MUON/AliMUONTrackHitPattern.cxx

   1 /**************************************************************************
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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 "AliMUONRecoParam.h"
  51 #include "AliMUONTrack.h"
  52 #include "AliMUONTrackExtrap.h"
  53 #include "AliMUONTrackParam.h"
  54 #include "AliMUONVTrackStore.h"
  55 #include "AliMUONVTriggerStore.h"
  56 #include "AliMpPad.h"
  57 #include "AliMpSegmentation.h"
  58 #include "AliMpVSegmentation.h"
  59 #include "AliMpDEManager.h"
  60 #include "AliMUONReconstructor.h"
  61 #include "AliMUONTriggerTrack.h"
  62 #include "AliMUONVTriggerTrackStore.h"
  63
  64 #include "AliMpConstants.h"
  65
  66 #include "AliLog.h"
  67 #include "AliTracker.h"
  68
  69 #include <Riostream.h>
  70 #include <TArrayS.h>
  71 #include <TClonesArray.h>
  72 #include <TMath.h>
  73 #include <TMatrixD.h>
  74 #include <TROOT.h>
  75 #include <TDirectory.h>
  76 #include <TFile.h>
  77 #include <TSystem.h>
  78
  79 #include <cassert>
  80
  81 /// \cond CLASSIMP
  82 ClassImp(AliMUONTrackHitPattern) // Class implementation in ROOT context
  83 /// \endcond
  84
  85
  86 //______________________________________________________________________________
  87 AliMUONTrackHitPattern::AliMUONTrackHitPattern(const AliMUONRecoParam* recoParam,
  88                                                const AliMUONGeometryTransformer& transformer,
  89                                                const AliMUONDigitMaker& digitMaker)
  90 : TObject(),
  91 fkRecoParam(recoParam),
  92 fkTransformer(transformer),
  93 fkDigitMaker(digitMaker),
  94 fDeltaZ(0.0),
  95 fTrigCovariance(0x0),
  96 fkMaxDistance(99999.)
  97 {
  98     /// Default constructor
  99     InitMembers();
 100     AliMUONTrackExtrap::SetField();
 101 }
 102
 103
 104 //______________________________________________________________________________
 105 AliMUONTrackHitPattern::~AliMUONTrackHitPattern(void)
 106 {
 107   /// Destructor
 108   delete fTrigCovariance;
 109 }
 110
 111
 112 //______________________________________________________________________________
 113 void AliMUONTrackHitPattern::InitMembers()
 114 {
 115   //
 116   /// Initialize data members
 117   //
 118   fDeltaZ = TMath::Abs(AliMUONConstants::DefaultChamberZ(12) - AliMUONConstants::DefaultChamberZ(10));
 119
 120   const Double_t kTrigNonBendReso = AliMUONConstants::TriggerNonBendingReso();
 121   const Double_t kTrigBendReso = AliMUONConstants::TriggerBendingReso();
 122   const Double_t kTrigSlopeBendReso = 1.414 * AliMUONConstants::TriggerBendingReso()/fDeltaZ;
 123   const Double_t kTrigCovSlopeBend = - kTrigBendReso * kTrigBendReso / fDeltaZ;
 124
 125   // Covariance matrix 3x3 (X,Y,slopeY) for trigger tracks
 126   fTrigCovariance = new TMatrixD(3,3);
 127   fTrigCovariance->Zero();
 128   (*fTrigCovariance)(0,0) = kTrigNonBendReso * kTrigNonBendReso;
 129   (*fTrigCovariance)(1,1) = kTrigBendReso * kTrigBendReso;
 130   (*fTrigCovariance)(2,2) = kTrigSlopeBendReso * kTrigSlopeBendReso;
 131   (*fTrigCovariance)(1,2) = (*fTrigCovariance)(2,1) = kTrigCovSlopeBend;
 132 }
 133
 134
 135 //_____________________________________________________________________________
 136 void AliMUONTrackHitPattern::CheckConstants() const
 137 {
 138 /// Check consistence of redefined constants
 139
 140   assert(fgkNcathodes == AliMpConstants::NofCathodes());
 141   assert(fgkNchambers == AliMpConstants::NofTriggerChambers());
 142   assert(fgkNplanes == AliMpConstants::NofTriggerChambers() * fgkNcathodes);
 143 }
 144
 145
 146 //______________________________________________________________________________
 147 void AliMUONTrackHitPattern::ExecuteValidation(const AliMUONVTrackStore& trackStore,
 148                                                const AliMUONVTriggerTrackStore& triggerTrackStore,
 149                                                const AliMUONVTriggerStore& triggerStore) const
 150 {
 151   //
