MUON/AliMUONTrackHitPattern.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /* $Id$ */
  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       fDeltaZ(0.0),
  94       fTrigCovariance(0x0),
  95       fkMaxDistance(99999.)
  96 {
  97     /// Default constructor
  98     InitMembers();
  99
 100     // Set magnetic field
 101     const AliMagF* kField = AliTracker::GetFieldMap();
 102     if (!kField) AliFatal("No field available");
 103     AliMUONTrackExtrap::SetField(kField);
 104 }
 105
 106
 107 //______________________________________________________________________________
 108 AliMUONTrackHitPattern::~AliMUONTrackHitPattern(void)
 109 {
 110   /// Destructor
 111   delete fTrigCovariance;
 112 }
 113
 114
 115 //______________________________________________________________________________
 116 void AliMUONTrackHitPattern::InitMembers()
 117 {
 118   //
 119   /// Initialize data members
 120   //
 121   fDeltaZ = TMath::Abs(AliMUONConstants::DefaultChamberZ(12) - AliMUONConstants::DefaultChamberZ(10));
 122
 123   const Double_t kTrigNonBendReso = AliMUONConstants::TriggerNonBendingReso();
 124   const Double_t kTrigBendReso = AliMUONConstants::TriggerBendingReso();
 125   const Double_t kTrigSlopeBendReso = 1.414 * AliMUONConstants::TriggerBendingReso()/fDeltaZ;
 126   const Double_t kTrigCovSlopeBend = - kTrigBendReso * kTrigBendReso / fDeltaZ;
 127
 128   // Covariance matrix 3x3 (X,Y,slopeY) for trigger tracks
 129   fTrigCovariance = new TMatrixD(3,3);
 130   fTrigCovariance->Zero();
 131   (*fTrigCovariance)(0,0) = kTrigNonBendReso * kTrigNonBendReso;
 132   (*fTrigCovariance)(1,1) = kTrigBendReso * kTrigBendReso;
 133   (*fTrigCovariance)(2,2) = kTrigSlopeBendReso * kTrigSlopeBendReso;
 134   (*fTrigCovariance)(1,2) = (*fTrigCovariance)(2,1) = kTrigCovSlopeBend;
 135 }
 136
 137
 138 //_____________________________________________________________________________
 139 void AliMUONTrackHitPattern::CheckConstants() const
 140 {
 141 /// Check consistence of redefined constants
 142
 143   assert(fgkNcathodes == AliMpConstants::NofCathodes());
 144   assert(fgkNchambers == AliMpConstants::NofTriggerChambers());
 145   assert(fgkNplanes == AliMpConstants::NofTriggerChambers() * fgkNcathodes);
 146 }
 147
 148
 149 //______________________________________________________________________________
 150 void AliMUONTrackHitPattern::ExecuteValidation(AliMUONVTrackStore& trackStore,
 151                                                const AliMUONVTriggerTrackStore& triggerTrackStore,
 152                                                const AliMUONVTriggerStore& triggerStore) const
 153 {
 154   //
 155   /// Main method:
 156   /// Loops on reco tracks, extrapolates them to trigger chambers
 157   /// and searches for matching trigger tracks and digits
 158   //
 159
 160   AliMUONDigitStoreV1 digitStore;
 161   TriggerDigits(triggerStore,digitStore);
 162
 163
 164   TIter itTrack(trackStore.CreateIterator());
 165   AliMUONTrack* track;
 166
 167   const Int_t kFirstTrigCh = AliMUONConstants::NTrackingCh();
 168
 169   while ( ( track = static_cast<AliMUONTrack*>(itTrack()) ) )
 170   {
 171     AliMUONTrackParam trackParam(*((AliMUONTrackParam*) (track->GetTrackParamAtCluster()->Last())));
 172
 173     ApplyMCSCorrections(trackParam);
 174     AliMUONTrackExtrap::ExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(kFirstTrigCh)); // extrap to 1st trigger chamber
 175
 176     AliMUONTriggerTrack *matchedTriggerTrack = MatchTriggerTrack(track, trackParam, triggerTrackStore, triggerStore);
 177
 178     UShort_t pattern = GetHitPattern(trackParam, matchedTriggerTrack, digitStore);
 179     track->SetHitsPatternInTrigCh(pattern);
 180   }
 181 }
 182
 183
 184 //______________________________________________________________________________
 185 AliMUONTriggerTrack *
 186 AliMUONTrackHitPattern::MatchTriggerTrack(AliMUONTrack* track,
 187                                           AliMUONTrackParam& trackParam,
