MUON/AliMUONTrackHitPattern.cxx

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   3  *                                                                        *
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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 /// The hit pattern is a UShort_t with 8 bits used:
  27 ///                                                                      <pre>
  28 ///            1  1  0  1    1  1  0  1
  29 ///           |           |            |
  30 ///            ----------- ------------
  31 /// chamber:  11 12 13 14 | 11 12 13 14
  32 /// cathode:    bending   | non-bending
  33 ///                                                                      </pre>
  34 /// The main method is:
  35 /// * ExecuteValidation
  36 ///
  37 ///  \author Diego Stocco
  38 //-----------------------------------------------------------------------------
  39
  40
  41 #include "AliMUONTrackHitPattern.h"
  42
  43 #include "AliMUONConstants.h"
  44 #include "AliMUONVDigit.h"
  45 #include "AliMUONDigitMaker.h"
  46 #include "AliMUONDigitStoreV1.h"
  47 #include "AliMUONGeometryTransformer.h"
  48 #include "AliMUONLocalTrigger.h"
  49 #include "AliMUONLocalTriggerBoard.h"
  50 #include "AliMUONTrack.h"
  51 #include "AliMUONTrackExtrap.h"
  52 #include "AliMUONTrackParam.h"
  53 #include "AliMUONVTrackStore.h"
  54 #include "AliMUONVTriggerStore.h"
  55 #include "AliMpPad.h"
  56 #include "AliMpSegmentation.h"
  57 #include "AliMpVSegmentation.h"
  58 #include "AliMpDEManager.h"
  59 #include "AliMUONReconstructor.h"
  60 #include "AliMUONRecoParam.h"
  61 #include "AliMUONTriggerTrack.h"
  62 #include "AliMUONVTriggerTrackStore.h"
  63
  64 #include "AliMpConstants.h"
  65
  66 #include "AliMagF.h"
  67 #include "AliLog.h"
  68 #include "AliTracker.h"
  69
  70 #include <Riostream.h>
  71 #include <TArrayS.h>
  72 #include <TClonesArray.h>
  73 #include <TMath.h>
  74 #include <TMatrixD.h>
  75 #include <TROOT.h>
  76 #include <TDirectory.h>
  77 #include <TFile.h>
  78 #include <TSystem.h>
  79
  80 #include <cassert>
  81
  82 /// \cond CLASSIMP
  83 ClassImp(AliMUONTrackHitPattern) // Class implementation in ROOT context
  84 /// \endcond
  85
  86
  87 //______________________________________________________________________________
  88 AliMUONTrackHitPattern::AliMUONTrackHitPattern(const AliMUONGeometryTransformer& transformer,
  89                                                const AliMUONDigitMaker& digitMaker)
  90     : TObject(),
  91       fTransformer(transformer),
  92       fDigitMaker(digitMaker),
  93       fkMaxDistance(99999.)
  94 {
  95     /// Default constructor
  96     InitMembers();
  97
  98     // Set magnetic field
  99     const AliMagF* kField = AliTracker::GetFieldMap();
 100     if (!kField) AliFatal("No field available");
 101     AliMUONTrackExtrap::SetField(kField);
 102 }
 103
 104
 105 //______________________________________________________________________________
 106 AliMUONTrackHitPattern::~AliMUONTrackHitPattern(void)
 107 {
 108   /// Destructor
 109   delete fTrigCovariance;
 110 }
 111
 112
 113 //______________________________________________________________________________
 114 void AliMUONTrackHitPattern::InitMembers()
 115 {
 116   //
 117   /// Initialize data members
 118   //
 119   fDeltaZ = TMath::Abs(AliMUONConstants::DefaultChamberZ(12) - AliMUONConstants::DefaultChamberZ(10));
 120
 121   const Double_t kTrigNonBendReso = AliMUONConstants::TriggerNonBendingReso();
 122   const Double_t kTrigBendReso = AliMUONConstants::TriggerBendingReso();
 123   const Double_t kTrigSlopeBendReso = 1.414 * AliMUONConstants::TriggerBendingReso()/fDeltaZ;
 124   const Double_t kTrigCovSlopeBend = - kTrigBendReso * kTrigBendReso / fDeltaZ;
 125
 126   // Covariance matrix 3x3 (X,Y,slopeY) for trigger tracks
 127   fTrigCovariance = new TMatrixD(3,3);
 128   fTrigCovariance->Zero();
 129   (*fTrigCovariance)(0,0) = kTrigNonBendReso * kTrigNonBendReso;
 130   (*fTrigCovariance)(1,1) = kTrigBendReso * kTrigBendReso;
 131   (*fTrigCovariance)(2,2) = kTrigSlopeBendReso * kTrigSlopeBendReso;
 132   (*fTrigCovariance)(1,2) = (*fTrigCovariance)(2,1) = kTrigCovSlopeBend;
 133 }
 134
 135
 136 //_____________________________________________________________________________
 137 void AliMUONTrackHitPattern::CheckConstants() const
 138 {
 139 /// Check consistence of redefined constants
 140
 141   assert(fgkNcathodes == AliMpConstants::NofCathodes());
 142   assert(fgkNchambers == AliMpConstants::NofTriggerChambers());
 143   assert(fgkNplanes == AliMpConstants::NofTriggerChambers() * fgkNcathodes);
 144 }
 145
 146
 147 //______________________________________________________________________________