 152   /// Main method:
 153   /// Loops on reco tracks, extrapolates them to trigger chambers
 154   /// and searches for matching trigger tracks and digits
 155   //
 156
 157   AliMUONDigitStoreV1 digitStore;
 158   TriggerDigits(triggerStore,digitStore);
 159
 160
 161   TIter itTrack(trackStore.CreateIterator());
 162   AliMUONTrack* track;
 163
 164   const Int_t kFirstTrigCh = AliMUONConstants::NTrackingCh();
 165
 166   while ( ( track = static_cast<AliMUONTrack*>(itTrack()) ) )
 167   {
 168     AliMUONTrackParam trackParam(*((AliMUONTrackParam*) (track->GetTrackParamAtCluster()->Last())));
 169
 170     ApplyMCSCorrections(trackParam);
 171     AliMUONTrackExtrap::ExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(kFirstTrigCh)); // extrap to 1st trigger chamber
 172
 173     AliMUONTriggerTrack *matchedTriggerTrack = MatchTriggerTrack(track, trackParam, triggerTrackStore, triggerStore);
 174
 175     UShort_t pattern = GetHitPattern(trackParam, matchedTriggerTrack, digitStore);
 176     track->SetHitsPatternInTrigCh(pattern);
 177   }
 178 }
 179
 180
 181 //______________________________________________________________________________
 182 AliMUONTriggerTrack *
 183 AliMUONTrackHitPattern::MatchTriggerTrack(AliMUONTrack* track,
 184                                           AliMUONTrackParam& trackParam,
 185                                           const AliMUONVTriggerTrackStore& triggerTrackStore,
 186                                           const AliMUONVTriggerStore& triggerStore) const
 187 {
 188   //
 189   /// Match track with trigger track
 190   //
 191
 192   Int_t matchTrigger = 0;
 193   Int_t loTrgNum(-1);
 194   Double_t distTriggerTrack[3], sigma2[3];
 195   Double_t chi2;
 196   Double_t chi2MatchTrigger = 0., minChi2MatchTrigger = 999.;
 197   Int_t doubleMatch = -1; // Check if track matches 2 trigger tracks
 198   Double_t doubleChi2 = -1.;
 199   AliMUONTriggerTrack* doubleTriggerTrack = 0x0;
 200   AliMUONTriggerTrack* matchedTriggerTrack = 0x0;
 201
 202   const TMatrixD& kParamCov = trackParam.GetCovariances();
 203
 204   Double_t xTrack = trackParam.GetNonBendingCoor();
 205   Double_t yTrack = trackParam.GetBendingCoor();
 206   Double_t ySlopeTrack = trackParam.GetBendingSlope();
 207
 208   // Covariance matrix 3x3 (X,Y,slopeY) for tracker tracks
 209   TMatrixD trackCov(3,3);
 210   trackCov.Zero();
 211   trackCov(0,0) = kParamCov(0,0);
 212   trackCov(1,1) = kParamCov(2,2);
 213   trackCov(2,2) = kParamCov(3,3);
 214   trackCov(1,2) = kParamCov(2,3);
 215   trackCov(2,1) = kParamCov(3,2);
 216
 217   TMatrixD sumCov(trackCov,TMatrixD::kPlus,*fTrigCovariance);
 218
 219   Bool_t isCovOK = kTRUE;
 220
 221   if (sumCov.Determinant() != 0) {
 222     sumCov.Invert();
 223   } else {
 224     AliWarning(" Determinant = 0");
 225     isCovOK = kFALSE;
 226     sigma2[0] = kParamCov(0,0);
 227     sigma2[1] = kParamCov(2,2);
 228     sigma2[2] = kParamCov(3,3);
 229     // sigma of distributions (trigger-track) X,Y,slopeY
 230     const Double_t kDistSigma[3]={AliMUONConstants::TriggerNonBendingReso(),
 231                                   AliMUONConstants::TriggerBendingReso(),
 232                                   1.414 * AliMUONConstants::TriggerBendingReso()/fDeltaZ};
 233     for (Int_t iVar = 0; iVar < 3; iVar++) sigma2[iVar] += kDistSigma[iVar] * kDistSigma[iVar];
 234   }
 235
 236   AliMUONTriggerTrack *triggerTrack;
 237   TIter itTriggerTrack(triggerTrackStore.CreateIterator());
 238   while ( ( triggerTrack = static_cast<AliMUONTriggerTrack*>(itTriggerTrack() ) ) )
 239   {
 240     distTriggerTrack[0] = triggerTrack->GetX11() - xTrack;
 241     distTriggerTrack[1] = triggerTrack->GetY11() - yTrack;
 242     distTriggerTrack[2] = TMath::Tan(triggerTrack->GetThetay()) - ySlopeTrack;
 243
 244     if(isCovOK){
 245       TMatrixD paramDiff(3,1);
 246       for(Int_t iVar = 0; iVar < 3; iVar++)
 247         paramDiff(iVar,0) = distTriggerTrack[iVar];
 248