 188                                           const AliMUONVTriggerTrackStore& triggerTrackStore,
 189                                           const AliMUONVTriggerStore& triggerStore) const
 190 {
 191   //
 192   /// Match track with trigger track
 193   //
 194
 195   Int_t matchTrigger = 0;
 196   Int_t loTrgNum(-1);
 197   Double_t distTriggerTrack[3], sigma2[3];
 198   Double_t chi2;
 199   Double_t chi2MatchTrigger = 0., minChi2MatchTrigger = 999.;
 200   Int_t doubleMatch = -1; // Check if track matches 2 trigger tracks
 201   Double_t doubleChi2 = -1.;
 202   AliMUONTriggerTrack* doubleTriggerTrack = 0x0;
 203   AliMUONTriggerTrack* matchedTriggerTrack = 0x0;
 204
 205   const TMatrixD& kParamCov = trackParam.GetCovariances();
 206
 207   Double_t xTrack = trackParam.GetNonBendingCoor();
 208   Double_t yTrack = trackParam.GetBendingCoor();
 209   Double_t ySlopeTrack = trackParam.GetBendingSlope();
 210
 211   // Covariance matrix 3x3 (X,Y,slopeY) for tracker tracks
 212   TMatrixD trackCov(3,3);
 213   trackCov.Zero();
 214   trackCov(0,0) = kParamCov(0,0);
 215   trackCov(1,1) = kParamCov(2,2);
 216   trackCov(2,2) = kParamCov(3,3);
 217   trackCov(1,2) = kParamCov(2,3);
 218   trackCov(2,1) = kParamCov(3,2);
 219
 220   TMatrixD sumCov(trackCov,TMatrixD::kPlus,*fTrigCovariance);
 221
 222   Bool_t isCovOK = kTRUE;
 223
 224   if (sumCov.Determinant() != 0) {
 225     sumCov.Invert();
 226   } else {
 227     AliWarning(" Determinant = 0");
 228     isCovOK = kFALSE;
 229     sigma2[0] = kParamCov(0,0);
 230     sigma2[1] = kParamCov(2,2);
 231     sigma2[2] = kParamCov(3,3);
 232     // sigma of distributions (trigger-track) X,Y,slopeY
 233     const Double_t kDistSigma[3]={AliMUONConstants::TriggerNonBendingReso(),
 234                                   AliMUONConstants::TriggerBendingReso(),
 235                                   1.414 * AliMUONConstants::TriggerBendingReso()/fDeltaZ};
 236     for (Int_t iVar = 0; iVar < 3; iVar++) sigma2[iVar] += kDistSigma[iVar] * kDistSigma[iVar];
 237   }
 238
 239   AliMUONTriggerTrack *triggerTrack;
 240   TIter itTriggerTrack(triggerTrackStore.CreateIterator());
 241   while ( ( triggerTrack = static_cast<AliMUONTriggerTrack*>(itTriggerTrack() ) ) )
 242   {
 243     distTriggerTrack[0] = triggerTrack->GetX11() - xTrack;
 244     distTriggerTrack[1] = triggerTrack->GetY11() - yTrack;
 245     distTriggerTrack[2] = TMath::Tan(triggerTrack->GetThetay()) - ySlopeTrack;
 246
 247     if(isCovOK){
 248       TMatrixD paramDiff(3,1);
 249       for(Int_t iVar = 0; iVar < 3; iVar++)
 250         paramDiff(iVar,0) = distTriggerTrack[iVar];
 251
 252       TMatrixD tmp(sumCov,TMatrixD::kMult,paramDiff);
 253       TMatrixD chi2M(paramDiff,TMatrixD::kTransposeMult,tmp);
 254       chi2 = chi2M(0,0);
 255     }
 256     else {
 257       chi2 = 0.;
 258       for (Int_t iVar = 0; iVar < 3; iVar++) chi2 += distTriggerTrack[iVar]*distTriggerTrack[iVar]/sigma2[iVar];
 259     }
 260
 261     chi2 /= 3.; // Normalized Chi2: 3 degrees of freedom (X,Y,slopeY)
 262     if (chi2 < AliMUONReconstructor::GetRecoParam()->GetMaxNormChi2MatchTrigger())
 263     {
 264       Bool_t isDoubleTrack = (TMath::Abs(chi2 - minChi2MatchTrigger)<1.);
 265       if (chi2 < minChi2MatchTrigger && chi2 < AliMUONReconstructor::GetRecoParam()->GetMaxNormChi2MatchTrigger())
 266       {
 267         if(isDoubleTrack)
 268         {
 269           doubleMatch = loTrgNum;
 270           doubleChi2 = chi2MatchTrigger;
 271           doubleTriggerTrack = matchedTriggerTrack;
 272         }
 273         minChi2MatchTrigger = chi2;
 274         chi2MatchTrigger = chi2;
 275         loTrgNum = triggerTrack->GetLoTrgNum();
 276         matchedTriggerTrack = triggerTrack;
 277         AliMUONLocalTrigger* locTrg = triggerStore.FindLocal(loTrgNum);
 278         matchTrigger = 1;
 279         if(locTrg->LoLpt()>0) matchTrigger = 2;
 280         if(locTrg->LoHpt()>0) matchTrigger = 3;
 281       }