 148 void AliMUONTrackHitPattern::ExecuteValidation(AliMUONVTrackStore& trackStore,
 149                                                const AliMUONVTriggerTrackStore& triggerTrackStore,
 150                                                const AliMUONVTriggerStore& triggerStore) const
 151 {
 152   //
 153   /// Main method:
 154   /// Loops on reco tracks, extrapolates them to trigger chambers
 155   /// and searches for matching trigger tracks and digits
 156   //
 157
 158   AliMUONDigitStoreV1 digitStore;
 159   TriggerDigits(triggerStore,digitStore);
 160
 161
 162   TIter itTrack(trackStore.CreateIterator());
 163   AliMUONTrack* track;
 164
 165   const Int_t kFirstTrigCh = AliMUONConstants::NTrackingCh();
 166
 167   while ( ( track = static_cast<AliMUONTrack*>(itTrack()) ) )
 168   {
 169     AliMUONTrackParam trackParam(*((AliMUONTrackParam*) (track->GetTrackParamAtCluster()->Last())));
 170
 171     ApplyMCSCorrections(trackParam);
 172     AliMUONTrackExtrap::ExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(kFirstTrigCh)); // extrap to 1st trigger chamber
 173
 174     AliMUONTriggerTrack *matchedTriggerTrack = MatchTriggerTrack(track, trackParam, triggerTrackStore, triggerStore);
 175
 176     UShort_t pattern = GetHitPattern(trackParam, matchedTriggerTrack, digitStore);
 177     track->SetHitsPatternInTrigCh(pattern);
 178   }
 179 }
 180
 181
 182 //______________________________________________________________________________
 183 AliMUONTriggerTrack *
 184 AliMUONTrackHitPattern::MatchTriggerTrack(AliMUONTrack* track,
 185                                           AliMUONTrackParam& trackParam,
 186                                           const AliMUONVTriggerTrackStore& triggerTrackStore,
 187                                           const AliMUONVTriggerStore& triggerStore) const
 188 {
 189   //
 190   /// Match track with trigger track
 191   //
 192
 193   Int_t matchTrigger = 0;
 194   Int_t loTrgNum(-1);
 195   Double_t distTriggerTrack[3], sigma2[3];
 196   Double_t chi2;
 197   Double_t chi2MatchTrigger = 0., minChi2MatchTrigger = 999.;
 198   Int_t doubleMatch = -1; // Check if track matches 2 trigger tracks
 199   Double_t doubleChi2 = -1.;
 200   AliMUONTriggerTrack* doubleTriggerTrack = 0x0;
 201   AliMUONTriggerTrack* matchedTriggerTrack = 0x0;
 202
 203   const TMatrixD& kParamCov = trackParam.GetCovariances();
 204
 205   Double_t xTrack = trackParam.GetNonBendingCoor();
 206   Double_t yTrack = trackParam.GetBendingCoor();
 207   Double_t ySlopeTrack = trackParam.GetBendingSlope();
 208
 209   // Covariance matrix 3x3 (X,Y,slopeY) for tracker tracks
 210   TMatrixD trackCov(3,3);
 211   trackCov.Zero();
 212   trackCov(0,0) = kParamCov(0,0);
 213   trackCov(1,1) = kParamCov(2,2);
 214   trackCov(2,2) = kParamCov(3,3);
 215   trackCov(1,2) = kParamCov(2,3);
 216   trackCov(2,1) = kParamCov(3,2);
 217
 218   TMatrixD sumCov(trackCov,TMatrixD::kPlus,*fTrigCovariance);
 219
 220   Bool_t isCovOK = kTRUE;
 221
 222   if (sumCov.Determinant() != 0) {
 223     sumCov.Invert();
 224   } else {
 225     AliWarning(" Determinant = 0");
 226     isCovOK = kFALSE;
 227     sigma2[0] = kParamCov(0,0);
 228     sigma2[1] = kParamCov(2,2);
 229     sigma2[2] = kParamCov(3,3);
 230     // sigma of distributions (trigger-track) X,Y,slopeY
 231     const Double_t kDistSigma[3]={AliMUONConstants::TriggerNonBendingReso(),
 232                                   AliMUONConstants::TriggerBendingReso(),
 233                                   1.414 * AliMUONConstants::TriggerBendingReso()/fDeltaZ};
 234     for (Int_t iVar = 0; iVar < 3; iVar++) sigma2[iVar] += kDistSigma[iVar] * kDistSigma[iVar];
 235   }
 236
 237   AliMUONTriggerTrack *triggerTrack;
 238   TIter itTriggerTrack(triggerTrackStore.CreateIterator());
 239   while ( ( triggerTrack = static_cast<AliMUONTriggerTrack*>(itTriggerTrack() ) ) )
 240   {
 241     distTriggerTrack[0] = triggerTrack->GetX11() - xTrack;
 242     distTriggerTrack[1] = triggerTrack->GetY11() - yTrack;
 243     distTriggerTrack[2] = TMath::Tan(triggerTrack->GetThetay()) - ySlopeTrack;
 244
 245     if(isCovOK){
 246       TMatrixD paramDiff(3,1);
 247       for(Int_t iVar = 0; iVar < 3; iVar++)
 248         paramDiff(iVar,0) = distTriggerTrack[iVar];
 249
 250       TMatrixD tmp(sumCov,TMatrixD::kMult,paramDiff);
 251       TMatrixD chi2M(paramDiff,TMatrixD::kTransposeMult,tmp);
 252       chi2 = chi2M(0,0);
 253     }
 254     else {
 255       chi2 = 0.;
 256       for (Int_t iVar = 0; iVar < 3; iVar++) chi2 += distTriggerTrack[iVar]*distTriggerTrack[iVar]/sigma2[iVar];
 257     }
 258
 259     chi2 /= 3.; // Normalized Chi2: 3 degrees of freedom (X,Y,slopeY)
