candidate or not
239 dMean +=dist[indphi[i]];
240 dMean2+=dist[indphi[i]]*dist[indphi[i]];
241 np++;
242 }
243
244 dMean /=(Double_t)np;
245 dMean2 /=(Double_t)np;
246 Double_t rms = TMath::Sqrt(dMean2 - dMean*dMean);
247
248 for(Int_t i=0;i<fNClu;i++) {
249 if(!fClCk[indphi[i]]) continue; // Check if a good photon candidate or not
250 if(TMath::Abs(dMean-dist[indphi[i]]) > 2*rms) {
251 fClCk[indphi[i]] = kFALSE;
252 continue;
253 }
254 }
255
256//
257// purify vectors for good photon candidates
258//
259 Int_t npeff=0;
260 Double_t *phiphotP = new Double_t[fNClu+1];
261 Double_t *distP = new Double_t[fNClu+1];
262 for(Int_t i=0;i<fNClu;i++) {
263 if(!fClCk[indphi[i]]) continue; // Check if a good photon candidate or not
264 phiphotP[npeff] = phiphot[indphi[i]];
265 distP[npeff] = dist[indphi[i]];
266 npeff++;
267 }
268
269 delete [] phiphot;
270 delete [] dist;
271 delete [] indphi;
272
273 if(npeff<3) {
274 delete [] phiphotP;
275 delete [] distP;
276 return kFALSE;
277 }
278
279// for(Int_t i=0;i<npeff;i++) {Printf(" n. %d phiphot %f dist %f",i,phiphotP[i],distP[i]);}
280
281 Double_t xA,xB;
282 if(ShapeModel(npeff,phiphotP,distP,xA,xB,phiTrkRec)) {
283
284// Printf("FindShape: phi start %f",phiTrkRec*TMath::RadToDeg());
285
aa00f952 286 Int_t bin = fgDatabase->FindBin(xA,xB);
287 Int_t compact = (Int_t)fgDatabase->GetBinContent(bin);
5a3482a0 288 thetaCRec = (Double_t)(compact%1000);
289 thTrkRec = (Double_t)(compact/1000);
290
291 thTrkRec *= TMath::DegToRad();
292 thetaCRec *= TMath::DegToRad();
293
294// Printf("FindShape: xA %f xB %f compact %d thTrk %f thC %f",xA,xB,compact,thTrkRec*TMath::RadToDeg(),thetaCRec*TMath::RadToDeg());
295
296 status = kTRUE;
297
298 } else {
299
300 status = kFALSE;
301
302 }
303
304 delete [] phiphotP;
305 delete [] distP;
306
307 return status;
308}
309//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
310Bool_t AliHMPIDReconHTA::ShapeModel(Int_t np,Double_t *phiphot,Double_t *dist,Double_t &xA,Double_t &xB,Double_t &phiStart)
311{
aa00f952 312// Find a Spline curve to define dist. vs. phi angle
313// in order to estimate the phi of the track
314// Arguments: np - # points corresponding to # photon candidates
315// dist - distance of each photon from MIP
316// phiphot - phi of the photon in the DRS
317// Returns: xA - min. distance from MIP
318// xB - dist. from mip perpedicular to the major axis
319// phiStart- estimate of the track phi
320
5a3482a0 321 TGraph *phigr = new TGraph(np,phiphot,dist);
322 TSpline3 *sphi = new TSpline3("sphi",phigr);
323 if(!sphi) {Printf("Spline not created!Bye.");return kFALSE;}
324
325 Int_t locMin = TMath::LocMin(np,dist);
326 Int_t locMax = TMath::LocMax(np,dist);
327
328 Double_t minX = phiphot[locMin];
329// Double_t minY = dist[locMin];
330 Double_t maxX = phiphot[locMax];
331// Double_t maxY = dist[locMax];
332
333 Int_t ip[3] = {-1,0,1};
334 if(locMin==0 ) {ip[0]= 0;ip[1]= 1;ip[2]= 2;}
