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File indexing completed on 2024-04-06 12:21:04 

0001 #include "L1Trigger/L1TMuonOverlap/interface/AngleConverter.h"
0002 #include "L1Trigger/L1TMuonOverlap/interface/OMTFConfiguration.h"
0003 
0004 #include "FWCore/Framework/interface/ConsumesCollector.h"
0005 #include "FWCore/Framework/interface/EventSetup.h"
0006 #include "FWCore/Utilities/interface/Transition.h"
0007 
0008 #include "L1Trigger/CSCTriggerPrimitives/interface/CSCPatternBank.h"
0009 
0010 #include "L1Trigger/DTUtilities/interface/DTTrigGeom.h"
0011 
0012 #include "DataFormats/CSCDigi/interface/CSCConstants.h"
0013 #include "DataFormats/CSCDigi/interface/CSCCorrelatedLCTDigi.h"
0014 #include "DataFormats/L1DTTrackFinder/interface/L1MuDTChambPhDigi.h"
0015 #include "DataFormats/L1DTTrackFinder/interface/L1MuDTChambThContainer.h"
0016 #include "DataFormats/RPCDigi/interface/RPCDigi.h"
0017 
0018 #include <cmath>
0019 #include <array>
0020 
0021 namespace {
0022   template <typename T>
0023   int sgn(T val) {
0024     return (T(0) < val) - (val < T(0));
0025   }
0026 
0027   constexpr std::array<float, 8> bounds = {{1.24, 1.14353, 1.09844, 1.05168, 1.00313, 0.952728, 0.90037, 0.8}};
0028   //   0.8       -> 73

0029   //   0.85      -> 78

0030   //   0.9265    -> 85

0031   //   0.9779    -> 89.9 -> 90

0032   //   1.0274    -> 94.4 -> 94

0033   //   1.07506   -> 98.9 -> 99

0034   //   1.121     -> 103

0035   //   1.2       -> 110

0036   //   1.25      -> 115

0037   //

0038   // other (1.033) -> 1.033 -> 95

0039 
0040   int etaVal2Bit(float eta) { return bounds.rend() - std::lower_bound(bounds.rbegin(), bounds.rend(), fabs(eta)); }
0041 
0042   int etaBit2Code(unsigned int bit) {
0043     int code = 73;
0044     switch (bit) {
0045       case 0: {
0046         code = 115;
0047         break;
0048       }
0049       case 1: {
0050         code = 110;
0051         break;
0052       }
0053       case 2: {
0054         code = 103;
0055         break;
0056       }
0057       case 3: {
0058         code = 99;
0059         break;
0060       }
0061       case 4: {
0062         code = 94;
0063         break;
0064       }
0065       case 5: {
0066         code = 90;
0067         break;
0068       }
0069       case 6: {
0070         code = 85;
0071         break;
0072       }
0073       case 7: {
0074         code = 78;
0075         break;
0076       }
0077       case 8: {
0078         code = 73;
0079         break;
0080       }
0081       default: {
0082         code = 95;
0083         break;
0084       }
0085     }
0086     return code;
0087   }
0088 
0089   int etaVal2Code(double etaVal) {
0090     int sign = sgn(etaVal);
0091     int bit = etaVal2Bit(fabs(etaVal));
0092     int code = etaBit2Code(bit);
0093     return sign * code;
0094   }
0095 
0096   int etaKeyWG2Code(const CSCDetId &detId, uint16_t keyWG) {
0097     signed int etaCode = 121;
0098     if (detId.station() == 1 && detId.ring() == 2) {
0099       if (keyWG < 49)
0100         etaCode = 121;
0101       else if (keyWG <= 57)
0102         etaCode = etaBit2Code(0);
0103       else if (keyWG <= 63)
0104         etaCode = etaBit2Code(1);
0105     } else if (detId.station() == 1 && detId.ring() == 3) {
0106       if (keyWG <= 2)
0107         etaCode = etaBit2Code(2);
0108       else if (keyWG <= 8)
0109         etaCode = etaBit2Code(3);
0110       else if (keyWG <= 15)
0111         etaCode = etaBit2Code(4);
0112       else if (keyWG <= 23)
0113         etaCode = etaBit2Code(5);
0114       else if (keyWG <= 31)
0115         etaCode = etaBit2Code(6);
0116     } else if ((detId.station() == 2 || detId.station() == 3) && detId.ring() == 2) {
0117       if (keyWG < 24)
0118         etaCode = 121;
0119       else if (keyWG <= 29)
0120         etaCode = etaBit2Code(0);
0121       else if (keyWG <= 43)
0122         etaCode = etaBit2Code(1);
0123       else if (keyWG <= 49)
0124         etaCode = etaBit2Code(2);
0125       else if (keyWG <= 56)
0126         etaCode = etaBit2Code(3);
0127       else if (keyWG <= 63)
0128         etaCode = etaBit2Code(4);
0129     }
0130 
0131     if (detId.endcap() == 2)
0132       etaCode *= -1;
0133     return etaCode;
0134   }
0135 
0136   int fixCscOffsetGeom(int offsetLoc) {
0137     // fix for CSC feo dependance from GlobalTag