 260     if (chi2 < AliMUONReconstructor::GetRecoParam()->GetMaxNormChi2MatchTrigger())
 261     {
 262       Bool_t isDoubleTrack = (TMath::Abs(chi2 - minChi2MatchTrigger)<1.);
 263       if (chi2 < minChi2MatchTrigger && chi2 < AliMUONReconstructor::GetRecoParam()->GetMaxNormChi2MatchTrigger())
 264       {
 265         if(isDoubleTrack)
 266         {
 267           doubleMatch = loTrgNum;
 268           doubleChi2 = chi2MatchTrigger;
 269           doubleTriggerTrack = matchedTriggerTrack;
 270         }
 271         minChi2MatchTrigger = chi2;
 272         chi2MatchTrigger = chi2;
 273         loTrgNum = triggerTrack->GetLoTrgNum();
 274         matchedTriggerTrack = triggerTrack;
 275         AliMUONLocalTrigger* locTrg = triggerStore.FindLocal(loTrgNum);
 276         matchTrigger = 1;
 277         if(locTrg->LoLpt()>0) matchTrigger = 2;
 278         if(locTrg->LoHpt()>0) matchTrigger = 3;
 279       }
 280       else if(isDoubleTrack)
 281       {
 282         doubleMatch = triggerTrack->GetLoTrgNum();
 283         doubleChi2 = chi2;
 284       }
 285     }
 286   }
 287   if(doubleMatch>=0)
 288   { // If two trigger tracks match, select the one passing more trigger cuts
 289     AliDebug(1, Form("Two candidates found: %i and %i",loTrgNum,doubleMatch));
 290     AliMUONLocalTrigger* locTrg1 = triggerStore.FindLocal(doubleMatch);
 291     if((locTrg1->LoLpt()>0 && matchTrigger<2) || (locTrg1->LoHpt() && matchTrigger<3))
 292     {
 293       if(locTrg1->LoHpt()>0) matchTrigger=3;
 294       else matchTrigger = 2;
 295       loTrgNum = doubleMatch;
 296       chi2MatchTrigger = doubleChi2;
 297       matchedTriggerTrack = doubleTriggerTrack;
 298     }
 299   }
 300
 301   track->SetMatchTrigger(matchTrigger);
 302   track->SetLoTrgNum(loTrgNum);
 303   track->SetChi2MatchTrigger(chi2MatchTrigger);
 304
 305   AliMUONLocalTrigger* locTrg = static_cast<AliMUONLocalTrigger*>(triggerStore.FindLocal(loTrgNum));
 306
 307   if (locTrg)
 308   {
 309     track->SetLocalTrigger(locTrg->LoCircuit(),
 310                            locTrg->LoStripX(),
 311                            locTrg->LoStripY(),
 312                            locTrg->LoDev(),
 313                            locTrg->LoLpt(),
 314                            locTrg->LoHpt());
 315   }
 316
 317   return matchedTriggerTrack;
 318 }
 319
 320
 321 //______________________________________________________________________________
 322 UShort_t AliMUONTrackHitPattern::GetHitPattern(AliMUONTrackParam &trackParam,
 323                                                AliMUONTriggerTrack* matchedTriggerTrack,
 324                                                AliMUONVDigitStore& digitStore) const
 325 {
 326   //
 327   /// Get hit pattern on trigger chambers for the current track
 328   //
 329   UShort_t pattern = 0;
 330   Bool_t isMatch[2];
 331   const Int_t kNTrackingCh = AliMUONConstants::NTrackingCh();
 332
 333   Bool_t patternFromTrigTrack = kFALSE;
 334
 335
 336   // Calculate hit pattern from trigger track
 337   if(matchedTriggerTrack){
 338     patternFromTrigTrack = PerformTrigTrackMatch(pattern, matchedTriggerTrack, digitStore);
 339   }
 340
 341   if(patternFromTrigTrack) return pattern;
 342
 343
 344   // Calculate hit pattern from tracker track propagation
 345   // if hit pattern from trigger track failed
 346
 347   for(Int_t ch=0; ch<4; ++ch)
 348   {
 349     Int_t iChamber = kNTrackingCh+ch;
 350     AliMUONTrackExtrap::ExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(iChamber));
 351     FindPadMatchingTrack(digitStore, trackParam, isMatch, iChamber);
 352     for(Int_t cath=0; cath<2; ++cath)
 353     {
 354       if(isMatch[cath]) SetBit(pattern, cath, ch);
 355     }
 356   }
 357   return pattern;
 358 }
 359
 360
 361 //______________________________________________________________________________
 362 void AliMUONTrackHitPattern::SetBit(UShort_t& pattern, Int_t cathode, Int_t chamber) const
 363 {
 364   //
 365   /// Set hits pattern
 366   //
 367   const Int_t kMask[2][4]= {{0x80, 0x40, 0x20, 0x10},
 368                             {0x08, 0x04, 0x02, 0x01}};
 369   pattern |= kMask[cathode][chamber];
 370 }
 371
 372
 373 //______________________________________________________________________________
 374 void AliMUONTrackHitPattern::AddEffInfo(UShort_t& pattern, Int_t slat, Int_t effType) const
 375 {
 376   //
 377   /// Set info on efficiency calculation
 378   //
 379   pattern += effType << 8;
 380   pattern += slat << 10;
 381 }
 382
 383
 384 //______________________________________________________________________________
 385 void
 386 AliMUONTrackHitPattern::ApplyMCSCorrections(AliMUONTrackParam& trackParam) const
 387 {
 388   //
 389   /// Returns uncertainties on extrapolated position.
