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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  13  * provided "as is" without express or implied warranty.                  *
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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 fkMaxDistance(99999.)
  90 {
  91     /// Default constructor
  92     AliMUONTrackExtrap::SetField();
  93 }
  94
  95
  96 //______________________________________________________________________________
  97 AliMUONTrackHitPattern::~AliMUONTrackHitPattern(void)
  98 {
  99   /// Destructor
 100 }
 101
 102 //_____________________________________________________________________________
 103 void AliMUONTrackHitPattern::CheckConstants() const
 104 {
 105 /// Check consistence of redefined constants
 106
 107   assert(fgkNcathodes == AliMpConstants::NofCathodes());
 108   assert(fgkNchambers == AliMpConstants::NofTriggerChambers());
 109   assert(fgkNplanes == AliMpConstants::NofTriggerChambers() * fgkNcathodes);
 110 }
 111
 112
 113 //______________________________________________________________________________
 114 void AliMUONTrackHitPattern::ExecuteValidation(const AliMUONVTrackStore& trackStore,
 115                                                const AliMUONVTriggerTrackStore& triggerTrackStore,
 116                                                const AliMUONVTriggerStore& triggerStore) const
 117 {
 118   //
 119   /// Main method:
 120   /// Loops on reco tracks, extrapolates them to trigger chambers
 121   /// and searches for matching trigger tracks and digits
 122   //
 123
 124   AliMUONDigitStoreV1 digitStore;
 125   fkDigitMaker.TriggerToDigitsStore(triggerStore,digitStore);
 126
 127   // Get the hit pattern for all trigger tracks
 128   AliMUONTriggerTrack* triggerTrack;
 129   TIter itTriggerTrack(triggerTrackStore.CreateIterator());
 130   while ( ( triggerTrack = static_cast<AliMUONTriggerTrack*>(itTriggerTrack() ) ) ){
 131     UShort_t pattern = GetHitPattern(triggerTrack, digitStore);
 132     triggerTrack->SetHitsPatternInTrigCh(pattern);
 133     AliDebug(1, Form("Hit pattern: hits 0x%x  slat %2i  board %3i  effFlag %i",
 134                      pattern & 0xFF, AliESDMuonTrack::GetSlatOrInfo(pattern),
 135                      triggerTrack->GetLoTrgNum(), AliESDMuonTrack::GetEffFlag(pattern)));
 136   }
 137
 138   // Match tracker tracks with trigger tracks.
 139   TIter itTrack(trackStore.CreateIterator());
 140   AliMUONTrack* track;
 141
 142   const Int_t kFirstTrigCh = AliMUONConstants::NTrackingCh();
 143
 144   while ( ( track = static_cast<AliMUONTrack*>(itTrack()) ) )
 145   {
 146     AliMUONTrackParam trackParam(*((AliMUONTrackParam*) (track->GetTrackParamAtCluster()->Last())));
 147
 148     ApplyMCSCorrections(trackParam);
 149     AliMUONTrackExtrap::ExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(kFirstTrigCh)); // extrap to 1st trigger chamber
 150
 151     AliMUONTriggerTrack *matchedTriggerTrack = MatchTriggerTrack(track, trackParam, triggerTrackStore, triggerStore);
 152
 153     // Copy trigger tracks hit pattern if there is matching,
 154     // otherwise calculate the hit pattern directly from tracker track:
 155     // the obtained pattern is good for check, but not good for efficiency determination.