 249       TMatrixD tmp(sumCov,TMatrixD::kMult,paramDiff);
 250       TMatrixD chi2M(paramDiff,TMatrixD::kTransposeMult,tmp);
 251       chi2 = chi2M(0,0);
 252     }
 253     else {
 254       chi2 = 0.;
 255       for (Int_t iVar = 0; iVar < 3; iVar++) chi2 += distTriggerTrack[iVar]*distTriggerTrack[iVar]/sigma2[iVar];
 256     }
 257
 258     chi2 /= 3.; // Normalized Chi2: 3 degrees of freedom (X,Y,slopeY)
 259     if (chi2 < GetRecoParam()->GetMaxNormChi2MatchTrigger())
 260     {
 261       Bool_t isDoubleTrack = (TMath::Abs(chi2 - minChi2MatchTrigger)<1.);
 262       if (chi2 < minChi2MatchTrigger && chi2 < GetRecoParam()->GetMaxNormChi2MatchTrigger())
 263       {
 264         if(isDoubleTrack)
 265         {
 266           doubleMatch = loTrgNum;
 267           doubleChi2 = chi2MatchTrigger;
 268           doubleTriggerTrack = matchedTriggerTrack;
 269         }
 270         minChi2MatchTrigger = chi2;
 271         chi2MatchTrigger = chi2;
 272         loTrgNum = triggerTrack->GetLoTrgNum();
 273         matchedTriggerTrack = triggerTrack;
 274         AliMUONLocalTrigger* locTrg = triggerStore.FindLocal(loTrgNum);
 275         matchTrigger = 1;
 276         if(locTrg->LoLpt()>0) matchTrigger = 2;
 277         if(locTrg->LoHpt()>0) matchTrigger = 3;
 278       }
 279       else if(isDoubleTrack)
 280       {
 281         doubleMatch = triggerTrack->GetLoTrgNum();
 282         doubleChi2 = chi2;
 283       }
 284     }
 285   }
 286   if(doubleMatch>=0)
 287   { // If two trigger tracks match, select the one passing more trigger cuts
 288     AliDebug(1, Form("Two candidates found: %i and %i",loTrgNum,doubleMatch));
 289     AliMUONLocalTrigger* locTrg1 = triggerStore.FindLocal(doubleMatch);
 290     if((locTrg1->LoLpt()>0 && matchTrigger<2) || (locTrg1->LoHpt() && matchTrigger<3))
 291     {
 292       if(locTrg1->LoHpt()>0) matchTrigger=3;
 293       else matchTrigger = 2;
 294       loTrgNum = doubleMatch;
 295       chi2MatchTrigger = doubleChi2;
 296       matchedTriggerTrack = doubleTriggerTrack;
 297     }
 298   }
 299
 300   track->SetMatchTrigger(matchTrigger);
 301   track->SetLoTrgNum(loTrgNum);
 302   track->SetChi2MatchTrigger(chi2MatchTrigger);
 303
 304   AliMUONLocalTrigger* locTrg = static_cast<AliMUONLocalTrigger*>(triggerStore.FindLocal(loTrgNum));
 305
 306   if (locTrg)
 307   {
 308     Int_t deviation = locTrg->GetDeviation();
 309     track->SetLocalTrigger(locTrg->LoCircuit(),
 310                            locTrg->LoStripX(),
 311                            locTrg->LoStripY(),
 312                            deviation,
 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     fkDigitMaker.TriggerDigits(nBoard, xyPattern, digitStore);
 435   }
 436   return kTRUE;
 437 }
 438
 439
 440 //______________________________________________________________________________
 441 void
 442 AliMUONTrackHitPattern::FindPadMatchingTrack(const 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       fkTransformer.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 = 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(const 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         fkTransformer.Local2Global(currDetElemId, xlocal1, ylocal1, 0, xpad, ypad, zpad);
 579         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]));
 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 = GetRecoParam()->GetStripCutForTrigger() * 2. * TMath::Min(dpx,dpy); // cm
 630   if(maxDist<2.) maxDist = 2.;
 631   Float_t maxDistCheckArea = GetRecoParam()->GetMaxStripAreaForTrigger() * 2. *  TMath::Min(dpx,dpy); // cm
 632
 633     Float_t matchDist = fkMaxDistance;
 634
 635     Float_t deltaX = TMath::Abs(xPad-xTrackAtPad)-dpx;
 636     Float_t deltaY = TMath::Abs(yPad-yTrackAtPad)-dpy;
 637     Float_t maxDistX = maxDist;
 638     Float_t maxDistY = maxDist;
 639
 640     if(deltaX<=maxDistX && deltaY<=maxDistY) matchDist = TMath::Max(deltaX, deltaY);
 641     else if(deltaX<=maxDistCheckArea && deltaY<=maxDistCheckArea) matchDist = fkMaxDistance/5.;