 390   /// Takes into account Branson plane corrections in the iron wall.
 391   //
 392
 393   const Float_t kZFilterOut = AliMUONConstants::MuonFilterZEnd();
 394   const Float_t kFilterThickness = TMath::Abs(kZFilterOut-AliMUONConstants::MuonFilterZBeg()); // cm
 395
 396   AliMUONTrackExtrap::ExtrapToZCov(&trackParam, kZFilterOut); // Extrap to muon filter end
 397   AliMUONTrackExtrap::AddMCSEffect(&trackParam, kFilterThickness, AliMUONConstants::MuonFilterX0()); // Add MCS effects
 398   return;
 399 }
 400
 401
 402 //______________________________________________________________________________
 403 Bool_t
 404 AliMUONTrackHitPattern::TriggerDigits(const AliMUONVTriggerStore& triggerStore,
 405                                       AliMUONVDigitStore& digitStore) const
 406 {
 407   //
 408   /// make (S)Digit for trigger
 409   //
 410
 411   digitStore.Clear();
 412
 413   AliMUONLocalTrigger* locTrg;
 414   TIter next(triggerStore.CreateLocalIterator());
 415
 416   while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) )
 417   {
 418     if (locTrg->IsNull()) continue;
 419
 420     TArrayS xyPattern[2];
 421     locTrg->GetXPattern(xyPattern[0]);
 422     locTrg->GetYPattern(xyPattern[1]);
 423
 424     // do we need this ? (Ch.F.)
 425 //     for(Int_t cath=0; cath<2; ++cath)
 426 //     {
 427 //       for(Int_t ch=0; ch<4; ++ch)
 428 //       {
 429 //         if(xyPattern[cath][ch]==0) continue;
 430 //       }
 431 //     }
 432
 433     Int_t nBoard = locTrg->LoCircuit();
 434     fDigitMaker.TriggerDigits(nBoard, xyPattern, digitStore);
 435   }
 436   return kTRUE;
 437 }
 438
 439
 440 //______________________________________________________________________________
 441 void
 442 AliMUONTrackHitPattern::FindPadMatchingTrack(AliMUONVDigitStore& digitStore,
 443                                              const AliMUONTrackParam& trackParam,
 444                                              Bool_t isMatch[2], Int_t iChamber) const
 445 {
 446     //
 447     /// Given the tracker track position, searches for matching digits.
 448     //
 449
 450     Float_t minMatchDist[2];
 451
 452     for(Int_t cath=0; cath<2; ++cath)
 453     {
 454       isMatch[cath]=kFALSE;
 455       minMatchDist[cath]=fkMaxDistance/10.;
 456     }
 457
 458     TIter next(digitStore.CreateIterator());
 459     AliMUONVDigit* mDigit;
 460
 461     while ( ( mDigit = static_cast<AliMUONVDigit*>(next()) ) )
 462     {
 463       Int_t currDetElemId = mDigit->DetElemId();
 464       Int_t currCh = AliMpDEManager::GetChamberId(currDetElemId);
 465       if(currCh!=iChamber) continue;
 466       Int_t cathode = mDigit->Cathode();
 467       Int_t ix = mDigit->PadX();
 468       Int_t iy = mDigit->PadY();
 469       Float_t xpad, ypad, zpad;
 470       const AliMpVSegmentation* seg = AliMpSegmentation::Instance()
 471         ->GetMpSegmentation(currDetElemId,AliMp::GetCathodType(cathode));
 472
 473       AliMpPad pad = seg->PadByIndices(AliMpIntPair(ix,iy),kTRUE);
 474       Float_t xlocal1 = pad.Position().X();
 475       Float_t ylocal1 = pad.Position().Y();
 476       Float_t dpx = pad.Dimensions().X();
 477       Float_t dpy = pad.Dimensions().Y();
 478       fTransformer.Local2Global(currDetElemId, xlocal1, ylocal1, 0, xpad, ypad, zpad);
 479       Float_t matchDist = MinDistanceFromPad(xpad, ypad, zpad, dpx, dpy, trackParam);
 480       if(matchDist>minMatchDist[cathode])continue;
 481       isMatch[cathode] = kTRUE;
 482       if(isMatch[0] && isMatch[1]) break;
 483       minMatchDist[cathode] = matchDist;
 484     }
 485 }
 486
 487
 488 //______________________________________________________________________________
 489 Float_t
 490 AliMUONTrackHitPattern::MinDistanceFromPad(Float_t xPad, Float_t yPad, Float_t zPad,
 491                                            Float_t dpx, Float_t dpy,
 492                                            const AliMUONTrackParam& trackParam) const
 493 {
 494     //
 495     /// Decides if the digit belongs to the tracker track.