335 if(locMin==np-1) {ip[0]=-2;ip[1]=-1;ip[2]= 0;}
336
337 Double_t minXf = VertParab(phiphot[locMin+ip[0]],dist[locMin+ip[0]],
338 phiphot[locMin+ip[1]],dist[locMin+ip[1]],
339 phiphot[locMin+ip[2]],dist[locMin+ip[2]]);
340 if(minXf< phiphot[locMin+ip[0]] || minXf > phiphot[locMin+ip[2]]) minXf = minX;
341
342 ip[0]=-1;ip[1]=0;ip[2]=1;
343 if(locMax==0 ) {ip[0]= 0;ip[1]= 1;ip[2]= 2;}
344 if(locMax==np-1) {ip[0]=-2;ip[1]=-1;ip[2]= 0;}
345
346 Double_t maxXf = VertParab(phiphot[locMax+ip[0]],dist[locMax+ip[0]],
347 phiphot[locMax+ip[1]],dist[locMax+ip[1]],
348 phiphot[locMax+ip[2]],dist[locMax+ip[2]]);
349 if(maxXf< phiphot[locMax+ip[0]] || maxXf > phiphot[locMax+ip[2]]) maxXf = maxX;
350
351// Printf(" phi at mindist %f and found %f",minX,minXf);
352// Printf(" phi at maxdist %f and found %f",maxX,maxXf);
353//
354 if(TMath::Abs(maxXf-minXf)>30) {
355 xA = sphi->Eval(minXf);
356 if(xA < 0) xA = dist[sphi->FindX(xA)];
357 xB = sphi->Eval(minXf-90);
358 if(xB < 0) xB = dist[sphi->FindX(xB)];
359 phiStart = minXf-180; //open ring or acceptance effect...so believe to min phi angle!
360 } else {
361 phiStart = 0.5*(maxXf-180+minXf);
362 xA = sphi->Eval(phiStart+180);
363 if(xA < 0) xA = dist[sphi->FindX(xA)];
364 xB = sphi->Eval(phiStart+90);
365 if(xB < 0) xB = dist[sphi->FindX(xB)];
366 }
367 //
368// Printf("ShapeModel: phiStart %f xA %f xB %f",phiStart,xA,xB);
369
370 phiStart*=TMath::DegToRad();
371 return kTRUE;
372}
373//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
aa00f952 374Double_t AliHMPIDReconHTA::VertParab(Double_t x1,Double_t y1,Double_t x2, Double_t y2, Double_t x3, Double_t y3)const
5a3482a0 375{
aa00f952 376// It uses parabola from 3 points to evaluate the x-coord of the parab
377// Arguments: xi,yi - points
378// Returns: x-coord of the vertex
379
5a3482a0 380 Double_t a = ((x1-x3)*(y1-y2)-(x1-x2)*(y1-y3))/((x1*x1-x2*x2)*(x1-x3)-(x1*x1-x3*x3)*(x1-x2));
381 Double_t b = (y1-y2 - a*(x1*x1-x2*x2))/(x1-x2);
382// Double_t c = y1 - a*x1*x1-b*x1;
383 return -0.5*b/a;
384}
385//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
386Bool_t AliHMPIDReconHTA::FitFree(Double_t thTrkRec,Double_t phiTrkRec)
387{
388// Fit performed by minimizing RMS/sqrt(n) of the
389// photons reconstructed. First phi is fixed and theta
390// is fouond, then (th,ph) of the track
391// as free parameters
392// Arguments: PhiRec phi of the track
393// Returns: none
394
5a3482a0 395 TMinuit *pMinuit = new TMinuit(2);
396 pMinuit->mncler();
397 gMinuit->SetObjectFit((TObject*)this); gMinuit->SetFCN(AliHMPIDReconHTA::FunMinPhot); //set fit function
398 Double_t aArg=-1,parStep,parLow,parHigh; Int_t iErrFlg; //tmp vars for TMinuit
399 Double_t d1,d2,d3;
400 TString sName;
401 Double_t th,ph;
402
403 pMinuit->mnexcm("SET PRI",&aArg,1,iErrFlg); //suspend all printout from TMinuit
404 pMinuit->mnexcm("SET NOW",&aArg,0,iErrFlg);
405
406 if(thTrkRec==0) thTrkRec = 3.*TMath::DegToRad(); // not to start from the edge...