 642     return matchDist;
 643 }
 644
 645
 646 //_____________________________________________________________________________
 647 Int_t AliMUONTrackHitPattern::DetElemIdFromPos(Float_t x, Float_t y,
 648                                                  Int_t chamber, Int_t cathode) const
 649 {
 650     //
 651     /// Given the (x,y) position in the chamber,
 652     /// it returns the corresponding slat
 653     //
 654
 655     Int_t resultingDetElemId = -1;
 656     AliMpDEIterator it;
 657     Float_t minDist = 999.;
 658     for ( it.First(chamber-1); ! it.IsDone(); it.Next() ){
 659         Int_t detElemId = it.CurrentDEId();
 660         Int_t ich = detElemId/100-10;
 661         Float_t tolerance=0.2*((Float_t)ich);
 662         Float_t currDist=9999.;
 663
 664         const AliMpVSegmentation* seg =
 665             AliMpSegmentation::Instance()
 666             ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
 667         if (!seg) continue;
 668
 669         Float_t deltax = seg->Dimensions().X();
 670         Float_t deltay = seg->Dimensions().Y();
 671         Float_t xlocal1 =  -deltax;
 672         Float_t ylocal1 =  -deltay;
 673         Float_t xlocal2 =  +deltax;
 674         Float_t ylocal2 =  +deltay;
 675         Float_t xg01, yg01, zg1, xg02, yg02, zg2;
 676         fkTransformer.Local2Global(detElemId, xlocal1, ylocal1, 0, xg01, yg01, zg1);
 677         fkTransformer.Local2Global(detElemId, xlocal2, ylocal2, 0, xg02, yg02, zg2);
 678
 679         Float_t xg1 = xg01, xg2 = xg02, yg1 = yg01, yg2 = yg02;
 680
 681         if(xg01>xg02){
 682             xg1 = xg02;
 683             xg2 = xg01;
 684         }
 685         if(yg01>yg02){
 686             yg1 = yg02;
 687             yg2 = yg01;
 688         }
 689
 690         if(x>=xg1-tolerance && x<=xg2+tolerance && y>=yg1-tolerance && y<=yg2+tolerance){ // takes into account errors in extrapolation
 691             if(y<yg1) currDist = yg1-y;
 692             else if(y>yg2) currDist = y-yg2;
 693             if(currDist<minDist) {
 694                 resultingDetElemId = detElemId;
 695                 minDist=currDist;
 696                 continue;
 697             }
 698             resultingDetElemId = detElemId;
 699             break;
 700         }
 701     } // loop on detElemId
 702     return resultingDetElemId;
 703 }
 704
 705
 706 //_____________________________________________________________________________
 707 void AliMUONTrackHitPattern::LocalBoardFromPos(Float_t x, Float_t y,
 708                                                  Int_t detElemId, Int_t cathode,
 709                                                  Int_t localBoard[4]) const
 710 {
 711     //
 712     /// Given the (x,y) position in the chamber,
 713     /// it returns the corresponding local board
 714     //
 715
 716     for(Int_t loc=0; loc<fgkNlocations; loc++){
 717         localBoard[loc]=-1;
 718     }
 719     Float_t xl, yl, zl;
 720     fkTransformer.Global2Local(detElemId, x, y, 0, xl, yl, zl);
 721     TVector2 pos(xl,yl);
 722     const AliMpVSegmentation* seg =
 723         AliMpSegmentation::Instance()
 724           ->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
 725     if (seg){
 726         AliMpPad pad = seg->PadByPosition(pos,kFALSE);
 727         for (Int_t loc=0; loc<pad.GetNofLocations(); loc++){
 728             AliMpIntPair location = pad.GetLocation(loc);
 729             localBoard[loc] = location.GetFirst();
 730         }
 731     }
 732 }
 733
 734
 735 //_____________________________________________________________________________
 736 Bool_t AliMUONTrackHitPattern::PerformTrigTrackMatch(UShort_t &pattern,
 737                                                      const AliMUONTriggerTrack* matchedTrigTrack,
 738                                                      AliMUONVDigitStore& digitStore) const
 739 {
 740   //
 741   /// It searches for matching digits around the trigger track.