 496     //
 497
 498     AliMUONTrackParam trackParamAtPadZ(trackParam);
 499     AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtPadZ, zPad);
 500
 501     Float_t xTrackAtPad = trackParamAtPadZ.GetNonBendingCoor();
 502     Float_t yTrackAtPad = trackParamAtPadZ.GetBendingCoor();
 503
 504     const Float_t kNSigma = AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTrigger();
 505
 506     const TMatrixD& kCovParam = trackParamAtPadZ.GetCovariances();
 507
 508     Float_t sigmaX = TMath::Sqrt(kCovParam(0,0));
 509     Float_t sigmaY = TMath::Sqrt(kCovParam(2,2));
 510
 511     Float_t maxDistX = kNSigma * sigmaX; // in cm
 512     Float_t maxDistY = kNSigma * sigmaY; // in cm
 513
 514     Float_t deltaX = TMath::Abs(xPad-xTrackAtPad)-dpx;
 515     Float_t deltaY = TMath::Abs(yPad-yTrackAtPad)-dpy;
 516
 517     Float_t matchDist = fkMaxDistance;
 518     if(deltaX<=maxDistX && deltaY<=maxDistY) matchDist = TMath::Max(deltaX, deltaY);
 519
 520     return matchDist;
 521 }
 522
 523
 524 //_____________________________________________________________________________
 525 Int_t AliMUONTrackHitPattern::FindPadMatchingTrig(AliMUONVDigitStore& digitStore, Int_t &detElemId,
 526                                                   Float_t coor[2], Bool_t isMatch[2],
 527                                                   TArrayI nboard[2], TArrayF &zRealMatch, Float_t y11) const
 528 {
 529     //
 530     /// Check slat and board number of digit matching trigger track
 531     //
 532
 533     enum {kBending, kNonBending};
 534
 535     Float_t minMatchDist[fgkNcathodes];
 536     Int_t padsInCheckArea[fgkNcathodes];
 537
 538     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 539         isMatch[cath] = kFALSE;
 540         minMatchDist[cath] = fkMaxDistance/10.;
 541         padsInCheckArea[cath] = 0;
 542     }
 543     Int_t iChamber = AliMpDEManager::GetChamberId(detElemId);
 544     Int_t ch = iChamber-10;
 545     Float_t oldDeltaZ = AliMUONConstants::DefaultChamberZ(iChamber) - AliMUONConstants::DefaultChamberZ(10);
 546     Float_t y = coor[1];
 547     Int_t iSlat = detElemId%100;
 548     Int_t trigDigitBendPlane = -1;
 549     Int_t foundDetElemId = detElemId;
 550     Float_t foundZmatch=999.;
 551     Float_t yCoorAtPadZ=999.;
 552
 553     TIter next(digitStore.CreateIterator());
 554     AliMUONVDigit* mDigit;
 555     Int_t idigit=0;
 556
 557     while ( ( mDigit = static_cast<AliMUONVDigit*>(next()) ) )
 558     {
 559         idigit++;
 560         Int_t currDetElemId = mDigit->DetElemId();
 561         Int_t currCh = AliMpDEManager::GetChamberId(currDetElemId);
 562         if(currCh!=iChamber) continue;
 563         Int_t currSlat = currDetElemId%100;
 564         Int_t slatDiff = TMath::Abs(currSlat-iSlat);
 565         if(slatDiff>1 && slatDiff<17) continue; // Check neighbour slats
 566         Int_t cathode = mDigit->Cathode();
 567         Int_t ix = mDigit->PadX();
 568         Int_t iy = mDigit->PadY();
 569         Float_t xpad, ypad, zpad;
 570         const AliMpVSegmentation* seg = AliMpSegmentation::Instance()
 571             ->GetMpSegmentation(currDetElemId,AliMp::GetCathodType(cathode));
 572
 573         AliMpPad pad = seg->PadByIndices(AliMpIntPair(ix,iy),kTRUE);
 574         Float_t xlocal1 = pad.Position().X();
 575         Float_t ylocal1 = pad.Position().Y();
 576         Float_t dpx = pad.Dimensions().X();
 577         Float_t dpy = pad.Dimensions().Y();
 578         fTransformer.Local2Global(currDetElemId, xlocal1, ylocal1, 0, xpad, ypad, zpad);
 579         AliDebug(2, Form("DetElemId = %i\tCathode = %i\t(x,y) Pad = (%i,%i) = (%.2f,%.2f)\tDim = (%.2f,%.2f)\tTrack = (%.2f,%.2f)\n",currDetElemId,cathode,ix,iy,xpad,ypad,dpx,dpy,coor[0],coor[1]));
 580         // searching track intersection with chambers (second approximation)
 581         if(ch%2==1){
 582             //if(iChamber%2==1){
 583             Float_t deltaZ = zpad - zRealMatch[0];
 584             y = (coor[1]-y11)*deltaZ/oldDeltaZ + y11;
 585             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));
 586         }
 587         Float_t matchDist = PadMatchTrack(xpad, ypad, dpx, dpy, coor[0], y);