 282       else if(isDoubleTrack)
 283       {
 284         doubleMatch = triggerTrack->GetLoTrgNum();
 285         doubleChi2 = chi2;
 286       }
 287     }
 288   }
 289   if(doubleMatch>=0)
 290   { // If two trigger tracks match, select the one passing more trigger cuts
 291     AliDebug(1, Form("Two candidates found: %i and %i",loTrgNum,doubleMatch));
 292     AliMUONLocalTrigger* locTrg1 = triggerStore.FindLocal(doubleMatch);
 293     if((locTrg1->LoLpt()>0 && matchTrigger<2) || (locTrg1->LoHpt() && matchTrigger<3))
 294     {
 295       if(locTrg1->LoHpt()>0) matchTrigger=3;
 296       else matchTrigger = 2;
 297       loTrgNum = doubleMatch;
 298       chi2MatchTrigger = doubleChi2;
 299       matchedTriggerTrack = doubleTriggerTrack;
 300     }
 301   }
 302
 303   track->SetMatchTrigger(matchTrigger);
 304   track->SetLoTrgNum(loTrgNum);
 305   track->SetChi2MatchTrigger(chi2MatchTrigger);
 306
 307   AliMUONLocalTrigger* locTrg = static_cast<AliMUONLocalTrigger*>(triggerStore.FindLocal(loTrgNum));
 308
 309   if (locTrg)
 310   {
 311     Int_t deviation = locTrg->GetDeviation();
 312     track->SetLocalTrigger(locTrg->LoCircuit(),
 313                            locTrg->LoStripX(),
 314                            locTrg->LoStripY(),
 315                            deviation,
 316                            locTrg->LoLpt(),
 317                            locTrg->LoHpt());
 318   }
 319
 320   return matchedTriggerTrack;
 321 }
 322
 323
 324 //______________________________________________________________________________
 325 UShort_t AliMUONTrackHitPattern::GetHitPattern(AliMUONTrackParam &trackParam,
 326                                                AliMUONTriggerTrack* matchedTriggerTrack,
 327                                                AliMUONVDigitStore& digitStore) const
 328 {
 329   //
 330   /// Get hit pattern on trigger chambers for the current track
 331   //
 332   UShort_t pattern = 0;
 333   Bool_t isMatch[2];
 334   const Int_t kNTrackingCh = AliMUONConstants::NTrackingCh();
 335
 336   Bool_t patternFromTrigTrack = kFALSE;
 337
 338
 339   // Calculate hit pattern from trigger track
 340   if(matchedTriggerTrack){
 341     patternFromTrigTrack = PerformTrigTrackMatch(pattern, matchedTriggerTrack, digitStore);
 342   }
 343
 344   if(patternFromTrigTrack) return pattern;
 345
 346
 347   // Calculate hit pattern from tracker track propagation
 348   // if hit pattern from trigger track failed
 349
 350   for(Int_t ch=0; ch<4; ++ch)
 351   {
 352     Int_t iChamber = kNTrackingCh+ch;
 353     AliMUONTrackExtrap::ExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(iChamber));
 354     FindPadMatchingTrack(digitStore, trackParam, isMatch, iChamber);
 355     for(Int_t cath=0; cath<2; ++cath)
 356     {
 357       if(isMatch[cath]) SetBit(pattern, cath, ch);
 358     }
 359   }
 360   return pattern;
 361 }
 362
 363
 364 //______________________________________________________________________________
 365 void AliMUONTrackHitPattern::SetBit(UShort_t& pattern, Int_t cathode, Int_t chamber) const
 366 {
 367   //
 368   /// Set hits pattern
 369   //
 370   const Int_t kMask[2][4]= {{0x80, 0x40, 0x20, 0x10},
 371                             {0x08, 0x04, 0x02, 0x01}};
 372   pattern |= kMask[cathode][chamber];
 373 }
 374
 375
 376 //______________________________________________________________________________
 377 void AliMUONTrackHitPattern::AddEffInfo(UShort_t& pattern, Int_t slat, Int_t effType) const
 378 {
 379   //
 380   /// Set info on efficiency calculation
 381   //
 382   pattern += effType << 8;
 383   pattern += slat << 10;
 384 }
 385
 386
 387 //______________________________________________________________________________
 388 void
 389 AliMUONTrackHitPattern::ApplyMCSCorrections(AliMUONTrackParam& trackParam) const
 390 {
 391   //
 392   /// Returns uncertainties on extrapolated position.
 393   /// Takes into account Branson plane corrections in the iron wall.