 742   //
 743
 744   enum {kBending, kNonBending};
 745
 746   Int_t chOrder[fgkNchambers] = {0,2,1,3};
 747
 748   TArrayF zRealMatch(fgkNchambers);
 749   TArrayF correctFactor(fgkNcathodes);
 750
 751   Bool_t isMatch[fgkNcathodes];
 752   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 753     isMatch[cath] = kFALSE;
 754   }
 755
 756   TArrayF zMeanChamber(fgkNchambers);
 757   for(Int_t ch=0; ch<fgkNchambers; ch++){
 758     zMeanChamber[ch] = AliMUONConstants::DefaultChamberZ(10+ch);
 759   }
 760
 761   TArrayI digitPerTrack(fgkNcathodes);
 762
 763   Float_t trackIntersectCh[fgkNchambers][fgkNcathodes];
 764
 765   TArrayI triggeredDigits;
 766   triggeredDigits.Set(fgkNchambers);
 767   triggeredDigits.Reset(-1);
 768
 769   TArrayI trigScheme[fgkNcathodes];
 770   TArrayI slatThatTriggered[fgkNcathodes];
 771   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 772     trigScheme[cath].Set(fgkNchambers);
 773     slatThatTriggered[cath].Set(fgkNchambers);
 774   }
 775
 776   Int_t boardThatTriggered[fgkNchambers][fgkNcathodes][fgkNlocations];
 777   TArrayI nboard[fgkNcathodes];
 778   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 779     nboard[cath].Set(fgkNlocations);
 780   }
 781   Int_t ineffBoard[fgkNlocations];
 782   for(Int_t loc=0; loc<fgkNlocations; loc++){
 783     ineffBoard[loc] = -1;
 784   }
 785
 786   digitPerTrack.Reset();
 787   for(Int_t ch=0; ch<fgkNchambers; ch++){
 788     zRealMatch[ch] = zMeanChamber[ch];
 789     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 790       for(Int_t loc=0; loc<fgkNlocations; loc++){
 791         boardThatTriggered[ch][cath][loc]=-1;
 792       }
 793     }
 794   }
 795
 796   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 797     slatThatTriggered[cath].Reset(-1);
 798     trigScheme[cath].Reset();
 799   }
 800
 801   Bool_t isClearEvent = kTRUE;
 802
 803   //Float_t x11 = matchedTrigTrack->GetX11();// x position (info from non-bending plane)
 804   Float_t y11 = matchedTrigTrack->GetY11();// y position (info from bending plane)
 805   Float_t thetaX = matchedTrigTrack->GetThetax();
 806   Float_t thetaY = matchedTrigTrack->GetThetay();
 807
 808   for(Int_t ch=0; ch<fgkNchambers; ch++) { // chamber loop
 809     Int_t currCh = chOrder[ch];
 810     AliDebug(3, Form("zMeanChamber[%i] = %.2f\tzRealMatch[0] = %.2f\n",currCh,zMeanChamber[currCh],zRealMatch[0]));
 811
 812     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 813       correctFactor[cath]=1.;
 814     }
 815     // calculate corrections to trigger track theta
 816     if(ch>=1) correctFactor[kNonBending] = zMeanChamber[0]/zRealMatch[0];// corrects x position
 817     if(ch>=2) correctFactor[kBending] = (zMeanChamber[2] - zMeanChamber[0]) / (zRealMatch[2] - zRealMatch[0]);// corrects y position
 818
 819     // searching track intersection with chambers (first approximation)
 820     Float_t deltaZ = zMeanChamber[currCh] - zMeanChamber[0];
 821     trackIntersectCh[currCh][0] = zMeanChamber[currCh] * TMath::Tan(thetaX) * correctFactor[kNonBending];// x position (info from non-bending plane)
 822     trackIntersectCh[currCh][1] = y11 + deltaZ * TMath::Tan(thetaY) * correctFactor[kBending];// y position (info from bending plane)
