MUON/AliMUONTrackHitPattern.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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  15
  16 /* $Id$ */
  17
  18
  19 //-----------------------------------------------------------------------------
  20 /// \class AliMUONTrackHitPattern
  21 ///
  22 /// This class propagates tracks to trigger chambers
  23 /// searching for matching trigger tracks and fired strips.
  24 ///
  25 /// To each track, a hit pattern for trigger chambers is set.
  26 ///
  27 /// The main method is:
  28 /// * ExecuteValidation
  29 ///
  30 ///  \author Diego Stocco
  31 //-----------------------------------------------------------------------------
  32
  33
  34 #include "AliMUONTrackHitPattern.h"
  35
  36 #include "AliMUONConstants.h"
  37 #include "AliMUONVDigit.h"
  38 #include "AliMUONDigitMaker.h"
  39 #include "AliMUONDigitStoreV1.h"
  40 #include "AliMUONGeometryTransformer.h"
  41 #include "AliMUONLocalTrigger.h"
  42 #include "AliMUONLocalTriggerBoard.h"
  43 #include "AliMUONRecoParam.h"
  44 #include "AliMUONTrack.h"
  45 #include "AliMUONTrackExtrap.h"
  46 #include "AliMUONTrackParam.h"
  47 #include "AliMUONVTrackStore.h"
  48 #include "AliMUONVTriggerStore.h"
  49 #include "AliMpPad.h"
  50 #include "AliMpSegmentation.h"
  51 #include "AliMpVSegmentation.h"
  52 #include "AliMpDEManager.h"
  53 #include "AliMUONReconstructor.h"
  54 #include "AliMUONTriggerTrack.h"
  55 #include "AliMUONVTriggerTrackStore.h"
  56
  57 #include "AliMpConstants.h"
  58
  59 #include "AliLog.h"
  60 #include "AliTracker.h"
  61 #include "AliESDMuonTrack.h"
  62
  63 #include <Riostream.h>
  64 #include <TArrayS.h>
  65 #include <TClonesArray.h>
  66 #include <TMath.h>
  67 #include <TMatrixD.h>
  68 #include <TROOT.h>
  69 #include <TDirectory.h>
  70 #include <TFile.h>
  71 #include <TSystem.h>
  72 #include <TVector2.h>
  73
  74 #include <cassert>
  75
  76 /// \cond CLASSIMP
  77 ClassImp(AliMUONTrackHitPattern) // Class implementation in ROOT context
  78 /// \endcond
  79
  80
  81 //______________________________________________________________________________
  82 AliMUONTrackHitPattern::AliMUONTrackHitPattern(const AliMUONRecoParam* recoParam,
  83                                                const AliMUONGeometryTransformer& transformer,
  84                                                const AliMUONDigitMaker& digitMaker)
  85 : TObject(),
  86 fkRecoParam(recoParam),
  87 fkTransformer(transformer),
  88 fkDigitMaker(digitMaker),
  89 fDeltaZ(0.0),
  90 fTrigCovariance(0x0),
  91 fkMaxDistance(99999.)
  92 {
  93     /// Default constructor
  94     InitMembers();
  95     AliMUONTrackExtrap::SetField();
  96 }
  97
  98
  99 //______________________________________________________________________________
 100 AliMUONTrackHitPattern::~AliMUONTrackHitPattern(void)
 101 {
 102   /// Destructor
 103   delete fTrigCovariance;
 104 }
 105
 106
 107 //______________________________________________________________________________
 108 void AliMUONTrackHitPattern::InitMembers()
 109 {
 110   //
 111   /// Initialize data members
 112   //
 113   fDeltaZ = AliMUONConstants::DefaultChamberZ(10) - AliMUONConstants::DefaultChamberZ(12);
 114
 115   const Double_t kTrigNonBendReso = AliMUONConstants::TriggerNonBendingReso();
 116   const Double_t kTrigBendReso = AliMUONConstants::TriggerBendingReso();
 117
 118   // Covariance matrix 3x3 (X,Y,slopeY) for trigger tracks
 119   fTrigCovariance = new TMatrixD(3,3);
 120   fTrigCovariance->Zero();
 121   (*fTrigCovariance)(0,0) = kTrigNonBendReso * kTrigNonBendReso;
 122   (*fTrigCovariance)(1,1) = kTrigBendReso * kTrigBendReso;
 123   (*fTrigCovariance)(2,2) = 2. * (*fTrigCovariance)(1,1) / fDeltaZ / fDeltaZ;
 124   (*fTrigCovariance)(1,2) = (*fTrigCovariance)(2,1) = (*fTrigCovariance)(1,1) / fDeltaZ;
 125 }
 126
 127
 128 //_____________________________________________________________________________
 129 void AliMUONTrackHitPattern::CheckConstants() const
 130 {
 131 /// Check consistence of redefined constants
 132
 133   assert(fgkNcathodes == AliMpConstants::NofCathodes());
 134   assert(fgkNchambers == AliMpConstants::NofTriggerChambers());
 135   assert(fgkNplanes == AliMpConstants::NofTriggerChambers() * fgkNcathodes);
 136 }
 137
 138
 139 //______________________________________________________________________________
 140 void AliMUONTrackHitPattern::ExecuteValidation(const AliMUONVTrackStore& trackStore,
 141                                                const AliMUONVTriggerTrackStore& triggerTrackStore,
 142                                                const AliMUONVTriggerStore& triggerStore) const
 143 {
 144   //
 145   /// Main method:
 146   /// Loops on reco tracks, extrapolates them to trigger chambers
 147   /// and searches for matching trigger tracks and digits
 148   //
 149
 150   AliMUONDigitStoreV1 digitStore;
 151   fkDigitMaker.TriggerToDigitsStore(triggerStore,digitStore);
 152
 153   // Get the hit pattern for all trigger tracks
 154   AliMUONTriggerTrack* triggerTrack;
 155   TIter itTriggerTrack(triggerTrackStore.CreateIterator());
 156   while ( ( triggerTrack = static_cast<AliMUONTriggerTrack*>(itTriggerTrack() ) ) ){
 157     UShort_t pattern = GetHitPattern(triggerTrack, digitStore);
 158     triggerTrack->SetHitsPatternInTrigCh(pattern);
 159     AliDebug(1, Form("Hit pattern: hits 0x%x  slat %2i  board %3i  effFlag %i",
 160                      pattern & 0xFF, AliESDMuonTrack::GetSlatOrInfo(pattern),
 161                      triggerTrack->GetLoTrgNum(), AliESDMuonTrack::GetEffFlag(pattern)));
 162   }
 163
 164   // Match tracker tracks with trigger tracks.