 394   //
 395
 396   const Float_t kZFilterOut = AliMUONConstants::MuonFilterZEnd();
 397   const Float_t kFilterThickness = TMath::Abs(kZFilterOut-AliMUONConstants::MuonFilterZBeg()); // cm
 398
 399   AliMUONTrackExtrap::ExtrapToZCov(&trackParam, kZFilterOut); // Extrap to muon filter end
 400   AliMUONTrackExtrap::AddMCSEffect(&trackParam, kFilterThickness, AliMUONConstants::MuonFilterX0()); // Add MCS effects
 401   return;
 402 }
 403
 404
 405 //______________________________________________________________________________
 406 Bool_t
 407 AliMUONTrackHitPattern::TriggerDigits(const AliMUONVTriggerStore& triggerStore,
 408                                       AliMUONVDigitStore& digitStore) const
 409 {
 410   //
 411   /// make (S)Digit for trigger
 412   //
 413
 414   digitStore.Clear();
 415
 416   AliMUONLocalTrigger* locTrg;
 417   TIter next(triggerStore.CreateLocalIterator());
 418
 419   while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) )
 420   {
 421     if (locTrg->IsNull()) continue;
 422
 423     TArrayS xyPattern[2];
 424     locTrg->GetXPattern(xyPattern[0]);
 425     locTrg->GetYPattern(xyPattern[1]);
 426
 427     // do we need this ? (Ch.F.)
 428 //     for(Int_t cath=0; cath<2; ++cath)
 429 //     {
 430 //       for(Int_t ch=0; ch<4; ++ch)
 431 //       {
 432 //         if(xyPattern[cath][ch]==0) continue;
 433 //       }
 434 //     }
 435
 436     Int_t nBoard = locTrg->LoCircuit();
 437     fDigitMaker.TriggerDigits(nBoard, xyPattern, digitStore);
 438   }
 439   return kTRUE;
 440 }
 441
 442
 443 //______________________________________________________________________________
 444 void
 445 AliMUONTrackHitPattern::FindPadMatchingTrack(AliMUONVDigitStore& digitStore,
 446                                              const AliMUONTrackParam& trackParam,
 447                                              Bool_t isMatch[2], Int_t iChamber) const
 448 {
 449     //
 450     /// Given the tracker track position, searches for matching digits.
 451     //
 452
 453     Float_t minMatchDist[2];
 454
 455     for(Int_t cath=0; cath<2; ++cath)
 456     {
 457       isMatch[cath]=kFALSE;
 458       minMatchDist[cath]=fkMaxDistance/10.;
 459     }
 460
 461     TIter next(digitStore.CreateIterator());
 462     AliMUONVDigit* mDigit;
 463
 464     while ( ( mDigit = static_cast<AliMUONVDigit*>(next()) ) )
 465     {
 466       Int_t currDetElemId = mDigit->DetElemId();
 467       Int_t currCh = AliMpDEManager::GetChamberId(currDetElemId);
 468       if(currCh!=iChamber) continue;
 469       Int_t cathode = mDigit->Cathode();
 470       Int_t ix = mDigit->PadX();
 471       Int_t iy = mDigit->PadY();
 472       Float_t xpad, ypad, zpad;
 473       const AliMpVSegmentation* seg = AliMpSegmentation::Instance()
 474         ->GetMpSegmentation(currDetElemId,AliMp::GetCathodType(cathode));
 475
 476       AliMpPad pad = seg->PadByIndices(AliMpIntPair(ix,iy),kTRUE);
 477       Float_t xlocal1 = pad.Position().X();
 478       Float_t ylocal1 = pad.Position().Y();
 479       Float_t dpx = pad.Dimensions().X();
 480       Float_t dpy = pad.Dimensions().Y();
 481       fTransformer.Local2Global(currDetElemId, xlocal1, ylocal1, 0, xpad, ypad, zpad);
 482       Float_t matchDist = MinDistanceFromPad(xpad, ypad, zpad, dpx, dpy, trackParam);
 483       if(matchDist>minMatchDist[cathode])continue;
 484       isMatch[cathode] = kTRUE;
 485       if(isMatch[0] && isMatch[1]) break;
 486       minMatchDist[cathode] = matchDist;
 487     }
 488 }
 489
 490
 491 //______________________________________________________________________________
 492 Float_t
 493 AliMUONTrackHitPattern::MinDistanceFromPad(Float_t xPad, Float_t yPad, Float_t zPad,
 494                                            Float_t dpx, Float_t dpy,
 495                                            const AliMUONTrackParam& trackParam) const
 496 {
 497     //
 498     /// Decides if the digit belongs to the tracker track.