407
408 pMinuit->mnparm(0," thTrk ",thTrkRec ,parStep=0.01,parLow=0,parHigh=TMath::PiOver4(),iErrFlg);
409 pMinuit->mnparm(1," phiTrk ",phiTrkRec,parStep=0.01,parLow=0,parHigh=TMath::TwoPi(),iErrFlg);
410
411 pMinuit->FixParameter(1);
412 pMinuit->mnexcm("SIMPLEX" ,&aArg,0,iErrFlg);
413 pMinuit->mnexcm("MIGRAD" ,&aArg,0,iErrFlg);
414 pMinuit->Release(1);
415 pMinuit->mnexcm("MIGRAD" ,&aArg,0,iErrFlg);
416
417 pMinuit->mnpout(0,sName,th,d1,d2,d3,iErrFlg);
418 pMinuit->mnpout(1,sName,ph,d1,d2,d3,iErrFlg);
419
420 Double_t f,par[2];
421 Double_t *grad=0x0;
422 par[0] = th;par[1] = ph;
423 pMinuit->Eval(2,grad,f,par,3);
424
425// Printf("FitFree: theta %f phi %f",th,ph);
426
427 SetTrkFit(th,ph);
428 return kTRUE;
429}
430//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
431void AliHMPIDReconHTA::FunMinPhot(Int_t &/* */,Double_t* /* */,Double_t &f,Double_t *par,Int_t iflag)
432{
433// Minimization function to find best track and thetaC parameters
434// Arguments: f = function value to minimize
435// par = list of parameter to find
436// iflag = flag status. See Minuit instructions
437// Returns: none
438//
439// Note: it is necessary to call an instance of AlihMPIDParam. Not possible to use fParam
440// because of the static instantiation of the function in Minuit
441
442 AliHMPIDParam *pParam=AliHMPIDParam::Instance();
443 AliHMPIDReconHTA *pRecHTA=(AliHMPIDReconHTA*)gMinuit->GetObjectFit();
444 AliHMPIDRecon pRec;
445 Double_t sizeCh = 0.5*pParam->RadThick()+pParam->WinThick()+pParam->GapThick();
446 Double_t thTrk = par[0];
447 Double_t phTrk = par[1];
448 Double_t xrad = pRecHTA->MipX() - sizeCh*TMath::Tan(thTrk)*TMath::Cos(phTrk);
449 Double_t yrad = pRecHTA->MipY() - sizeCh*TMath::Tan(thTrk)*TMath::Sin(phTrk);
450 pRecHTA->SetRadXY(xrad,yrad);
451 pRec.SetTrack(xrad,yrad,thTrk,phTrk);
452
453 Double_t meanCkov =0;
454 Double_t meanCkov2=0;
455 Double_t thetaCer,phiCer;
456 Int_t nClAcc = 0;
457 Int_t nClTot=pRecHTA->NClu();
458
459 for(Int_t i=0;i<nClTot;i++) {
460 if(!(pRecHTA->ClCk(i))) continue;
461 pRec.FindPhotCkov(pRecHTA->XClu(i),pRecHTA->YClu(i),thetaCer,phiCer);
462 meanCkov += thetaCer;
463 meanCkov2 += thetaCer*thetaCer;
464 nClAcc++;
465 }
466 if(nClAcc==0) {f=999;return;}
467 meanCkov /=(Double_t)nClAcc;
468 meanCkov2 /=(Double_t)nClAcc;
469 Double_t rms = TMath::Sqrt(TMath::Abs(meanCkov2 - meanCkov*meanCkov));
470 f = rms/TMath::Sqrt((Double_t)nClAcc);
471
472 if(iflag==3) {
473/*
474 Printf("FunMinPhot before: photons candidates %i used %i",nClTot,nClAcc);
475 nClAcc = 0;
476 Double_t meanCkov1=0;
477 Double_t meanCkov2=0;
478 for(Int_t i=0;i<nClTot;i++) {