 165   TIter itTrack(trackStore.CreateIterator());
 166   AliMUONTrack* track;
 167
 168   const Int_t kFirstTrigCh = AliMUONConstants::NTrackingCh();
 169
 170   while ( ( track = static_cast<AliMUONTrack*>(itTrack()) ) )
 171   {
 172     AliMUONTrackParam trackParam(*((AliMUONTrackParam*) (track->GetTrackParamAtCluster()->Last())));
 173
 174     ApplyMCSCorrections(trackParam);
 175     AliMUONTrackExtrap::ExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(kFirstTrigCh)); // extrap to 1st trigger chamber
 176
 177     AliMUONTriggerTrack *matchedTriggerTrack = MatchTriggerTrack(track, trackParam, triggerTrackStore, triggerStore);
 178
 179     // Copy trigger tracks hit pattern if there is matching,
 180     // otherwise calculate the hit pattern directly from tracker track:
 181     // the obtained pattern is good for check, but not good for efficiency determination.
 182     UShort_t pattern = matchedTriggerTrack ?
 183       matchedTriggerTrack->GetHitsPatternInTrigCh() :
 184       GetHitPattern(&trackParam, digitStore);
 185
 186     track->SetHitsPatternInTrigCh(pattern);
 187   }
 188 }
 189
 190
 191 //______________________________________________________________________________
 192 AliMUONTriggerTrack *
 193 AliMUONTrackHitPattern::MatchTriggerTrack(AliMUONTrack* track,
 194                                           AliMUONTrackParam& trackParam,
 195                                           const AliMUONVTriggerTrackStore& triggerTrackStore,
 196                                           const AliMUONVTriggerStore& triggerStore) const
 197 {
 198   //
 199   /// Match track with trigger track
 200   //
 201
 202   Int_t matchTrigger = 0;
 203   Int_t loTrgNum(-1);
 204   Double_t distTriggerTrack[3], sigma2[3];
 205   Double_t chi2;
 206   Double_t chi2MatchTrigger = 0., minChi2MatchTrigger = 999.;
 207   Int_t doubleMatch = -1; // Check if track matches 2 trigger tracks
 208   Double_t doubleChi2 = -1.;
 209   AliMUONTriggerTrack* doubleTriggerTrack = 0x0;
 210   AliMUONTriggerTrack* matchedTriggerTrack = 0x0;
 211
 212   const TMatrixD& kParamCov = trackParam.GetCovariances();
 213
 214   Double_t xTrack = trackParam.GetNonBendingCoor();
 215   Double_t yTrack = trackParam.GetBendingCoor();
 216   Double_t ySlopeTrack = trackParam.GetBendingSlope();
 217
 218   // Covariance matrix 3x3 (X,Y,slopeY) for tracker tracks
 219   TMatrixD trackCov(3,3);
 220   trackCov.Zero();
 221   trackCov(0,0) = kParamCov(0,0);
 222   trackCov(1,1) = kParamCov(2,2);
 223   trackCov(2,2) = kParamCov(3,3);
 224   trackCov(1,2) = kParamCov(2,3);
 225   trackCov(2,1) = kParamCov(3,2);
 226
 227   TMatrixD sumCov(trackCov,TMatrixD::kPlus,*fTrigCovariance);
 228
 229   Bool_t isCovOK = kTRUE;
 230
 231   if (sumCov.Determinant() != 0) {
 232     sumCov.Invert();
 233   } else {
 234     AliWarning(" Determinant = 0");
 235     isCovOK = kFALSE;
 236     sigma2[0] = kParamCov(0,0);
 237     sigma2[1] = kParamCov(2,2);
 238     sigma2[2] = kParamCov(3,3);
 239     // sigma of distributions (trigger-track) X,Y,slopeY
 240     const Double_t kDistSigma[3]={AliMUONConstants::TriggerNonBendingReso(),
 241                                   AliMUONConstants::TriggerBendingReso(),
 242                                   1.414 * AliMUONConstants::TriggerBendingReso()/fDeltaZ};
 243     for (Int_t iVar = 0; iVar < 3; iVar++) sigma2[iVar] += kDistSigma[iVar] * kDistSigma[iVar];
 244   }
 245
 246   AliMUONTriggerTrack *triggerTrack;
 247   TIter itTriggerTrack(triggerTrackStore.CreateIterator());
 248   while ( ( triggerTrack = static_cast<AliMUONTriggerTrack*>(itTriggerTrack() ) ) )
 249   {
 250     distTriggerTrack[0] = triggerTrack->GetX11() - xTrack;
 251     distTriggerTrack[1] = triggerTrack->GetY11() - yTrack;
 252     distTriggerTrack[2] = TMath::Tan(triggerTrack->GetThetay()) - ySlopeTrack;
 253
 254     if(isCovOK){
 255       TMatrixD paramDiff(3,1);
 256       for(Int_t iVar = 0; iVar < 3; iVar++)
 257         paramDiff(iVar,0) = distTriggerTrack[iVar];
 258
 259       TMatrixD tmp(sumCov,TMatrixD::kMult,paramDiff);
 260       TMatrixD chi2M(paramDiff,TMatrixD::kTransposeMult,tmp);
 261       chi2 = chi2M(0,0);