 156     UShort_t pattern = matchedTriggerTrack ?
 157       matchedTriggerTrack->GetHitsPatternInTrigCh() :
 158       GetHitPattern(&trackParam, digitStore);
 159
 160     track->SetHitsPatternInTrigCh(pattern);
 161   }
 162 }
 163
 164
 165 //______________________________________________________________________________
 166 AliMUONTriggerTrack *
 167 AliMUONTrackHitPattern::MatchTriggerTrack(AliMUONTrack* track,
 168                                           AliMUONTrackParam& trackParam,
 169                                           const AliMUONVTriggerTrackStore& triggerTrackStore,
 170                                           const AliMUONVTriggerStore& triggerStore) const
 171 {
 172   //
 173   /// Match track with trigger track
 174   //
 175
 176   Int_t matchTrigger = 0;
 177   Int_t loTrgNum(-1);
 178   TMatrixD paramDiff(3,1);
 179   Double_t chi2;
 180   Double_t chi2MatchTrigger = 0., minChi2MatchTrigger = 999.;
 181   Int_t doubleMatch = -1; // Check if track matches 2 trigger tracks
 182   Double_t doubleChi2 = -1.;
 183   AliMUONTriggerTrack* doubleTriggerTrack = 0x0;
 184   AliMUONTriggerTrack* matchedTriggerTrack = 0x0;
 185
 186
 187   // Covariance matrix 3x3 (X,Y,slopeY) for trigger tracks
 188   TMatrixD trackCov(3,3);
 189
 190   AliMUONTriggerTrack *triggerTrack;
 191   TIter itTriggerTrack(triggerTrackStore.CreateIterator());
 192   while ( ( triggerTrack = static_cast<AliMUONTriggerTrack*>(itTriggerTrack() ) ) )
 193   {
 194     AliMUONTrackExtrap::LinearExtrapToZCov(&trackParam, triggerTrack->GetZ11());
 195     const TMatrixD& kParamCov = trackParam.GetCovariances();
 196
 197     Double_t xTrack = trackParam.GetNonBendingCoor();
 198     Double_t yTrack = trackParam.GetBendingCoor();
 199     Double_t ySlopeTrack = trackParam.GetBendingSlope();
 200
 201     paramDiff(0,0) = triggerTrack->GetX11() - xTrack;
 202     paramDiff(1,0) = triggerTrack->GetY11() - yTrack;
 203     paramDiff(2,0) = triggerTrack->GetSlopeY() - ySlopeTrack;
 204
 205     // Covariance matrix 3x3 (X,Y,slopeY) for tracker tracks
 206     trackCov.Zero();
 207     trackCov(0,0) = kParamCov(0,0);
 208     trackCov(1,1) = kParamCov(2,2);
 209     trackCov(2,2) = kParamCov(3,3);
 210     trackCov(1,2) = kParamCov(2,3);
 211     trackCov(2,1) = kParamCov(3,2);
 212
 213     // Covariance matrix 3x3 (X,Y,slopeY) for trigger tracks
 214     TMatrixD trigCov(triggerTrack->GetCovariances());
 215
 216     TMatrixD sumCov(trackCov,TMatrixD::kPlus,trigCov);
 217     if (sumCov.Determinant() != 0) {
 218       sumCov.Invert();
 219
 220       TMatrixD tmp(sumCov,TMatrixD::kMult,paramDiff);
 221       TMatrixD chi2M(paramDiff,TMatrixD::kTransposeMult,tmp);
 222       chi2 = chi2M(0,0);
 223     } else {
 224       AliWarning(" Determinant = 0");
 225       Double_t sigma2 = 0.;
 226       chi2 = 0.;
 227       for (Int_t iVar = 0; iVar < 3; iVar++) {
 228         sigma2 = trackCov(iVar,iVar) + trigCov(iVar,iVar);
 229         chi2 += paramDiff(iVar,0) * paramDiff(iVar,0) / sigma2;
 230       }
 231     }
 232
 233     chi2 /= 3.; // Normalized Chi2: 3 degrees of freedom (X,Y,slopeY)
 234     if (chi2 < GetRecoParam()->GetMaxNormChi2MatchTrigger())
 235     {
 236       Bool_t isDoubleTrack = (TMath::Abs(chi2 - minChi2MatchTrigger)<1.);
 237       if (chi2 < minChi2MatchTrigger && chi2 < GetRecoParam()->GetMaxNormChi2MatchTrigger())
 238       {
 239         if(isDoubleTrack)
 240         {
 241           doubleMatch = loTrgNum;
 242           doubleChi2 = chi2MatchTrigger;
 243           doubleTriggerTrack = matchedTriggerTrack;
 244         }
 245         minChi2MatchTrigger = chi2;
 246         chi2MatchTrigger = chi2;
 247         loTrgNum = triggerTrack->GetLoTrgNum();
 248         matchedTriggerTrack = triggerTrack;
 249         AliMUONLocalTrigger* locTrg = triggerStore.FindLocal(loTrgNum);
 250         matchTrigger = 1;
 251         if(locTrg->LoLpt()>0) matchTrigger = 2;
 252         if(locTrg->LoHpt()>0) matchTrigger = 3;
 253       }
 254       else if(isDoubleTrack)
 255       {
 256         doubleMatch = triggerTrack->GetLoTrgNum();
 257         doubleChi2 = chi2;
 258       }
 259     }
 260   }