 499     //
 500
 501     AliMUONTrackParam trackParamAtPadZ(trackParam);
 502     AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtPadZ, zPad);
 503
 504     Float_t xTrackAtPad = trackParamAtPadZ.GetNonBendingCoor();
 505     Float_t yTrackAtPad = trackParamAtPadZ.GetBendingCoor();
 506
 507     const Float_t kNSigma = AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTrigger();
 508
 509     const TMatrixD& kCovParam = trackParamAtPadZ.GetCovariances();
 510
 511     Float_t sigmaX = TMath::Sqrt(kCovParam(0,0));
 512     Float_t sigmaY = TMath::Sqrt(kCovParam(2,2));
 513
 514     Float_t maxDistX = kNSigma * sigmaX; // in cm
 515     Float_t maxDistY = kNSigma * sigmaY; // in cm
 516
 517     Float_t deltaX = TMath::Abs(xPad-xTrackAtPad)-dpx;
 518     Float_t deltaY = TMath::Abs(yPad-yTrackAtPad)-dpy;
 519
 520     Float_t matchDist = fkMaxDistance;
 521     if(deltaX<=maxDistX && deltaY<=maxDistY) matchDist = TMath::Max(deltaX, deltaY);
 522
 523     return matchDist;
 524 }
 525
 526
 527 //_____________________________________________________________________________
 528 Int_t AliMUONTrackHitPattern::FindPadMatchingTrig(AliMUONVDigitStore& digitStore, Int_t &detElemId,
 529                                                   Float_t coor[2], Bool_t isMatch[2],
 530                                                   TArrayI nboard[2], TArrayF &zRealMatch, Float_t y11) const
 531 {
 532     //
 533     /// Check slat and board number of digit matching trigger track
 534     //
 535
 536     enum {kBending, kNonBending};
 537
 538     Float_t minMatchDist[fgkNcathodes];
 539     Int_t padsInCheckArea[fgkNcathodes];
 540
 541     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 542         isMatch[cath] = kFALSE;
 543         minMatchDist[cath] = fkMaxDistance/10.;
 544         padsInCheckArea[cath] = 0;
 545     }
 546     Int_t iChamber = AliMpDEManager::GetChamberId(detElemId);
 547     Int_t ch = iChamber-10;
 548     Float_t oldDeltaZ = AliMUONConstants::DefaultChamberZ(iChamber) - AliMUONConstants::DefaultChamberZ(10);
 549     Float_t y = coor[1];
 550     Int_t iSlat = detElemId%100;
 551     Int_t trigDigitBendPlane = -1;
 552     Int_t foundDetElemId = detElemId;
 553     Float_t foundZmatch=999.;
 554     Float_t yCoorAtPadZ=999.;
 555
 556     TIter next(digitStore.CreateIterator());
 557     AliMUONVDigit* mDigit;
 558     Int_t idigit=0;
 559
 560     while ( ( mDigit = static_cast<AliMUONVDigit*>(next()) ) )
 561     {
 562         idigit++;
 563         Int_t currDetElemId = mDigit->DetElemId();
 564         Int_t currCh = AliMpDEManager::GetChamberId(currDetElemId);
 565         if(currCh!=iChamber) continue;
 566         Int_t currSlat = currDetElemId%100;
 567         Int_t slatDiff = TMath::Abs(currSlat-iSlat);
 568         if(slatDiff>1 && slatDiff<17) continue; // Check neighbour slats
 569         Int_t cathode = mDigit->Cathode();
 570         Int_t ix = mDigit->PadX();
 571         Int_t iy = mDigit->PadY();
 572         Float_t xpad, ypad, zpad;
 573         const AliMpVSegmentation* seg = AliMpSegmentation::Instance()
 574             ->GetMpSegmentation(currDetElemId,AliMp::GetCathodType(cathode));
 575
 576         AliMpPad pad = seg->PadByIndices(AliMpIntPair(ix,iy),kTRUE);
 577         Float_t xlocal1 = pad.Position().X();
 578         Float_t ylocal1 = pad.Position().Y();
 579         Float_t dpx = pad.Dimensions().X();
 580         Float_t dpy = pad.Dimensions().Y();
 581         fTransformer.Local2Global(currDetElemId, xlocal1, ylocal1, 0, xpad, ypad, zpad);
 582         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]));
 583         // searching track intersection with chambers (second approximation)
 584         if(ch%2==1){
 585             //if(iChamber%2==1){
 586             Float_t deltaZ = zpad - zRealMatch[0];
 587             y = (coor[1]-y11)*deltaZ/oldDeltaZ + y11;
 588             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));
 589         }
 590         Float_t matchDist = PadMatchTrack(xpad, ypad, dpx, dpy, coor[0], y);
 591         if(matchDist<fkMaxDistance/2.) padsInCheckArea[cathode]++;