 262     }
 263     else {
 264       chi2 = 0.;
 265       for (Int_t iVar = 0; iVar < 3; iVar++) chi2 += distTriggerTrack[iVar]*distTriggerTrack[iVar]/sigma2[iVar];
 266     }
 267
 268     chi2 /= 3.; // Normalized Chi2: 3 degrees of freedom (X,Y,slopeY)
 269     if (chi2 < GetRecoParam()->GetMaxNormChi2MatchTrigger())
 270     {
 271       Bool_t isDoubleTrack = (TMath::Abs(chi2 - minChi2MatchTrigger)<1.);
 272       if (chi2 < minChi2MatchTrigger && chi2 < GetRecoParam()->GetMaxNormChi2MatchTrigger())
 273       {
 274         if(isDoubleTrack)
 275         {
 276           doubleMatch = loTrgNum;
 277           doubleChi2 = chi2MatchTrigger;
 278           doubleTriggerTrack = matchedTriggerTrack;
 279         }
 280         minChi2MatchTrigger = chi2;
 281         chi2MatchTrigger = chi2;
 282         loTrgNum = triggerTrack->GetLoTrgNum();
 283         matchedTriggerTrack = triggerTrack;
 284         AliMUONLocalTrigger* locTrg = triggerStore.FindLocal(loTrgNum);
 285         matchTrigger = 1;
 286         if(locTrg->LoLpt()>0) matchTrigger = 2;
 287         if(locTrg->LoHpt()>0) matchTrigger = 3;
 288       }
 289       else if(isDoubleTrack)
 290       {
 291         doubleMatch = triggerTrack->GetLoTrgNum();
 292         doubleChi2 = chi2;
 293       }
 294     }
 295   }
 296   if(doubleMatch>=0)
 297   { // If two trigger tracks match, select the one passing more trigger cuts
 298     AliDebug(1, Form("Two candidates found: %i and %i",loTrgNum,doubleMatch));
 299     AliMUONLocalTrigger* locTrg1 = triggerStore.FindLocal(doubleMatch);
 300     if((locTrg1->LoLpt()>0 && matchTrigger<2) || (locTrg1->LoHpt() && matchTrigger<3))
 301     {
 302       if(locTrg1->LoHpt()>0) matchTrigger=3;
 303       else matchTrigger = 2;
 304       loTrgNum = doubleMatch;
 305       chi2MatchTrigger = doubleChi2;
 306       matchedTriggerTrack = doubleTriggerTrack;
 307     }
 308   }
 309
 310   track->SetMatchTrigger(matchTrigger);
 311   track->SetLoTrgNum(loTrgNum);
 312   track->SetChi2MatchTrigger(chi2MatchTrigger);
 313
 314   AliMUONLocalTrigger* locTrg = static_cast<AliMUONLocalTrigger*>(triggerStore.FindLocal(loTrgNum));
 315
 316   if (locTrg)
 317   {
 318     track->SetLocalTrigger(locTrg->LoCircuit(),
 319                            locTrg->LoStripX(),
 320                            locTrg->LoStripY(),
 321                            locTrg->GetDeviation(),
 322                            locTrg->LoLpt(),
 323                            locTrg->LoHpt(),
 324                            locTrg->GetTriggerWithoutChamber());
 325   }
 326
 327   return matchedTriggerTrack;
 328 }
 329
 330
 331 //______________________________________________________________________________
 332 UShort_t AliMUONTrackHitPattern::GetHitPattern(AliMUONTriggerTrack* matchedTriggerTrack,
 333                                                AliMUONVDigitStore& digitStore) const
 334 {
 335   //
 336   /// Get hit pattern on trigger chambers for the current trigger track
 337   //
 338   UShort_t pattern = 0;
 339   PerformTrigTrackMatch(pattern, matchedTriggerTrack, digitStore);
 340   return pattern;
 341 }
 342
 343
 344 //______________________________________________________________________________
 345 UShort_t AliMUONTrackHitPattern::GetHitPattern(AliMUONTrackParam* trackParam,
 346                                                AliMUONVDigitStore& digitStore) const
 347 {
 348   //
 349   /// Get hit pattern on trigger chambers for the current tracker track
 350   //
 351   UShort_t pattern = 0;
 352   Bool_t isMatch[2];
 353   const Int_t kNTrackingCh = AliMUONConstants::NTrackingCh();
 354
 355   for(Int_t ch=0; ch<4; ++ch)
 356   {
 357     Int_t iChamber = kNTrackingCh+ch;
 358     AliMUONTrackExtrap::ExtrapToZCov(trackParam, AliMUONConstants::DefaultChamberZ(iChamber));
 359     FindPadMatchingTrack(digitStore, *trackParam, isMatch, iChamber);
 360     for(Int_t cath=0; cath<2; ++cath)
 361     {
 362       if(isMatch[cath]) AliESDMuonTrack::SetFiredChamber(pattern, cath, ch);
 363     }
 364   }
 365
 366   // pattern obtained by propagation of tracker track
 367   // when it does not match the trigger.