 588         if(matchDist<fkMaxDistance/2.) padsInCheckArea[cathode]++;
 589         if(matchDist>minMatchDist[cathode])continue;
 590         isMatch[cathode] = kTRUE;
 591         minMatchDist[cathode] = matchDist;
 592         foundDetElemId = currDetElemId;
 593         foundZmatch=zpad;
 594         yCoorAtPadZ=y;
 595         if(cathode==kBending) trigDigitBendPlane = idigit;
 596         for (Int_t loc=0; loc<pad.GetNofLocations(); loc++){
 597             AliMpIntPair location = pad.GetLocation(loc);
 598             nboard[cathode][loc] = location.GetFirst();
 599         }
 600         for(Int_t loc=pad.GetNofLocations(); loc<fgkNlocations; loc++){
 601             nboard[cathode][loc]=-1;
 602         }
 603     }
 604
 605     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 606         if(padsInCheckArea[cath]>2) {
 607           AliDebug(1, Form("padsInCheckArea[%i] = %i\n",cath,padsInCheckArea[cath]));
 608             return -500;
 609         }
 610     }
 611
 612     if(isMatch[kBending] || isMatch[kNonBending]){
 613         detElemId = foundDetElemId;
 614         zRealMatch[ch] = foundZmatch;
 615         coor[1] = yCoorAtPadZ;
 616     }
 617     return trigDigitBendPlane;
 618 }
 619
 620 //_____________________________________________________________________________
 621 Float_t AliMUONTrackHitPattern::PadMatchTrack(Float_t xPad, Float_t yPad,
 622                                                 Float_t dpx, Float_t dpy,
 623                                                 Float_t xTrackAtPad, Float_t yTrackAtPad) const
 624 {
 625     //
 626     /// Decides if the digit belongs to the trigger track.
 627     //
 628
 629     Float_t maxDist = 2.;//3. // cm
 630     Float_t maxDistCheckArea = 6.; // cm
 631
 632     Float_t matchDist = fkMaxDistance;
 633
 634     Float_t deltaX = TMath::Abs(xPad-xTrackAtPad)-dpx;
 635     Float_t deltaY = TMath::Abs(yPad-yTrackAtPad)-dpy;
 636     Float_t maxDistX = maxDist;
 637     Float_t maxDistY = maxDist;
 638
 639     if(deltaX<=maxDistX && deltaY<=maxDistY) matchDist = TMath::Max(deltaX, deltaY);
 640     else if(deltaX<=maxDistCheckArea && deltaY<=maxDistCheckArea) matchDist = fkMaxDistance/5.;
 641     return matchDist;
 642 }
 643
 644
 645 //_____________________________________________________________________________
 646 Int_t AliMUONTrackHitPattern::DetElemIdFromPos(Float_t x, Float_t y,
 647                                                  Int_t chamber, Int_t cathode) const
 648 {
 649     //
 650     /// Given the (x,y) position in the chamber,
 651     /// it returns the corresponding slat
 652     //
 653
 654     Int_t resultingDetElemId = -1;
 655     AliMpDEIterator it;
 656     Float_t minDist = 999.;
 657     for ( it.First(chamber-1); ! it.IsDone(); it.Next() ){
 658         Int_t detElemId = it.CurrentDEId();
 659         Int_t ich = detElemId/100-10;
 660         Float_t tolerance=0.2*((Float_t)ich);
 661         Float_t currDist=9999.;
 662
 663         const AliMpVSegmentation* seg =
 664             AliMpSegmentation::Instance()
 665             ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
 666         if (!seg) continue;
 667
 668         Float_t deltax = seg->Dimensions().X();
 669         Float_t deltay = seg->Dimensions().Y();
 670         Float_t xlocal1 =  -deltax;
 671         Float_t ylocal1 =  -deltay;
 672         Float_t xlocal2 =  +deltax;
 673         Float_t ylocal2 =  +deltay;
 674         Float_t xg01, yg01, zg1, xg02, yg02, zg2;
 675         fTransformer.Local2Global(detElemId, xlocal1, ylocal1, 0, xg01, yg01, zg1);
 676         fTransformer.Local2Global(detElemId, xlocal2, ylocal2, 0, xg02, yg02, zg2);
 677
 678         Float_t xg1 = xg01, xg2 = xg02, yg1 = yg01, yg2 = yg02;
 679
 680         if(xg01>xg02){
 681             xg1 = xg02;
 682             xg2 = xg01;
 683         }
 684         if(yg01>yg02){
 685             yg1 = yg02;
 686             yg2 = yg01;
 687         }
 688
 689         if(x>=xg1-tolerance && x<=xg2+tolerance && y>=yg1-tolerance && y<=yg2+tolerance){ // takes into account errors in extrapolation
 690             if(y<yg1) currDist = yg1-y;