 823     Int_t detElemIdFromTrack = DetElemIdFromPos(trackIntersectCh[currCh][0], trackIntersectCh[currCh][1], 11+currCh, 0);
 824     if(detElemIdFromTrack<0) {
 825       AliDebug(1, "Warning: trigger track outside trigger chamber\n");
 826       continue;
 827     }
 828
 829     triggeredDigits[currCh] = FindPadMatchingTrig(digitStore, detElemIdFromTrack, trackIntersectCh[currCh], isMatch, nboard, zRealMatch, y11);
 830
 831     // if FindPadMatchingTrig = -500 => too many digits matching pad =>
 832     //                               => Event not clear => Reject track
 833     if(triggeredDigits[currCh]<-100){
 834       isClearEvent = kFALSE;
 835       AliDebug(1, Form("Warning: track = %p (%i) matches many pads. Rejected!\n",(void *)matchedTrigTrack, detElemIdFromTrack));
 836       break;
 837     }
 838
 839     for(Int_t cath=0; cath<fgkNcathodes; cath++){
 840       if(!isMatch[cath]) continue;
 841       SetBit(pattern, cath, currCh);
 842       digitPerTrack[cath]++;
 843       trigScheme[cath][currCh]++;
 844       slatThatTriggered[cath][currCh] = detElemIdFromTrack;
 845       for(Int_t loc=0; loc<fgkNlocations; loc++){
 846         boardThatTriggered[currCh][cath][loc] = nboard[cath][loc];
 847       }
 848     }
 849   } // end chamber loop
 850
 851   for(Int_t cath=0; cath<fgkNcathodes; cath++){
 852     if(digitPerTrack[cath]<3) isClearEvent = kFALSE;
 853     if(!isClearEvent) AliDebug(1, Form("Warning: found %i digits for trigger track cathode %i.\nRejecting event\n", digitPerTrack[cath],cath));
 854   }
 855
 856   if(!isClearEvent) return kFALSE;
 857
 858   Int_t goodForEff = kBoardEff;
 859
 860   Int_t ineffSlat = -1;
 861   Int_t ineffDetElId = -1;
 862   Int_t firstSlat = slatThatTriggered[kBending][0]%100;
 863   if(firstSlat<0) firstSlat = slatThatTriggered[kBending][1]%100;
 864   Int_t firstBoard = boardThatTriggered[0][kBending][0];
 865   if(firstBoard<0) firstBoard = boardThatTriggered[1][kBending][0];
 866   for(Int_t ch=0; ch<fgkNchambers; ch++){
 867     Bool_t isCurrChIneff = kFALSE;
 868     Int_t currSlat = slatThatTriggered[kBending][ch]%100;
 869     if(currSlat<0){
 870       ineffDetElId = DetElemIdFromPos(trackIntersectCh[ch][0], trackIntersectCh[ch][1], 11+ch, kBending);
 871       currSlat = ineffDetElId%100;
 872       ineffSlat = currSlat;
 873       isCurrChIneff = kTRUE;
 874     }
 875     if(currSlat!=firstSlat) {
 876       AddEffInfo(pattern, 20, kChEff);
 877       return kTRUE;
 878     }
 879     Bool_t atLeastOneLoc=kFALSE;
 880     if(isCurrChIneff) LocalBoardFromPos(trackIntersectCh[ch][0], trackIntersectCh[ch][1], ineffDetElId, kBending, ineffBoard);
 881     for(Int_t loc=0; loc<fgkNlocations; loc++){
 882       Int_t currBoard = boardThatTriggered[ch][kBending][loc];
 883       if(isCurrChIneff) currBoard = ineffBoard[loc];
 884       if(currBoard==firstBoard){
 885         atLeastOneLoc=kTRUE;
 886         break;
 887       }
 888     }
 889     if(!atLeastOneLoc) goodForEff = kSlatEff;
 890   } // end chamber loop
 891
 892   AddEffInfo(pattern, firstSlat, goodForEff);
 893   return kTRUE;
 894 }