 368   AliESDMuonTrack::AddEffInfo(pattern, AliESDMuonTrack::kTrackerTrackPattern);
 369
 370   return pattern;
 371 }
 372
 373 //______________________________________________________________________________
 374 void
 375 AliMUONTrackHitPattern::ApplyMCSCorrections(AliMUONTrackParam& trackParam) const
 376 {
 377   //
 378   /// Returns uncertainties on extrapolated position.
 379   /// Takes into account Branson plane corrections in the iron wall.
 380   //
 381
 382   const Float_t kZFilterOut = AliMUONConstants::MuonFilterZEnd();
 383   const Float_t kFilterThickness = kZFilterOut-AliMUONConstants::MuonFilterZBeg(); // cm
 384
 385   AliMUONTrackExtrap::ExtrapToZCov(&trackParam, kZFilterOut); // Extrap to muon filter end
 386   AliMUONTrackExtrap::AddMCSEffect(&trackParam, kFilterThickness, AliMUONConstants::MuonFilterX0()); // Add MCS effects
 387   return;
 388 }
 389
 390
 391 //______________________________________________________________________________
 392 void
 393 AliMUONTrackHitPattern::FindPadMatchingTrack(const AliMUONVDigitStore& digitStore,
 394                                              const AliMUONTrackParam& trackParam,
 395                                              Bool_t isMatch[2], Int_t iChamber) const
 396 {
 397     //
 398     /// Given the tracker track position, searches for matching digits.
 399     //
 400
 401     Float_t minMatchDist[2];
 402
 403     for(Int_t cath=0; cath<2; ++cath)
 404     {
 405       isMatch[cath]=kFALSE;
 406       minMatchDist[cath]=fkMaxDistance/10.;
 407     }
 408
 409     TIter next(digitStore.CreateIterator());
 410     AliMUONVDigit* mDigit;
 411
 412     while ( ( mDigit = static_cast<AliMUONVDigit*>(next()) ) )
 413     {
 414       Int_t currDetElemId = mDigit->DetElemId();
 415       Int_t currCh = AliMpDEManager::GetChamberId(currDetElemId);
 416       if(currCh!=iChamber) continue;
 417       Int_t cathode = mDigit->Cathode();
 418       Int_t ix = mDigit->PadX();
 419       Int_t iy = mDigit->PadY();
 420       Float_t xpad, ypad, zpad;
 421       const AliMpVSegmentation* seg = AliMpSegmentation::Instance()
 422         ->GetMpSegmentation(currDetElemId,AliMp::GetCathodType(cathode));
 423
 424       AliMpPad pad = seg->PadByIndices(ix,iy,kTRUE);
 425       Float_t xlocal1 = pad.GetPositionX();
 426       Float_t ylocal1 = pad.GetPositionY();
 427       Float_t dpx = pad.GetDimensionX();
 428       Float_t dpy = pad.GetDimensionY();
 429
 430       fkTransformer.Local2Global(currDetElemId, xlocal1, ylocal1, 0, xpad, ypad, zpad);
 431       Float_t matchDist = MinDistanceFromPad(xpad, ypad, zpad, dpx, dpy, trackParam);
 432       if(matchDist>minMatchDist[cathode])continue;
 433       isMatch[cathode] = kTRUE;
 434       if(isMatch[0] && isMatch[1]) break;
 435       minMatchDist[cathode] = matchDist;
 436     }
 437 }
 438
 439
 440 //______________________________________________________________________________
 441 Float_t
 442 AliMUONTrackHitPattern::MinDistanceFromPad(Float_t xPad, Float_t yPad, Float_t zPad,
 443                                            Float_t dpx, Float_t dpy,
 444                                            const AliMUONTrackParam& trackParam) const
 445 {
 446     //
 447     /// Decides if the digit belongs to the tracker track.