 261   if(doubleMatch>=0)
 262   { // If two trigger tracks match, select the one passing more trigger cuts
 263     AliDebug(1, Form("Two candidates found: %i and %i",loTrgNum,doubleMatch));
 264     AliMUONLocalTrigger* locTrg1 = triggerStore.FindLocal(doubleMatch);
 265     if((locTrg1->LoLpt()>0 && matchTrigger<2) || (locTrg1->LoHpt() && matchTrigger<3))
 266     {
 267       if(locTrg1->LoHpt()>0) matchTrigger=3;
 268       else matchTrigger = 2;
 269       loTrgNum = doubleMatch;
 270       chi2MatchTrigger = doubleChi2;
 271       matchedTriggerTrack = doubleTriggerTrack;
 272     }
 273   }
 274
 275   track->SetMatchTrigger(matchTrigger);
 276   track->SetChi2MatchTrigger(chi2MatchTrigger);
 277
 278   AliMUONLocalTrigger* locTrg = static_cast<AliMUONLocalTrigger*>(triggerStore.FindLocal(loTrgNum));
 279
 280   if (locTrg)
 281   {
 282     track->SetLocalTrigger(locTrg->LoCircuit(),
 283                            locTrg->LoStripX(),
 284                            locTrg->LoStripY(),
 285                            locTrg->GetDeviation(),
 286                            locTrg->LoLpt(),
 287                            locTrg->LoHpt(),
 288                            locTrg->GetTriggerWithoutChamber());
 289   }
 290
 291   return matchedTriggerTrack;
 292 }
 293
 294
 295 //______________________________________________________________________________
 296 UShort_t AliMUONTrackHitPattern::GetHitPattern(AliMUONTriggerTrack* matchedTriggerTrack,
 297                                                AliMUONVDigitStore& digitStore) const
 298 {
 299   //
 300   /// Get hit pattern on trigger chambers for the current trigger track
 301   //
 302   UShort_t pattern = 0;
 303   PerformTrigTrackMatch(pattern, matchedTriggerTrack, digitStore);
 304   return pattern;
 305 }
 306
 307
 308 //______________________________________________________________________________
 309 UShort_t AliMUONTrackHitPattern::GetHitPattern(AliMUONTrackParam* trackParam,
 310                                                AliMUONVDigitStore& digitStore) const
 311 {
 312   //
 313   /// Get hit pattern on trigger chambers for the current tracker track
 314   //
 315   UShort_t pattern = 0;
 316   Bool_t isMatch[2];
 317   const Int_t kNTrackingCh = AliMUONConstants::NTrackingCh();
 318
 319   for(Int_t ch=0; ch<4; ++ch)
 320   {
 321     Int_t iChamber = kNTrackingCh+ch;
 322     AliMUONTrackExtrap::ExtrapToZCov(trackParam, AliMUONConstants::DefaultChamberZ(iChamber));
 323     FindPadMatchingTrack(digitStore, *trackParam, isMatch, iChamber);
 324     for(Int_t cath=0; cath<2; ++cath)
 325     {
 326       if(isMatch[cath]) AliESDMuonTrack::SetFiredChamber(pattern, cath, ch);
 327     }
 328   }
 329
 330   // pattern obtained by propagation of tracker track
 331   // when it does not match the trigger.
 332   AliESDMuonTrack::AddEffInfo(pattern, AliESDMuonTrack::kTrackerTrackPattern);
 333
 334   return pattern;
 335 }
 336
 337 //______________________________________________________________________________
 338 void
 339 AliMUONTrackHitPattern::ApplyMCSCorrections(AliMUONTrackParam& trackParam) const
 340 {
 341   //
 342   /// Returns uncertainties on extrapolated position.
 343   /// Takes into account Branson plane corrections in the iron wall.
 344   //
 345
 346   const Float_t kZFilterOut = AliMUONConstants::MuonFilterZEnd();
 347   const Float_t kFilterThickness = kZFilterOut-AliMUONConstants::MuonFilterZBeg(); // cm
 348
 349   AliMUONTrackExtrap::ExtrapToZCov(&trackParam, kZFilterOut); // Extrap to muon filter end
 350   AliMUONTrackExtrap::AddMCSEffect(&trackParam, kFilterThickness, AliMUONConstants::MuonFilterX0()); // Add MCS effects
 351   return;
 352 }
 353
 354
 355 //______________________________________________________________________________
 356 void
 357 AliMUONTrackHitPattern::FindPadMatchingTrack(const AliMUONVDigitStore& digitStore,
 358                                              const AliMUONTrackParam& trackParam,
 359                                              Bool_t isMatch[2], Int_t iChamber) const
 360 {
 361     //
 362     /// Given the tracker track position, searches for matching digits.