479 if(!(pRec->ClCk(i))) continue;
480 pRec->FindPhotCkov(pRec->XClu(i),pRec->YClu(i),thetaCer,phiCer);
481 if(TMath::Abs(thetaCer-meanCkov)<2*rms) {
482 meanCkov1 += thetaCer;
483 meanCkov2 += thetaCer*thetaCer;
484 nClAcc++;
485 } else pRec->SetClCk(i,kFALSE);
486 }
487 meanCkov1/=nClAcc;
488 Double_t rms2 = (meanCkov2 - meanCkov*meanCkov*nClAcc)/nClAcc;
489 Printf("FunMinPhot after: photons candidates %i used %i thetaCer %f",nClTot,nClAcc,meanCkov1);
490 pRec->SetCkovFit(meanCkov1);
491 pRec->SetCkovSig2(rms2);
492 pRec->SetNClu(nClAcc);
493*/
494// Printf("FunMinPhot: reconstructed theta Cerenkov %f with %d photons",meanCkov,nClAcc);
495 pRecHTA->SetCkovFit(meanCkov);
496 pRecHTA->SetCkovSig2(rms*rms);
497 pRecHTA->SetNClu(nClAcc);
498 }
499}//FunMinPhot()
500//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
501void AliHMPIDReconHTA::InitDatabase()
502{
aa00f952 503// Construction a database of ring shapes on fly
504// Arguments: none
505// Returns : none
506// N.B. fgDatabase points to a TH2I with x-min dist from MIP
507// y-dist from the ring of the MIP perpendicular to major axis
508// The content is the packed info of track theta and thetaC in degrees
509// thetaC+1000*thTrk
510//
5a3482a0 511 TStopwatch timer;
512 timer.Start();
513
514 AliInfo(Form("database HTA is being built.Please, wait..."));
515//
c61a7285 516 Double_t x[3]={0,0,0},y[3];
5a3482a0 517
518 AliHMPIDRecon rec;
519
520 if(!fParam) fParam=AliHMPIDParam::Instance();
521 Double_t thetaMax = TMath::ACos(1./fParam->MeanIdxRad());
522 Double_t thTrkMax = 1./TMath::ASin(fParam->MeanIdxRad());
523
524 Int_t nstepx = 1000;
525 Int_t nstepy = 1000;
526
527 TH2I *deconv = new TH2I("deconv","database;d1;d2;thC+1000*thTrk",500,0,50,150,0,15);
528 //
529 Double_t xrad = 0;
530 Double_t yrad = 0;
531 Double_t phTrk = 0;
532
533 for(Int_t i=0;i<nstepx;i++) { //loop on thetaC
534 for(Int_t j=0;j<nstepy;j++) { //loop on theta particle
535 Double_t thetaC = thetaMax/nstepx*((Double_t)i+0.5);
536 Double_t thTrk = thTrkMax/nstepy*((Double_t)j+0.5);
537 //
538 //mip position
539 //
fcaff63d 540 Double_t sizeCh = 0.5*fParam->RadThick()+fParam->WinThick()+fParam->GapThick();
5a3482a0 541 Double_t xmip = xrad + sizeCh*TMath::Tan(thTrk)*TMath::Cos(phTrk);
542 Double_t ymip = yrad + sizeCh*TMath::Tan(thTrk)*TMath::Sin(phTrk);
543
544 Double_t dist1,dist2;
545 //
546 //first point at phi=0
547 //
548 rec.SetTrack(xrad,yrad,thTrk,phTrk);
549 TVector2 pos;
550 pos=rec.TracePhot(thetaC,0);
551
552 if(pos.X()==-999) {
553 dist1 = 0; //open ring...anly the distance btw mip and point at 180 will be considered