 448     //
 449
 450     AliMUONTrackParam trackParamAtPadZ(trackParam);
 451     AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtPadZ, zPad);
 452
 453     Float_t xTrackAtPad = trackParamAtPadZ.GetNonBendingCoor();
 454     Float_t yTrackAtPad = trackParamAtPadZ.GetBendingCoor();
 455
 456     const Float_t kNSigma = GetRecoParam()->GetSigmaCutForTrigger();
 457
 458     const TMatrixD& kCovParam = trackParamAtPadZ.GetCovariances();
 459
 460     Float_t sigmaX = TMath::Sqrt(kCovParam(0,0));
 461     Float_t sigmaY = TMath::Sqrt(kCovParam(2,2));
 462
 463     Float_t maxDistX = kNSigma * sigmaX; // in cm
 464     Float_t maxDistY = kNSigma * sigmaY; // in cm
 465
 466     Float_t deltaX = TMath::Abs(xPad-xTrackAtPad)-dpx;
 467     Float_t deltaY = TMath::Abs(yPad-yTrackAtPad)-dpy;
 468
 469     Float_t matchDist = fkMaxDistance;
 470     if(deltaX<=maxDistX && deltaY<=maxDistY) matchDist = TMath::Max(deltaX, deltaY);
 471
 472     return matchDist;
 473 }
 474
 475
 476 //_____________________________________________________________________________
 477 Int_t AliMUONTrackHitPattern::FindPadMatchingTrig(const AliMUONVDigitStore& digitStore, Int_t &detElemId,
 478                                                   Float_t coor[2], Bool_t isMatch[2],
 479                                                   TArrayI nboard[2], TArrayF &zRealMatch, Float_t y11) const
 480 {
 481     //
 482     /// Check slat and board number of digit matching trigger track
 483     //
 484
 485     enum {kBending, kNonBending};
 486
 487     Float_t minMatchDist[fgkNcathodes];
 488     Int_t padsInCheckArea[fgkNcathodes];
 489
 490     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 491         isMatch[cath] = kFALSE;
 492         minMatchDist[cath] = fkMaxDistance/10.;
 493         padsInCheckArea[cath] = 0;
 494     }
 495     Int_t iChamber = AliMpDEManager::GetChamberId(detElemId);
 496     Int_t ch = iChamber-10;
 497     Float_t oldDeltaZ = AliMUONConstants::DefaultChamberZ(iChamber) - AliMUONConstants::DefaultChamberZ(10);
 498     Float_t y = coor[1];
 499     Int_t iSlat = detElemId%100;
 500     Int_t trigDigitBendPlane = -1;
 501     Int_t foundDetElemId = detElemId;
 502     Float_t foundZmatch=999.;
 503     Float_t yCoorAtPadZ=999.;
 504
 505     TIter next(digitStore.CreateIterator());
 506     AliMUONVDigit* mDigit;
 507     Int_t idigit=0;
 508
 509     while ( ( mDigit = static_cast<AliMUONVDigit*>(next()) ) )
 510     {
 511         idigit++;
 512         Int_t currDetElemId = mDigit->DetElemId();
 513         Int_t currCh = AliMpDEManager::GetChamberId(currDetElemId);
 514         if(currCh!=iChamber) continue;
 515         Int_t currSlat = currDetElemId%100;
 516         Int_t slatDiff = TMath::Abs(currSlat-iSlat);
 517         if(slatDiff>1 && slatDiff<17) continue; // Check neighbour slats
 518         Int_t cathode = mDigit->Cathode();
 519         Int_t ix = mDigit->PadX();
 520         Int_t iy = mDigit->PadY();
 521         Float_t xpad, ypad, zpad;
 522         const AliMpVSegmentation* seg = AliMpSegmentation::Instance()
 523             ->GetMpSegmentation(currDetElemId,AliMp::GetCathodType(cathode));
 524
 525         AliMpPad pad = seg->PadByIndices(ix,iy,kTRUE);
 526         Float_t xlocal1 = pad.GetPositionX();
 527         Float_t ylocal1 = pad.GetPositionY();
 528         Float_t dpx = pad.GetDimensionX();
 529         Float_t dpy = pad.GetDimensionY();
 530
 531         fkTransformer.Local2Global(currDetElemId, xlocal1, ylocal1, 0, xpad, ypad, zpad);
 532         AliDebug(2, Form("\nDetElemId = %i  Cathode = %i  Pad = (%i,%i) = (%.2f,%.2f)  Dim = (%.2f,%.2f)  Track = (%.2f,%.2f)\n",currDetElemId,cathode,ix,iy,xpad,ypad,dpx,dpy,coor[0],coor[1]));
 533         // searching track intersection with chambers (second approximation)
 534         if(ch%2==1){
 535             //if(iChamber%2==1){
 536             Float_t deltaZ = zpad - zRealMatch[0];
 537             y = (coor[1]-y11)*deltaZ/oldDeltaZ + y11;
 538             if(TMath::Abs(y-coor[1])>0.1) AliDebug(3, Form("oldDeltaZ = %7.2f   newDeltaZ = %7.2f\toldY = %7.2f   new y = %7.2f\n",oldDeltaZ,deltaZ,coor[1],y));
 539         }
 540         Float_t matchDist = PadMatchTrack(xpad, ypad, dpx, dpy, coor[0], y);
 541         if(matchDist<fkMaxDistance/2.) padsInCheckArea[cathode]++;
 542         if(matchDist>minMatchDist[cathode])continue;
 543         isMatch[cathode] = kTRUE;
 544         minMatchDist[cathode] = matchDist;
 545         foundDetElemId = currDetElemId;
 546         foundZmatch=zpad;
 547         yCoorAtPadZ=y;
 548         if(cathode==kBending) trigDigitBendPlane = idigit;
 549         for (Int_t loc=0; loc<pad.GetNofLocations(); loc++){
 550             nboard[cathode][loc] = pad.GetLocalBoardId(loc);
 551         }
 552         for(Int_t loc=pad.GetNofLocations(); loc<fgkNlocations; loc++){
 553             nboard[cathode][loc]=-1;
 554         }
 555     }
 556
 557     if(isMatch[kBending] || isMatch[kNonBending]){
 558         detElemId = foundDetElemId;
 559         zRealMatch[ch] = foundZmatch;
 560         coor[1] = yCoorAtPadZ;
 561     }
 562
 563     // If track matches many pads, it is not good for effciency determination.