 592         if(matchDist>minMatchDist[cathode])continue;
 593         isMatch[cathode] = kTRUE;
 594         minMatchDist[cathode] = matchDist;
 595         foundDetElemId = currDetElemId;
 596         foundZmatch=zpad;
 597         yCoorAtPadZ=y;
 598         if(cathode==kBending) trigDigitBendPlane = idigit;
 599         for (Int_t loc=0; loc<pad.GetNofLocations(); loc++){
 600             AliMpIntPair location = pad.GetLocation(loc);
 601             nboard[cathode][loc] = location.GetFirst();
 602         }
 603         for(Int_t loc=pad.GetNofLocations(); loc<fgkNlocations; loc++){
 604             nboard[cathode][loc]=-1;
 605         }
 606     }
 607
 608     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 609         if(padsInCheckArea[cath]>2) {
 610           AliDebug(1, Form("padsInCheckArea[%i] = %i\n",cath,padsInCheckArea[cath]));
 611             return -500;
 612         }
 613     }
 614
 615     if(isMatch[kBending] || isMatch[kNonBending]){
 616         detElemId = foundDetElemId;
 617         zRealMatch[ch] = foundZmatch;
 618         coor[1] = yCoorAtPadZ;
 619     }
 620     return trigDigitBendPlane;
 621 }
 622
 623 //_____________________________________________________________________________
 624 Float_t AliMUONTrackHitPattern::PadMatchTrack(Float_t xPad, Float_t yPad,
 625                                                 Float_t dpx, Float_t dpy,
 626                                                 Float_t xTrackAtPad, Float_t yTrackAtPad) const
 627 {
 628     //
 629     /// Decides if the digit belongs to the trigger track.
 630     //
 631
 632     Float_t maxDist = 2.;//3. // cm
 633     Float_t maxDistCheckArea = 6.; // cm
 634
 635     Float_t matchDist = fkMaxDistance;
 636
 637     Float_t deltaX = TMath::Abs(xPad-xTrackAtPad)-dpx;
 638     Float_t deltaY = TMath::Abs(yPad-yTrackAtPad)-dpy;
 639     Float_t maxDistX = maxDist;
 640     Float_t maxDistY = maxDist;
 641
 642     if(deltaX<=maxDistX && deltaY<=maxDistY) matchDist = TMath::Max(deltaX, deltaY);
 643     else if(deltaX<=maxDistCheckArea && deltaY<=maxDistCheckArea) matchDist = fkMaxDistance/5.;
 644     return matchDist;
 645 }
 646
 647
 648 //_____________________________________________________________________________
 649 Int_t AliMUONTrackHitPattern::DetElemIdFromPos(Float_t x, Float_t y,
 650                                                  Int_t chamber, Int_t cathode) const
 651 {
 652     //
 653     /// Given the (x,y) position in the chamber,
 654     /// it returns the corresponding slat
 655     //
 656
 657     Int_t resultingDetElemId = -1;
 658     AliMpDEIterator it;
 659     Float_t minDist = 999.;
 660     for ( it.First(chamber-1); ! it.IsDone(); it.Next() ){
 661         Int_t detElemId = it.CurrentDEId();
 662         Int_t ich = detElemId/100-10;
 663         Float_t tolerance=0.2*((Float_t)ich);
 664         Float_t currDist=9999.;
 665
 666         const AliMpVSegmentation* seg =
 667             AliMpSegmentation::Instance()
 668             ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
 669         if (!seg) continue;
 670
 671         Float_t deltax = seg->Dimensions().X();
 672         Float_t deltay = seg->Dimensions().Y();
 673         Float_t xlocal1 =  -deltax;
 674         Float_t ylocal1 =  -deltay;
 675         Float_t xlocal2 =  +deltax;
 676         Float_t ylocal2 =  +deltay;
 677         Float_t xg01, yg01, zg1, xg02, yg02, zg2;
 678         fTransformer.Local2Global(detElemId, xlocal1, ylocal1, 0, xg01, yg01, zg1);
 679         fTransformer.Local2Global(detElemId, xlocal2, ylocal2, 0, xg02, yg02, zg2);
 680
 681         Float_t xg1 = xg01, xg2 = xg02, yg1 = yg01, yg2 = yg02;
 682
 683         if(xg01>xg02){
 684             xg1 = xg02;
 685             xg2 = xg01;
 686         }
 687         if(yg01>yg02){
 688             yg1 = yg02;
 689             yg2 = yg01;
 690         }
 691
 692         if(x>=xg1-tolerance && x<=xg2+tolerance && y>=yg1-tolerance && y<=yg2+tolerance){ // takes into account errors in extrapolation
 693             if(y<yg1) currDist = yg1-y;
 694             else if(y>yg2) currDist = y-yg2;
 695             if(currDist<minDist) {