 363     //
 364
 365     Float_t minMatchDist[2];
 366
 367     for(Int_t cath=0; cath<2; ++cath)
 368     {
 369       isMatch[cath]=kFALSE;
 370       minMatchDist[cath]=fkMaxDistance/10.;
 371     }
 372
 373     TIter next(digitStore.CreateIterator());
 374     AliMUONVDigit* mDigit;
 375
 376     while ( ( mDigit = static_cast<AliMUONVDigit*>(next()) ) )
 377     {
 378       Int_t currDetElemId = mDigit->DetElemId();
 379       Int_t currCh = AliMpDEManager::GetChamberId(currDetElemId);
 380       if(currCh!=iChamber) continue;
 381       Int_t cathode = mDigit->Cathode();
 382       Int_t ix = mDigit->PadX();
 383       Int_t iy = mDigit->PadY();
 384       Float_t xpad, ypad, zpad;
 385       const AliMpVSegmentation* seg = AliMpSegmentation::Instance()
 386         ->GetMpSegmentation(currDetElemId,AliMp::GetCathodType(cathode));
 387
 388       AliMpPad pad = seg->PadByIndices(ix,iy,kTRUE);
 389       Float_t xlocal1 = pad.GetPositionX();
 390       Float_t ylocal1 = pad.GetPositionY();
 391       Float_t dpx = pad.GetDimensionX();
 392       Float_t dpy = pad.GetDimensionY();
 393
 394       fkTransformer.Local2Global(currDetElemId, xlocal1, ylocal1, 0, xpad, ypad, zpad);
 395       Float_t matchDist = MinDistanceFromPad(xpad, ypad, zpad, dpx, dpy, trackParam);
 396       if(matchDist>minMatchDist[cathode])continue;
 397       isMatch[cathode] = kTRUE;
 398       if(isMatch[0] && isMatch[1]) break;
 399       minMatchDist[cathode] = matchDist;
 400     }
 401 }
 402
 403
 404 //______________________________________________________________________________
 405 Float_t
 406 AliMUONTrackHitPattern::MinDistanceFromPad(Float_t xPad, Float_t yPad, Float_t zPad,
 407                                            Float_t dpx, Float_t dpy,
 408                                            const AliMUONTrackParam& trackParam) const
 409 {
 410     //
 411     /// Decides if the digit belongs to the tracker track.
 412     //
 413
 414     AliMUONTrackParam trackParamAtPadZ(trackParam);
 415     AliMUONTrackExtrap::LinearExtrapToZCov(&trackParamAtPadZ, zPad);
 416
 417     Float_t xTrackAtPad = trackParamAtPadZ.GetNonBendingCoor();
 418     Float_t yTrackAtPad = trackParamAtPadZ.GetBendingCoor();
 419
 420     const Float_t kNSigma = GetRecoParam()->GetSigmaCutForTrigger();
 421
 422     const TMatrixD& kCovParam = trackParamAtPadZ.GetCovariances();
 423
 424     Float_t sigmaX = TMath::Sqrt(kCovParam(0,0));
 425     Float_t sigmaY = TMath::Sqrt(kCovParam(2,2));
 426
 427     Float_t maxDistX = kNSigma * sigmaX; // in cm
 428     Float_t maxDistY = kNSigma * sigmaY; // in cm
 429
 430     Float_t deltaX = TMath::Abs(xPad-xTrackAtPad)-dpx;
 431     Float_t deltaY = TMath::Abs(yPad-yTrackAtPad)-dpy;
 432
 433     Float_t matchDist = fkMaxDistance;
 434     if(deltaX<=maxDistX && deltaY<=maxDistY) matchDist = TMath::Max(deltaX, deltaY);
 435
 436     return matchDist;
 437 }
 438
 439
 440 //_____________________________________________________________________________
 441 Int_t AliMUONTrackHitPattern::FindPadMatchingTrig(const AliMUONVDigitStore& digitStore, Int_t &detElemId,
 442                                                   Float_t coor[2], Bool_t isMatch[2],
 443                                                   TArrayI nboard[2], TArrayF &zRealMatch, Float_t y11) const
 444 {
 445     //
 446     /// Check slat and board number of digit matching trigger track
 447     //
 448
 449     enum {kBending, kNonBending};
 450
 451     Float_t minMatchDist[fgkNcathodes];
 452     Int_t padsInCheckArea[fgkNcathodes];
 453
 454     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 455         isMatch[cath] = kFALSE;
 456         minMatchDist[cath] = fkMaxDistance/10.;
 457         padsInCheckArea[cath] = 0;
 458     }
 459     Int_t iChamber = AliMpDEManager::GetChamberId(detElemId);