 564     // However we still want to calculate the hit pattern.
 565     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 566       if(padsInCheckArea[cath]>2) {
 567         AliDebug(1, Form("padsInCheckArea[%i] = %i\n",cath,padsInCheckArea[cath]));
 568         return -500;
 569       }
 570     }
 571
 572     return trigDigitBendPlane;
 573 }
 574
 575 //_____________________________________________________________________________
 576 Float_t AliMUONTrackHitPattern::PadMatchTrack(Float_t xPad, Float_t yPad,
 577                                                 Float_t dpx, Float_t dpy,
 578                                                 Float_t xTrackAtPad, Float_t yTrackAtPad) const
 579 {
 580     //
 581     /// Decides if the digit belongs to the trigger track.
 582     //
 583
 584   Float_t maxDist = GetRecoParam()->GetStripCutForTrigger() * 2. * TMath::Min(dpx,dpy); // cm
 585   if(maxDist<2.) maxDist = 2.;
 586   Float_t maxDistCheckArea = GetRecoParam()->GetMaxStripAreaForTrigger() * 2. *  TMath::Min(dpx,dpy); // cm
 587
 588     Float_t matchDist = fkMaxDistance;
 589
 590     Float_t deltaX = TMath::Abs(xPad-xTrackAtPad)-dpx;
 591     Float_t deltaY = TMath::Abs(yPad-yTrackAtPad)-dpy;
 592     Float_t maxDistX = maxDist;
 593     Float_t maxDistY = maxDist;
 594
 595     if(deltaX<=maxDistX && deltaY<=maxDistY) matchDist = TMath::Max(deltaX, deltaY);
 596     else if(deltaX<=maxDistCheckArea && deltaY<=maxDistCheckArea) matchDist = fkMaxDistance/5.;
 597     return matchDist;
 598 }
 599
 600
 601 //_____________________________________________________________________________
 602 Int_t AliMUONTrackHitPattern::DetElemIdFromPos(Float_t x, Float_t y,
 603                                                  Int_t chamber, Int_t cathode) const
 604 {
 605     //
 606     /// Given the (x,y) position in the chamber,
 607     /// it returns the corresponding slat
 608     //
 609
 610     Int_t resultingDetElemId = -1;
 611     AliMpDEIterator it;
 612     Float_t minDist = 999.;
 613     for ( it.First(chamber-1); ! it.IsDone(); it.Next() ){
 614         Int_t detElemId = it.CurrentDEId();
 615         Int_t ich = detElemId/100-10;
 616         Float_t tolerance=0.2*((Float_t)ich);
 617         Float_t currDist=9999.;
 618
 619         const AliMpVSegmentation* seg =
 620             AliMpSegmentation::Instance()
 621             ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
 622         if (!seg) continue;
 623
 624         Float_t deltax = seg->GetDimensionX();
 625         Float_t deltay = seg->GetDimensionY();
 626         Float_t xlocal1 =  -deltax;
 627         Float_t ylocal1 =  -deltay;
 628         Float_t xlocal2 =  +deltax;
 629         Float_t ylocal2 =  +deltay;
 630         Float_t xg01, yg01, zg1, xg02, yg02, zg2;
 631         fkTransformer.Local2Global(detElemId, xlocal1, ylocal1, 0, xg01, yg01, zg1);
 632         fkTransformer.Local2Global(detElemId, xlocal2, ylocal2, 0, xg02, yg02, zg2);
 633
 634         Float_t xg1 = xg01, xg2 = xg02, yg1 = yg01, yg2 = yg02;
 635
 636         if(xg01>xg02){
 637             xg1 = xg02;
 638             xg2 = xg01;
 639         }
 640         if(yg01>yg02){
 641             yg1 = yg02;
 642             yg2 = yg01;
 643         }
 644
 645         if(x>=xg1-tolerance && x<=xg2+tolerance && y>=yg1-tolerance && y<=yg2+tolerance){ // takes into account errors in extrapolation
 646             if(y<yg1) currDist = yg1-y;
 647             else if(y>yg2) currDist = y-yg2;
 648             if(currDist<minDist) {
 649                 resultingDetElemId = detElemId;
 650                 minDist=currDist;
 651                 continue;
 652             }
 653             resultingDetElemId = detElemId;
 654             break;
 655         }
 656     } // loop on detElemId
 657     return resultingDetElemId;
 658 }
 659
 660
 661 //_____________________________________________________________________________
 662 void AliMUONTrackHitPattern::LocalBoardFromPos(Float_t x, Float_t y,
 663                                                  Int_t detElemId, Int_t cathode,
 664                                                  Int_t localBoard[4]) const
 665 {
 666     //
 667     /// Given the (x,y) position in the chamber,