 696                 resultingDetElemId = detElemId;
 697                 minDist=currDist;
 698                 continue;
 699             }
 700             resultingDetElemId = detElemId;
 701             break;
 702         }
 703     } // loop on detElemId
 704     return resultingDetElemId;
 705 }
 706
 707
 708 //_____________________________________________________________________________
 709 void AliMUONTrackHitPattern::LocalBoardFromPos(Float_t x, Float_t y,
 710                                                  Int_t detElemId, Int_t cathode,
 711                                                  Int_t localBoard[4]) const
 712 {
 713     //
 714     /// Given the (x,y) position in the chamber,
 715     /// it returns the corresponding local board
 716     //
 717
 718     for(Int_t loc=0; loc<fgkNlocations; loc++){
 719         localBoard[loc]=-1;
 720     }
 721     Float_t xl, yl, zl;
 722     fTransformer.Global2Local(detElemId, x, y, 0, xl, yl, zl);
 723     TVector2 pos(xl,yl);
 724     const AliMpVSegmentation* seg =
 725         AliMpSegmentation::Instance()
 726           ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
 727     if (seg){
 728         AliMpPad pad = seg->PadByPosition(pos,kFALSE);
 729         for (Int_t loc=0; loc<pad.GetNofLocations(); loc++){
 730             AliMpIntPair location = pad.GetLocation(loc);
 731             localBoard[loc] = location.GetFirst();
 732         }
 733     }
 734 }
 735
 736
 737 //_____________________________________________________________________________
 738 Bool_t AliMUONTrackHitPattern::PerformTrigTrackMatch(UShort_t &pattern,
 739                                                      AliMUONTriggerTrack *matchedTrigTrack,
 740                                                      AliMUONVDigitStore& digitStore) const
 741 {
 742   //
 743   /// It searches for matching digits around the trigger track.
 744   //
 745
 746   enum {kBending, kNonBending};
 747
 748   Int_t chOrder[fgkNchambers] = {0,2,1,3};
 749
 750   TArrayF zRealMatch(fgkNchambers);
 751   TArrayF correctFactor(fgkNcathodes);
 752
 753   Bool_t isMatch[fgkNcathodes];
 754   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 755     isMatch[cath] = kFALSE;
 756   }
 757
 758   TArrayF zMeanChamber(fgkNchambers);
 759   for(Int_t ch=0; ch<fgkNchambers; ch++){
 760     zMeanChamber[ch] = AliMUONConstants::DefaultChamberZ(10+ch);
 761   }
 762
 763   TArrayI digitPerTrack(fgkNcathodes);
 764
 765   Float_t trackIntersectCh[fgkNchambers][fgkNcathodes];
 766
 767   TArrayI triggeredDigits;
 768   triggeredDigits.Set(fgkNchambers);
 769   triggeredDigits.Reset(-1);
 770
 771   TArrayI trigScheme[fgkNcathodes];
 772   TArrayI slatThatTriggered[fgkNcathodes];
 773   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 774     trigScheme[cath].Set(fgkNchambers);
 775     slatThatTriggered[cath].Set(fgkNchambers);
 776   }
 777
 778   Int_t boardThatTriggered[fgkNchambers][fgkNcathodes][fgkNlocations];
 779   TArrayI nboard[fgkNcathodes];
 780   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 781     nboard[cath].Set(fgkNlocations);
 782   }
 783   Int_t ineffBoard[fgkNlocations];
 784   for(Int_t loc=0; loc<fgkNlocations; loc++){
 785     ineffBoard[loc] = -1;
 786   }
 787
 788   digitPerTrack.Reset();
 789   for(Int_t ch=0; ch<fgkNchambers; ch++){
 790     zRealMatch[ch] = zMeanChamber[ch];
 791     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 792       for(Int_t loc=0; loc<fgkNlocations; loc++){
 793         boardThatTriggered[ch][cath][loc]=-1;
 794       }
 795     }
 796   }
 797
 798   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 799     slatThatTriggered[cath].Reset(-1);
 800     trigScheme[cath].Reset();
 801   }
 802
 803   Bool_t isClearEvent = kTRUE;
 804
 805   //Float_t x11 = matchedTrigTrack->GetX11();// x position (info from non-bending plane)
 806   Float_t y11 = matchedTrigTrack->GetY11();// y position (info from bending plane)
 807   Float_t thetaX = matchedTrigTrack->GetThetax();
 808   Float_t thetaY = matchedTrigTrack->GetThetay();
 809
 810   for(Int_t ch=0; ch<fgkNchambers; ch++) { // chamber loop