 460     Int_t ch = iChamber-10;
 461     Float_t oldDeltaZ = AliMUONConstants::DefaultChamberZ(iChamber) - AliMUONConstants::DefaultChamberZ(10);
 462     Float_t y = coor[1];
 463     Int_t iSlat = detElemId%100;
 464     Int_t trigDigitBendPlane = -1;
 465     Int_t foundDetElemId = detElemId;
 466     Float_t foundZmatch=999.;
 467     Float_t yCoorAtPadZ=999.;
 468
 469     TIter next(digitStore.CreateIterator());
 470     AliMUONVDigit* mDigit;
 471     Int_t idigit=0;
 472
 473     while ( ( mDigit = static_cast<AliMUONVDigit*>(next()) ) )
 474     {
 475         idigit++;
 476         Int_t currDetElemId = mDigit->DetElemId();
 477         Int_t currCh = AliMpDEManager::GetChamberId(currDetElemId);
 478         if(currCh!=iChamber) continue;
 479         Int_t currSlat = currDetElemId%100;
 480         Int_t slatDiff = TMath::Abs(currSlat-iSlat);
 481         if(slatDiff>1 && slatDiff<17) continue; // Check neighbour slats
 482         Int_t cathode = mDigit->Cathode();
 483         Int_t ix = mDigit->PadX();
 484         Int_t iy = mDigit->PadY();
 485         Float_t xpad, ypad, zpad;
 486         const AliMpVSegmentation* seg = AliMpSegmentation::Instance()
 487             ->GetMpSegmentation(currDetElemId,AliMp::GetCathodType(cathode));
 488
 489         AliMpPad pad = seg->PadByIndices(ix,iy,kTRUE);
 490         Float_t xlocal1 = pad.GetPositionX();
 491         Float_t ylocal1 = pad.GetPositionY();
 492         Float_t dpx = pad.GetDimensionX();
 493         Float_t dpy = pad.GetDimensionY();
 494
 495         fkTransformer.Local2Global(currDetElemId, xlocal1, ylocal1, 0, xpad, ypad, zpad);
 496         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]));
 497         // searching track intersection with chambers (second approximation)
 498         if(ch%2==1){
 499             //if(iChamber%2==1){
 500             Float_t deltaZ = zpad - zRealMatch[0];
 501             y = (coor[1]-y11)*deltaZ/oldDeltaZ + y11;
 502             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));
 503         }
 504         Float_t matchDist = PadMatchTrack(xpad, ypad, dpx, dpy, coor[0], y);
 505         if(matchDist<fkMaxDistance/2.) padsInCheckArea[cathode]++;
 506         if(matchDist>minMatchDist[cathode])continue;
 507         isMatch[cathode] = kTRUE;
 508         minMatchDist[cathode] = matchDist;
 509         foundDetElemId = currDetElemId;
 510         foundZmatch=zpad;
 511         yCoorAtPadZ=y;
 512         if(cathode==kBending) trigDigitBendPlane = idigit;
 513         for (Int_t loc=0; loc<pad.GetNofLocations(); loc++){
 514             nboard[cathode][loc] = pad.GetLocalBoardId(loc);
 515         }
 516         for(Int_t loc=pad.GetNofLocations(); loc<fgkNlocations; loc++){
 517             nboard[cathode][loc]=-1;
 518         }
 519     }
 520
 521     if(isMatch[kBending] || isMatch[kNonBending]){
 522         detElemId = foundDetElemId;
 523         zRealMatch[ch] = foundZmatch;
 524         coor[1] = yCoorAtPadZ;
 525     }
 526
 527     // If track matches many pads, it is not good for effciency determination.
 528     // However we still want to calculate the hit pattern.
 529     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 530       if(padsInCheckArea[cath]>2) {
 531         AliDebug(1, Form("padsInCheckArea[%i] = %i\n",cath,padsInCheckArea[cath]));
 532         return -500;
 533       }
 534     }
 535
 536     return trigDigitBendPlane;
 537 }
 538
 539 //_____________________________________________________________________________
 540 Float_t AliMUONTrackHitPattern::PadMatchTrack(Float_t xPad, Float_t yPad,
 541                                                 Float_t dpx, Float_t dpy,
 542                                                 Float_t xTrackAtPad, Float_t yTrackAtPad) const
 543 {
 544     //
 545     /// Decides if the digit belongs to the trigger track.