 668     /// it returns the corresponding local board
 669     //
 670
 671     for(Int_t loc=0; loc<fgkNlocations; loc++){
 672         localBoard[loc]=-1;
 673     }
 674     Float_t xl, yl, zl;
 675     fkTransformer.Global2Local(detElemId, x, y, 0, xl, yl, zl);
 676     TVector2 pos(xl,yl);
 677     const AliMpVSegmentation* seg =
 678         AliMpSegmentation::Instance()
 679           ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
 680     if (seg){
 681         AliMpPad pad = seg->PadByPosition(pos.X(),pos.Y(),kFALSE);
 682         for (Int_t loc=0; loc<pad.GetNofLocations(); loc++){
 683             localBoard[loc] = pad.GetLocalBoardId(loc);
 684         }
 685     }
 686 }
 687
 688
 689 //_____________________________________________________________________________
 690 Bool_t AliMUONTrackHitPattern::PerformTrigTrackMatch(UShort_t &pattern,
 691                                                      const AliMUONTriggerTrack* matchedTrigTrack,
 692                                                      AliMUONVDigitStore& digitStore) const
 693 {
 694   //
 695   /// It searches for matching digits around the trigger track.
 696   //
 697
 698   enum {kBending, kNonBending};
 699
 700   Int_t chOrder[fgkNchambers] = {0,2,1,3};
 701
 702   TArrayF zRealMatch(fgkNchambers);
 703   TArrayF correctFactor(fgkNcathodes);
 704
 705   Bool_t isMatch[fgkNcathodes];
 706   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 707     isMatch[cath] = kFALSE;
 708   }
 709
 710   TArrayF zMeanChamber(fgkNchambers);
 711   for(Int_t ch=0; ch<fgkNchambers; ch++){
 712     zMeanChamber[ch] = AliMUONConstants::DefaultChamberZ(10+ch);
 713   }
 714
 715   TArrayI digitPerTrack(fgkNcathodes);
 716
 717   Float_t trackIntersectCh[fgkNchambers][fgkNcathodes];
 718
 719   TArrayI triggeredDigits;
 720   triggeredDigits.Set(fgkNchambers);
 721   triggeredDigits.Reset(-1);
 722
 723   TArrayI trigScheme[fgkNcathodes];
 724   TArrayI slatThatTriggered[fgkNcathodes];
 725   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 726     trigScheme[cath].Set(fgkNchambers);
 727     slatThatTriggered[cath].Set(fgkNchambers);
 728   }
 729
 730   Int_t boardThatTriggered[fgkNchambers][fgkNcathodes][fgkNlocations];
 731   TArrayI nboard[fgkNcathodes];
 732   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 733     nboard[cath].Set(fgkNlocations);
 734   }
 735   Int_t ineffBoard[fgkNlocations];
 736   for(Int_t loc=0; loc<fgkNlocations; loc++){
 737     ineffBoard[loc] = -1;
 738   }
 739
 740   digitPerTrack.Reset();
 741   for(Int_t ch=0; ch<fgkNchambers; ch++){
 742     zRealMatch[ch] = zMeanChamber[ch];
 743     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 744       for(Int_t loc=0; loc<fgkNlocations; loc++){
 745         boardThatTriggered[ch][cath][loc]=-1;
 746       }
 747     }
 748   }
 749
 750   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 751     slatThatTriggered[cath].Reset(-1);
 752     trigScheme[cath].Reset();
 753   }
 754
 755   Bool_t isClearEvent = kTRUE;
 756
 757   //Float_t x11 = matchedTrigTrack->GetX11();// x position (info from non-bending plane)
 758   Float_t y11 = matchedTrigTrack->GetY11();// y position (info from bending plane)
 759   Float_t thetaX = matchedTrigTrack->GetThetax();
 760   Float_t thetaY = matchedTrigTrack->GetThetay();
 761
 762   for(Int_t ch=0; ch<fgkNchambers; ch++) { // chamber loop
 763     Int_t currCh = chOrder[ch];
 764     AliDebug(3, Form("zMeanChamber[%i] = %.2f\tzRealMatch[0] = %.2f\n",currCh,zMeanChamber[currCh],zRealMatch[0]));
 765
 766     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 767       correctFactor[cath]=1.;
 768     }
 769     // calculate corrections to trigger track theta
 770     if(ch>=1) correctFactor[kNonBending] = zMeanChamber[0]/zRealMatch[0];// corrects x position
 771     if(ch>=2) correctFactor[kBending] = (zMeanChamber[2] - zMeanChamber[0]) / (zRealMatch[2] - zRealMatch[0]);// corrects y position
 772
 773     // searching track intersection with chambers (first approximation)
 774     Float_t deltaZ = zMeanChamber[currCh] - zMeanChamber[0];
 775     trackIntersectCh[currCh][0] = zMeanChamber[currCh] * TMath::Tan(thetaX) * correctFactor[kNonBending];// x position (info from non-bending plane)