 691             else if(y>yg2) currDist = y-yg2;
 692             if(currDist<minDist) {
 693                 resultingDetElemId = detElemId;
 694                 minDist=currDist;
 695                 continue;
 696             }
 697             resultingDetElemId = detElemId;
 698             break;
 699         }
 700     } // loop on detElemId
 701     return resultingDetElemId;
 702 }
 703
 704
 705 //_____________________________________________________________________________
 706 void AliMUONTrackHitPattern::LocalBoardFromPos(Float_t x, Float_t y,
 707                                                  Int_t detElemId, Int_t cathode,
 708                                                  Int_t localBoard[4]) const
 709 {
 710     //
 711     /// Given the (x,y) position in the chamber,
 712     /// it returns the corresponding local board
 713     //
 714
 715     for(Int_t loc=0; loc<fgkNlocations; loc++){
 716         localBoard[loc]=-1;
 717     }
 718     Float_t xl, yl, zl;
 719     fTransformer.Global2Local(detElemId, x, y, 0, xl, yl, zl);
 720     TVector2 pos(xl,yl);
 721     const AliMpVSegmentation* seg =
 722         AliMpSegmentation::Instance()
 723           ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
 724     if (seg){
 725         AliMpPad pad = seg->PadByPosition(pos,kFALSE);
 726         for (Int_t loc=0; loc<pad.GetNofLocations(); loc++){
 727             AliMpIntPair location = pad.GetLocation(loc);
 728             localBoard[loc] = location.GetFirst();
 729         }
 730     }
 731 }
 732
 733
 734 //_____________________________________________________________________________
 735 Bool_t AliMUONTrackHitPattern::PerformTrigTrackMatch(UShort_t &pattern,
 736                                                      AliMUONTriggerTrack *matchedTrigTrack,
 737                                                      AliMUONVDigitStore& digitStore) const
 738 {
 739   //
 740   /// It searches for matching digits around the trigger track.
 741   //
 742
 743   enum {kBending, kNonBending};
 744
 745   Int_t chOrder[fgkNchambers] = {0,2,1,3};
 746
 747   TArrayF zRealMatch(fgkNchambers);
 748   TArrayF correctFactor(fgkNcathodes);
 749
 750   Bool_t isMatch[fgkNcathodes];
 751   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 752     isMatch[cath] = kFALSE;
 753   }
 754
 755   TArrayF zMeanChamber(fgkNchambers);
 756   for(Int_t ch=0; ch<fgkNchambers; ch++){
 757     zMeanChamber[ch] = AliMUONConstants::DefaultChamberZ(10+ch);
 758   }
 759
 760   TArrayI digitPerTrack(fgkNcathodes);
 761
 762   Float_t trackIntersectCh[fgkNchambers][fgkNcathodes];
 763
 764   TArrayI triggeredDigits;
 765   triggeredDigits.Set(fgkNchambers);
 766   triggeredDigits.Reset(-1);
 767
 768   TArrayI trigScheme[fgkNcathodes];
 769   TArrayI slatThatTriggered[fgkNcathodes];
 770   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 771     trigScheme[cath].Set(fgkNchambers);
 772     slatThatTriggered[cath].Set(fgkNchambers);
 773   }
 774
 775   Int_t boardThatTriggered[fgkNchambers][fgkNcathodes][fgkNlocations];
 776   TArrayI nboard[fgkNcathodes];
 777   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 778     nboard[cath].Set(fgkNlocations);
 779   }
 780   Int_t ineffBoard[fgkNlocations];
 781   for(Int_t loc=0; loc<fgkNlocations; loc++){
 782     ineffBoard[loc] = -1;
 783   }
 784
 785   digitPerTrack.Reset();
 786   for(Int_t ch=0; ch<fgkNchambers; ch++){
 787     zRealMatch[ch] = zMeanChamber[ch];
 788     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 789       for(Int_t loc=0; loc<fgkNlocations; loc++){
 790         boardThatTriggered[ch][cath][loc]=-1;
 791       }
 792     }
 793   }
 794
 795   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 796     slatThatTriggered[cath].Reset(-1);
 797     trigScheme[cath].Reset();
 798   }
 799
 800   Bool_t isClearEvent = kTRUE;
 801
 802   //Float_t x11 = matchedTrigTrack->GetX11();// x position (info from non-bending plane)
 803   Float_t y11 = matchedTrigTrack->GetY11();// y position (info from bending plane)
 804   Float_t thetaX = matchedTrigTrack->GetThetax();
 805   Float_t thetaY = matchedTrigTrack->GetThetay();
 806