 546     //
 547
 548   Float_t maxDist = GetRecoParam()->GetStripCutForTrigger() * 2. * TMath::Min(dpx,dpy); // cm
 549   if(maxDist<2.) maxDist = 2.;
 550   Float_t maxDistCheckArea = GetRecoParam()->GetMaxStripAreaForTrigger() * 2. *  TMath::Min(dpx,dpy); // cm
 551
 552     Float_t matchDist = fkMaxDistance;
 553
 554     Float_t deltaX = TMath::Abs(xPad-xTrackAtPad)-dpx;
 555     Float_t deltaY = TMath::Abs(yPad-yTrackAtPad)-dpy;
 556     Float_t maxDistX = maxDist;
 557     Float_t maxDistY = maxDist;
 558
 559     if(deltaX<=maxDistX && deltaY<=maxDistY) matchDist = TMath::Max(deltaX, deltaY);
 560     else if(deltaX<=maxDistCheckArea && deltaY<=maxDistCheckArea) matchDist = fkMaxDistance/5.;
 561     return matchDist;
 562 }
 563
 564
 565 //_____________________________________________________________________________
 566 Int_t AliMUONTrackHitPattern::DetElemIdFromPos(Float_t x, Float_t y,
 567                                                  Int_t chamber, Int_t cathode) const
 568 {
 569     //
 570     /// Given the (x,y) position in the chamber,
 571     /// it returns the corresponding slat
 572     //
 573
 574     Int_t resultingDetElemId = -1;
 575     AliMpDEIterator it;
 576     Float_t minDist = 999.;
 577     for ( it.First(chamber-1); ! it.IsDone(); it.Next() ){
 578         Int_t detElemId = it.CurrentDEId();
 579         Int_t ich = detElemId/100-10;
 580         Float_t tolerance=0.2*((Float_t)ich);
 581         Float_t currDist=9999.;
 582
 583         const AliMpVSegmentation* seg =
 584             AliMpSegmentation::Instance()
 585             ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
 586         if (!seg) continue;
 587
 588         Float_t deltax = seg->GetDimensionX();
 589         Float_t deltay = seg->GetDimensionY();
 590         Float_t xlocal1 =  -deltax;
 591         Float_t ylocal1 =  -deltay;
 592         Float_t xlocal2 =  +deltax;
 593         Float_t ylocal2 =  +deltay;
 594         Float_t xg01, yg01, zg1, xg02, yg02, zg2;
 595         fkTransformer.Local2Global(detElemId, xlocal1, ylocal1, 0, xg01, yg01, zg1);
 596         fkTransformer.Local2Global(detElemId, xlocal2, ylocal2, 0, xg02, yg02, zg2);
 597
 598         Float_t xg1 = xg01, xg2 = xg02, yg1 = yg01, yg2 = yg02;
 599
 600         if(xg01>xg02){
 601             xg1 = xg02;
 602             xg2 = xg01;
 603         }
 604         if(yg01>yg02){
 605             yg1 = yg02;
 606             yg2 = yg01;
 607         }
 608
 609         if(x>=xg1-tolerance && x<=xg2+tolerance && y>=yg1-tolerance && y<=yg2+tolerance){ // takes into account errors in extrapolation
 610             if(y<yg1) currDist = yg1-y;
 611             else if(y>yg2) currDist = y-yg2;
 612             if(currDist<minDist) {
 613                 resultingDetElemId = detElemId;
 614                 minDist=currDist;
 615                 continue;
 616             }
 617             resultingDetElemId = detElemId;
 618             break;
 619         }
 620     } // loop on detElemId
 621     return resultingDetElemId;
 622 }
 623
 624
 625 //_____________________________________________________________________________
 626 void AliMUONTrackHitPattern::LocalBoardFromPos(Float_t x, Float_t y,
 627                                                  Int_t detElemId, Int_t cathode,
 628                                                  Int_t localBoard[4]) const
 629 {
 630     //
 631     /// Given the (x,y) position in the chamber,
 632     /// it returns the corresponding local board
 633     //
 634
 635     for(Int_t loc=0; loc<fgkNlocations; loc++){
 636         localBoard[loc]=-1;
 637     }
 638     Float_t xl, yl, zl;
 639     fkTransformer.Global2Local(detElemId, x, y, 0, xl, yl, zl);
 640     TVector2 pos(xl,yl);
 641     const AliMpVSegmentation* seg =
 642         AliMpSegmentation::Instance()
 643           ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
 644     if (seg){
 645         AliMpPad pad = seg->PadByPosition(pos.X(),pos.Y(),kFALSE);
 646         for (Int_t loc=0; loc<pad.GetNofLocations(); loc++){
 647             localBoard[loc] = pad.GetLocalBoardId(loc);
 648         }
 649     }
 650 }
 651
 652
 653 //_____________________________________________________________________________
 654 Bool_t AliMUONTrackHitPattern::PerformTrigTrackMatch(UShort_t &pattern,
 655                                                      const AliMUONTriggerTrack* matchedTrigTrack,
 656                                                      AliMUONVDigitStore& digitStore) const
 657 {
 658   //
 659   /// It searches for matching digits around the trigger track.