554 } else {
555 x[0] = pos.X(); y[0] = pos.Y();
556 dist1 = TMath::Sqrt((x[0]-xmip)*(x[0]-xmip)+(y[0]-ymip)*(y[0]-ymip));
557 }
558 //
559 //second point at phi=180
560 //
561 rec.SetTrack(xrad,yrad,thTrk,phTrk);
562 pos=rec.TracePhot(thetaC,TMath::Pi());
563
564 if(pos.X()==-999) {Printf("it should not happens!Bye");return;}
565 x[1] = pos.X(); y[1] = pos.Y();
566 if((x[1]-xmip)*(x[0]-xmip)>0) continue; // to avoid circles out mips (for very low ThetaC)
567 dist2 = TMath::Sqrt((x[1]-xmip)*(x[1]-xmip)+(y[1]-ymip)*(y[1]-ymip));
568
569// Double_t distA = dist1+dist2;
570 Double_t distA = dist2; // only the minimum: problem of acceptance
571 //
572 //second point at phi=90
573 //
574 rec.SetTrack(xrad,yrad,thTrk,phTrk);
575 pos=rec.TracePhot(thetaC,TMath::PiOver2());
576
577 if(pos.X()==-999) continue;
578 x[2] = pos.X(); y[2] = pos.Y();
579 Double_t distB = TMath::Sqrt((x[2]-xmip)*(x[2]-xmip)+(y[2]-ymip)*(y[2]-ymip));
580// compact the infos...
581 Int_t compact = (Int_t)(thetaC*TMath::RadToDeg())+1000*(Int_t)(thTrk*TMath::RadToDeg());
582 Int_t bin = deconv->FindBin(distA,distB);
583 if(deconv->GetBinContent(bin)==0) deconv->Fill(distA,distB,compact);
584 }
585 }
586
587 FillZeroChan(deconv);
aa00f952 588 fgDatabase = deconv;
5a3482a0 589
590 timer.Stop();
591 Double_t nSecs = timer.CpuTime();
592 AliInfo(Form("database HTA successfully open in %3.1f sec.(CPU). Reconstruction is started.",nSecs));
593}
594//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
aa00f952 595void AliHMPIDReconHTA::FillZeroChan(TH2I *deconv)const
5a3482a0 596{
606697a8 597 //If fills eventually channel without entries
598 //inthe histo "database" jyst interpolating the neighboring cells
599 // Arguments: histogram pointer of the database
600 // Returns: none
601 //
5a3482a0 602 Int_t nbinx = deconv->GetNbinsX();
603 Int_t nbiny = deconv->GetNbinsY();
604 for(Int_t i = 0;i<nbinx;i++) {
605 for(Int_t j = 0;j<nbiny;j++) {
606 if(deconv->GetBinContent(i,j) == 0) {
607 Int_t nXmin = i-1; Int_t nXmax=i+1;
608 Int_t nYmin = j-1; Int_t nYmax=j+1;
609 Int_t nc = 0;
610 Double_t meanC =0;
611 Double_t meanTrk =0;
612 for(Int_t ix=nXmin;ix<=nXmax;ix++) {
613 if(ix<0||ix>nbinx) continue;
614 for(Int_t iy=nYmin;iy<=nYmax;iy++) {
615 if(iy<0||iy>nbiny) continue;
616 meanC += (Int_t)deconv->GetBinContent(ix,iy)%1000;
617 meanTrk+= (Int_t)deconv->GetBinContent(ix,iy)/1000;
618 nc++;
619 }
620 meanC/=nc; meanTrk/=nc;
621 Int_t compact = (Int_t)meanC+1000*(Int_t)meanTrk;
622 if(compact>0)deconv->SetCellContent(i,j,compact);
623 }
624 }
625 }
626 }
627}
628//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++