 776     trackIntersectCh[currCh][1] = y11 + deltaZ * TMath::Tan(thetaY) * correctFactor[kBending];// y position (info from bending plane)
 777     Int_t detElemIdFromTrack = DetElemIdFromPos(trackIntersectCh[currCh][0], trackIntersectCh[currCh][1], 11+currCh, 0);
 778     if(detElemIdFromTrack<0) {
 779       AliDebug(1, "Warning: trigger track outside trigger chamber\n");
 780       isClearEvent = kFALSE;
 781
 782       // track is rejected since the extrapolated track
 783       // does not match a slat (border effects)
 784       AliESDMuonTrack::AddEffInfo(pattern, AliESDMuonTrack::kTrackOutsideGeometry);
 785       continue;
 786     }
 787
 788     triggeredDigits[currCh] = FindPadMatchingTrig(digitStore, detElemIdFromTrack, trackIntersectCh[currCh], isMatch, nboard, zRealMatch, y11);
 789
 790     // if FindPadMatchingTrig = -500 => too many digits matching pad =>
 791     //                               => Event not clear => Do not use for efficiency calculation
 792     if(triggeredDigits[currCh]<-100){
 793       isClearEvent = kFALSE;
 794       // track is rejected since it matches many pads
 795       AliESDMuonTrack::AddEffInfo(pattern, AliESDMuonTrack::kTrackMatchesManyPads);
 796       AliDebug(1, Form("Warning: track = %p (%i) matches many pads. Rejected!\n",(void *)matchedTrigTrack, detElemIdFromTrack));
 797     }
 798
 799     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 800       if(!isMatch[cath]) continue;
 801       AliESDMuonTrack::SetFiredChamber(pattern, cath, currCh);
 802       digitPerTrack[cath]++;
 803       trigScheme[cath][currCh]++;
 804       slatThatTriggered[cath][currCh] = detElemIdFromTrack;
 805       for(Int_t loc=0; loc<fgkNlocations; loc++){
 806         boardThatTriggered[currCh][cath][loc] = nboard[cath][loc];
 807       }
 808     }
 809   } // end chamber loop
 810
 811   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 812     if(digitPerTrack[cath]<3) {
 813       isClearEvent = kFALSE;
 814       // track is rejected since the number of associated
 815       // digits found is less than 3.
 816       AliESDMuonTrack::AddEffInfo(pattern, AliESDMuonTrack::kTrackMatchesFewPads);
 817       AliDebug(1, Form("Warning: found %i digits for trigger track cathode %i.\nRejecting event\n", digitPerTrack[cath],cath));
 818     }
 819   }
 820
 821   if(!isClearEvent) return kFALSE;
 822
 823   AliESDMuonTrack::EAliTriggerChPatternFlag goodForEff = AliESDMuonTrack::kBoardEff;
 824
 825   Int_t ineffSlat = -1;
 826   Int_t ineffDetElId = -1;
 827   Int_t firstSlat = slatThatTriggered[kBending][0]%100;
 828   if(firstSlat<0) firstSlat = slatThatTriggered[kBending][1]%100;
 829   Int_t firstBoard = boardThatTriggered[0][kBending][0];
 830   if(firstBoard<0) firstBoard = boardThatTriggered[1][kBending][0];
 831   for(Int_t ch=0; ch<fgkNchambers; ch++){
 832     Bool_t isCurrChIneff = kFALSE;
 833     Int_t currSlat = slatThatTriggered[kBending][ch]%100;
 834     if(currSlat<0){
 835       ineffDetElId = DetElemIdFromPos(trackIntersectCh[ch][0], trackIntersectCh[ch][1], 11+ch, kBending);
 836       currSlat = ineffDetElId%100;
 837       ineffSlat = currSlat;
 838       isCurrChIneff = kTRUE;
 839     }
 840     if(currSlat!=firstSlat) {
 841       AliESDMuonTrack::AddEffInfo(pattern,
 842                                   AliESDMuonTrack::kCrossDifferentSlats,
 843                                   AliESDMuonTrack::kChEff); // track crosses different slats
 844       return kTRUE;
 845     }
 846     Bool_t atLeastOneLoc=kFALSE;
 847     if(isCurrChIneff) LocalBoardFromPos(trackIntersectCh[ch][0], trackIntersectCh[ch][1], ineffDetElId, kBending, ineffBoard);
 848     for(Int_t loc=0; loc<fgkNlocations; loc++){
 849       Int_t currBoard = boardThatTriggered[ch][kBending][loc];
 850       if(isCurrChIneff) currBoard = ineffBoard[loc];
 851       if(currBoard==firstBoard){
 852         atLeastOneLoc=kTRUE;
 853         break;
 854       }
 855     }
 856     if(!atLeastOneLoc) goodForEff = AliESDMuonTrack::kSlatEff;
 857   } // end chamber loop
 858
 859   AliESDMuonTrack::AddEffInfo(pattern, firstSlat, goodForEff);
 860   return kTRUE;
 861 }