 660   //
 661
 662   enum {kBending, kNonBending};
 663
 664   Int_t chOrder[fgkNchambers] = {0,2,1,3};
 665
 666   TArrayF zRealMatch(fgkNchambers);
 667
 668   Bool_t isMatch[fgkNcathodes];
 669   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 670     isMatch[cath] = kFALSE;
 671   }
 672
 673   TArrayF zMeanChamber(fgkNchambers);
 674   zMeanChamber[0] = matchedTrigTrack->GetZ11();
 675   zMeanChamber[1] = matchedTrigTrack->GetZ11() + AliMUONConstants::DefaultChamberZ(11) - AliMUONConstants::DefaultChamberZ(10);
 676   zMeanChamber[2] = matchedTrigTrack->GetZ21();
 677   zMeanChamber[3] = matchedTrigTrack->GetZ21() + AliMUONConstants::DefaultChamberZ(13) - AliMUONConstants::DefaultChamberZ(12);
 678
 679   TArrayI digitPerTrack(fgkNcathodes);
 680
 681   Float_t trackIntersectCh[fgkNchambers][fgkNcathodes];
 682
 683   TArrayI triggeredDigits;
 684   triggeredDigits.Set(fgkNchambers);
 685   triggeredDigits.Reset(-1);
 686
 687   TArrayI trigScheme[fgkNcathodes];
 688   TArrayI slatThatTriggered[fgkNcathodes];
 689   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 690     trigScheme[cath].Set(fgkNchambers);
 691     slatThatTriggered[cath].Set(fgkNchambers);
 692   }
 693
 694   Int_t boardThatTriggered[fgkNchambers][fgkNcathodes][fgkNlocations];
 695   TArrayI nboard[fgkNcathodes];
 696   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 697     nboard[cath].Set(fgkNlocations);
 698   }
 699   Int_t ineffBoard[fgkNlocations];
 700   for(Int_t loc=0; loc<fgkNlocations; loc++){
 701     ineffBoard[loc] = -1;
 702   }
 703
 704   digitPerTrack.Reset();
 705   for(Int_t ch=0; ch<fgkNchambers; ch++){
 706     zRealMatch[ch] = zMeanChamber[ch];
 707     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 708       for(Int_t loc=0; loc<fgkNlocations; loc++){
 709         boardThatTriggered[ch][cath][loc]=-1;
 710       }
 711     }
 712   }
 713
 714   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 715     slatThatTriggered[cath].Reset(-1);
 716     trigScheme[cath].Reset();
 717   }
 718
 719   Bool_t isClearEvent = kTRUE;
 720
 721   Float_t y11 = matchedTrigTrack->GetY11();// y position (info from bending plane)
 722   Float_t slopeX = matchedTrigTrack->GetSlopeX();
 723   Float_t slopeY = matchedTrigTrack->GetSlopeY();
 724
 725   for(Int_t ch=0; ch<fgkNchambers; ch++) { // chamber loop
 726     Int_t currCh = chOrder[ch];
 727     AliDebug(3, Form("zMeanChamber[%i] = %.2f\tzRealMatch[0] = %.2f\n",currCh,zMeanChamber[currCh],zRealMatch[0]));
 728
 729     // searching track intersection with chambers (first approximation)
 730     Float_t deltaZ = zMeanChamber[currCh] - zMeanChamber[0];
 731     trackIntersectCh[currCh][0] = zMeanChamber[currCh] * slopeX;
 732     trackIntersectCh[currCh][1] = y11 + deltaZ * slopeY;
 733     Int_t detElemIdFromTrack = DetElemIdFromPos(trackIntersectCh[currCh][0], trackIntersectCh[currCh][1], 11+currCh, 0);
 734     if(detElemIdFromTrack<0) {
 735       AliDebug(1, "Warning: trigger track outside trigger chamber\n");
 736       isClearEvent = kFALSE;
 737
 738       // track is rejected since the extrapolated track
 739       // does not match a slat (border effects)
 740       AliESDMuonTrack::AddEffInfo(pattern, AliESDMuonTrack::kTrackOutsideGeometry);
 741       continue;
 742     }
 743
 744     triggeredDigits[currCh] = FindPadMatchingTrig(digitStore, detElemIdFromTrack, trackIntersectCh[currCh], isMatch, nboard, zRealMatch, y11);