 811     Int_t currCh = chOrder[ch];
 812     AliDebug(2, Form("zMeanChamber[%i] = %.2f\tzRealMatch[0] = %.2f\n",currCh,zMeanChamber[currCh],zRealMatch[0]));
 813
 814     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 815       correctFactor[cath]=1.;
 816     }
 817     // calculate corrections to trigger track theta
 818     if(ch>=1) correctFactor[kNonBending] = zMeanChamber[0]/zRealMatch[0];// corrects x position
 819     if(ch>=2) correctFactor[kBending] = (zMeanChamber[2] - zMeanChamber[0]) / (zRealMatch[2] - zRealMatch[0]);// corrects y position
 820
 821     // searching track intersection with chambers (first approximation)
 822     Float_t deltaZ = zMeanChamber[currCh] - zMeanChamber[0];
 823     trackIntersectCh[currCh][0] = zMeanChamber[currCh] * TMath::Tan(thetaX) * correctFactor[kNonBending];// x position (info from non-bending plane)
 824     trackIntersectCh[currCh][1] = y11 + deltaZ * TMath::Tan(thetaY) * correctFactor[kBending];// y position (info from bending plane)
 825     Int_t detElemIdFromTrack = DetElemIdFromPos(trackIntersectCh[currCh][0], trackIntersectCh[currCh][1], 11+currCh, 0);
 826     if(detElemIdFromTrack<0) {
 827       AliDebug(1, "Warning: trigger track outside trigger chamber\n");
 828       continue;
 829     }
 830
 831     triggeredDigits[currCh] = FindPadMatchingTrig(digitStore, detElemIdFromTrack, trackIntersectCh[currCh], isMatch, nboard, zRealMatch, y11);
 832
 833     // if FindPadMatchingTrig = -500 => too many digits matching pad =>
 834     //                               => Event not clear => Reject track
 835     if(triggeredDigits[currCh]<-100){
 836       isClearEvent = kFALSE;
 837       AliDebug(1, Form("Warning: track = %p (%i) matches many pads. Rejected!\n",(void *)matchedTrigTrack, detElemIdFromTrack));
 838       break;
 839     }
 840
 841     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 842       if(!isMatch[cath]) continue;
 843       SetBit(pattern, cath, currCh);
 844       digitPerTrack[cath]++;
 845       trigScheme[cath][currCh]++;
 846       slatThatTriggered[cath][currCh] = detElemIdFromTrack;
 847       for(Int_t loc=0; loc<fgkNlocations; loc++){
 848         boardThatTriggered[currCh][cath][loc] = nboard[cath][loc];
 849       }
 850     }
 851   } // end chamber loop
 852
 853   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 854     if(digitPerTrack[cath]<3) isClearEvent = kFALSE;
 855     if(!isClearEvent) AliDebug(1, Form("Warning: found %i digits for trigger track cathode %i.\nRejecting event\n", digitPerTrack[cath],cath));
 856   }
 857
 858   if(!isClearEvent) return kFALSE;
 859
 860   Int_t goodForEff = kBoardEff;
 861
 862   Int_t ineffSlat = -1;
 863   Int_t ineffDetElId = -1;
 864   Int_t firstSlat = slatThatTriggered[kBending][0]%100;
 865   if(firstSlat<0) firstSlat = slatThatTriggered[kBending][1]%100;
 866   Int_t firstBoard = boardThatTriggered[0][kBending][0];
 867   if(firstBoard<0) firstBoard = boardThatTriggered[1][kBending][0];
 868   for(Int_t ch=0; ch<fgkNchambers; ch++){
 869     Bool_t isCurrChIneff = kFALSE;
 870     Int_t currSlat = slatThatTriggered[kBending][ch]%100;
 871     if(currSlat<0){
 872       ineffDetElId = DetElemIdFromPos(trackIntersectCh[ch][0], trackIntersectCh[ch][1], 11+ch, kBending);
 873       currSlat = ineffDetElId%100;
 874       ineffSlat = currSlat;
 875       isCurrChIneff = kTRUE;
 876     }
 877     if(currSlat!=firstSlat) {
 878       AddEffInfo(pattern, 20, kChEff);
 879       return kTRUE;
 880     }
 881     Bool_t atLeastOneLoc=kFALSE;
 882     if(isCurrChIneff) LocalBoardFromPos(trackIntersectCh[ch][0], trackIntersectCh[ch][1], ineffDetElId, kBending, ineffBoard);
 883     for(Int_t loc=0; loc<fgkNlocations; loc++){
 884       Int_t currBoard = boardThatTriggered[ch][kBending][loc];
 885       if(isCurrChIneff) currBoard = ineffBoard[loc];
 886       if(currBoard==firstBoard){
 887         atLeastOneLoc=kTRUE;
 888         break;
 889       }
 890     }
 891     if(!atLeastOneLoc) goodForEff = kSlatEff;
 892   } // end chamber loop
 893
 894   AddEffInfo(pattern, firstSlat, goodForEff);
 895   return kTRUE;
 896 }