 807   for(Int_t ch=0; ch<fgkNchambers; ch++) { // chamber loop
 808     Int_t currCh = chOrder[ch];
 809     AliDebug(2, Form("zMeanChamber[%i] = %.2f\tzRealMatch[0] = %.2f\n",currCh,zMeanChamber[currCh],zRealMatch[0]));
 810
 811     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 812       correctFactor[cath]=1.;
 813     }
 814     // calculate corrections to trigger track theta
 815     if(ch>=1) correctFactor[kNonBending] = zMeanChamber[0]/zRealMatch[0];// corrects x position
 816     if(ch>=2) correctFactor[kBending] = (zMeanChamber[2] - zMeanChamber[0]) / (zRealMatch[2] - zRealMatch[0]);// corrects y position
 817
 818     // searching track intersection with chambers (first approximation)
 819     Float_t deltaZ = zMeanChamber[currCh] - zMeanChamber[0];
 820     trackIntersectCh[currCh][0] = zMeanChamber[currCh] * TMath::Tan(thetaX) * correctFactor[kNonBending];// x position (info from non-bending plane)
 821     trackIntersectCh[currCh][1] = y11 + deltaZ * TMath::Tan(thetaY) * correctFactor[kBending];// y position (info from bending plane)
 822     Int_t detElemIdFromTrack = DetElemIdFromPos(trackIntersectCh[currCh][0], trackIntersectCh[currCh][1], 11+currCh, 0);
 823     if(detElemIdFromTrack<0) {
 824       AliDebug(1, "Warning: trigger track outside trigger chamber\n");
 825       continue;
 826     }
 827
 828     triggeredDigits[currCh] = FindPadMatchingTrig(digitStore, detElemIdFromTrack, trackIntersectCh[currCh], isMatch, nboard, zRealMatch, y11);
 829
 830     // if FindPadMatchingTrig = -500 => too many digits matching pad =>
 831     //                               => Event not clear => Reject track
 832     if(triggeredDigits[currCh]<-100){
 833       isClearEvent = kFALSE;
 834       AliDebug(1, Form("Warning: track = %p (%i) matches many pads. Rejected!\n",(void *)matchedTrigTrack, detElemIdFromTrack));
 835       break;
 836     }
 837
 838     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 839       if(!isMatch[cath]) continue;
 840       SetBit(pattern, cath, currCh);
 841       digitPerTrack[cath]++;
 842       trigScheme[cath][currCh]++;
 843       slatThatTriggered[cath][currCh] = detElemIdFromTrack;
 844       for(Int_t loc=0; loc<fgkNlocations; loc++){
 845         boardThatTriggered[currCh][cath][loc] = nboard[cath][loc];
 846       }
 847     }
 848   } // end chamber loop
 849
 850   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 851     if(digitPerTrack[cath]<3) isClearEvent = kFALSE;
 852     if(!isClearEvent) AliDebug(1, Form("Warning: found %i digits for trigger track cathode %i.\nRejecting event\n", digitPerTrack[cath],cath));
 853   }
 854
 855   if(!isClearEvent) return kFALSE;
 856
 857   Int_t goodForEff = kBoardEff;
 858
 859   Int_t ineffSlat = -1;
 860   Int_t ineffDetElId = -1;
 861   Int_t firstSlat = slatThatTriggered[kBending][0]%100;
 862   if(firstSlat<0) firstSlat = slatThatTriggered[kBending][1]%100;
 863   Int_t firstBoard = boardThatTriggered[0][kBending][0];
 864   if(firstBoard<0) firstBoard = boardThatTriggered[1][kBending][0];
 865   for(Int_t ch=0; ch<fgkNchambers; ch++){
 866     Bool_t isCurrChIneff = kFALSE;
 867     Int_t currSlat = slatThatTriggered[kBending][ch]%100;
 868     if(currSlat<0){
 869       ineffDetElId = DetElemIdFromPos(trackIntersectCh[ch][0], trackIntersectCh[ch][1], 11+ch, kBending);
 870       currSlat = ineffDetElId%100;
 871       ineffSlat = currSlat;
 872       isCurrChIneff = kTRUE;
 873     }
 874     if(currSlat!=firstSlat) {
 875       AddEffInfo(pattern, 20, kChEff);
 876       return kTRUE;
 877     }
 878     Bool_t atLeastOneLoc=kFALSE;
 879     if(isCurrChIneff) LocalBoardFromPos(trackIntersectCh[ch][0], trackIntersectCh[ch][1], ineffDetElId, kBending, ineffBoard);
 880     for(Int_t loc=0; loc<fgkNlocations; loc++){
 881       Int_t currBoard = boardThatTriggered[ch][kBending][loc];
 882       if(isCurrChIneff) currBoard = ineffBoard[loc];
 883       if(currBoard==firstBoard){
 884         atLeastOneLoc=kTRUE;
 885         break;
 886       }
 887     }
 888     if(!atLeastOneLoc) goodForEff = kSlatEff;
 889   } // end chamber loop
 890
 891   AddEffInfo(pattern, firstSlat, goodForEff);
 892   return kTRUE;
 893 }