 745
 746     // if FindPadMatchingTrig = -500 => too many digits matching pad =>
 747     //                               => Event not clear => Do not use for efficiency calculation
 748     if(triggeredDigits[currCh]<-100){
 749       isClearEvent = kFALSE;
 750       // track is rejected since it matches many pads
 751       AliESDMuonTrack::AddEffInfo(pattern, AliESDMuonTrack::kTrackMatchesManyPads);
 752       AliDebug(1, Form("Warning: track = %p (%i) matches many pads. Rejected!\n",(void *)matchedTrigTrack, detElemIdFromTrack));
 753     }
 754
 755     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 756       if(!isMatch[cath]) continue;
 757       AliESDMuonTrack::SetFiredChamber(pattern, cath, currCh);
 758       digitPerTrack[cath]++;
 759       trigScheme[cath][currCh]++;
 760       slatThatTriggered[cath][currCh] = detElemIdFromTrack;
 761       for(Int_t loc=0; loc<fgkNlocations; loc++){
 762         boardThatTriggered[currCh][cath][loc] = nboard[cath][loc];
 763       }
 764     }
 765   } // end chamber loop
 766
 767   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 768     if(digitPerTrack[cath]<3) {
 769       isClearEvent = kFALSE;
 770       // track is rejected since the number of associated
 771       // digits found is less than 3.
 772       AliESDMuonTrack::AddEffInfo(pattern, AliESDMuonTrack::kTrackMatchesFewPads);
 773       AliDebug(1, Form("Warning: found %i digits for trigger track cathode %i.\nRejecting event\n", digitPerTrack[cath],cath));
 774     }
 775   }
 776
 777   if(!isClearEvent) return kFALSE;
 778
 779   AliESDMuonTrack::EAliTriggerChPatternFlag goodForEff = AliESDMuonTrack::kBoardEff;
 780
 781   Int_t ineffSlat = -1;
 782   Int_t ineffDetElId = -1;
 783   Int_t firstSlat = slatThatTriggered[kBending][0]%100;
 784   if(firstSlat<0) firstSlat = slatThatTriggered[kBending][1]%100;
 785   Int_t firstBoard = boardThatTriggered[0][kBending][0];
 786   if(firstBoard<0) firstBoard = boardThatTriggered[1][kBending][0];
 787   for(Int_t ch=0; ch<fgkNchambers; ch++){
 788     Bool_t isCurrChIneff = kFALSE;
 789     Int_t currSlat = slatThatTriggered[kBending][ch]%100;
 790     if(currSlat<0){
 791       ineffDetElId = DetElemIdFromPos(trackIntersectCh[ch][0], trackIntersectCh[ch][1], 11+ch, kBending);
 792       currSlat = ineffDetElId%100;
 793       ineffSlat = currSlat;
 794       isCurrChIneff = kTRUE;
 795     }
 796     if(currSlat!=firstSlat) {
 797       AliESDMuonTrack::AddEffInfo(pattern,
 798                                   AliESDMuonTrack::kCrossDifferentSlats,
 799                                   AliESDMuonTrack::kChEff); // track crosses different slats
 800       return kTRUE;
 801     }
 802     Bool_t atLeastOneLoc=kFALSE;
 803     if(isCurrChIneff) LocalBoardFromPos(trackIntersectCh[ch][0], trackIntersectCh[ch][1], ineffDetElId, kBending, ineffBoard);
 804     for(Int_t loc=0; loc<fgkNlocations; loc++){
 805       Int_t currBoard = boardThatTriggered[ch][kBending][loc];
 806       if(isCurrChIneff) currBoard = ineffBoard[loc];
 807       if(currBoard==firstBoard){
 808         atLeastOneLoc=kTRUE;
 809         break;
 810       }
 811     }
 812     if(!atLeastOneLoc) goodForEff = AliESDMuonTrack::kSlatEff;
 813   } // end chamber loop
 814
 815   AliESDMuonTrack::AddEffInfo(pattern, firstSlat, goodForEff);
 816   return kTRUE;
 817 }