0138 
0139     // dump of CSC offsets for MC global tag

0140     const std::vector<int> offCSC = {-154, -133, -17, -4,  4,   17,  133, 146, 154, 167, 283, 296, 304, 317,
0141                                      433,  446,  454, 467, 583, 596, 604, 617, 733, 746, 754, 767, 883, 904};
0142     auto gep = std::lower_bound(offCSC.begin(), offCSC.end(), offsetLoc);
0143     int fixOff = (gep != offCSC.end()) ? *gep : *(gep - 1);
0144     if (gep != offCSC.begin() && std::abs(*(gep - 1) - offsetLoc) < std::abs(fixOff - offsetLoc))
0145       fixOff = *(gep - 1);
0146     return fixOff;
0147   }
0148 
0149 }  // namespace

0150 
0151 AngleConverter::AngleConverter(edm::ConsumesCollector &iC, bool getDuringEvent) : _geom_cache_id(0ULL) {
0152   if (getDuringEvent) {
0153     rpcGeometryToken_ = iC.esConsumes<RPCGeometry, MuonGeometryRecord>();
0154     cscGeometryToken_ = iC.esConsumes<CSCGeometry, MuonGeometryRecord>();
0155     dtGeometryToken_ = iC.esConsumes<DTGeometry, MuonGeometryRecord>();
0156   } else {
0157     rpcGeometryToken_ = iC.esConsumes<RPCGeometry, MuonGeometryRecord, edm::Transition::BeginRun>();
0158     cscGeometryToken_ = iC.esConsumes<CSCGeometry, MuonGeometryRecord, edm::Transition::BeginRun>();
0159     dtGeometryToken_ = iC.esConsumes<DTGeometry, MuonGeometryRecord, edm::Transition::BeginRun>();
0160   }
0161 }
0162 ///////////////////////////////////////

0163 ///////////////////////////////////////

0164 AngleConverter::~AngleConverter() {}
0165 ///////////////////////////////////////

0166 ///////////////////////////////////////

0167 void AngleConverter::checkAndUpdateGeometry(const edm::EventSetup &es, unsigned int phiBins) {
0168   const MuonGeometryRecord &geom = es.get<MuonGeometryRecord>();
0169   unsigned long long geomid = geom.cacheIdentifier();
0170   if (_geom_cache_id != geomid) {
0171     _georpc = &geom.get(rpcGeometryToken_);
0172     _geocsc = &geom.get(cscGeometryToken_);
0173     _geodt = &geom.get(dtGeometryToken_);
0174     _geom_cache_id = geomid;
0175   }
0176 
0177   nPhiBins = phiBins;
0178 }
0179 ///////////////////////////////////////

0180 ///////////////////////////////////////

0181 int AngleConverter::getProcessorPhi(unsigned int iProcessor, l1t::tftype part, const L1MuDTChambPhDigi &digi) const {
0182   double hsPhiPitch = 2 * M_PI / nPhiBins;  // width of phi Pitch, related to halfStrip at CSC station 2

0183   const int dummy = nPhiBins;
0184   int processor = iProcessor + 1;                         // FIXME: get from OMTF name when available

0185   int posneg = (part == l1t::tftype::omtf_pos) ? 1 : -1;  // FIXME: get from OMTF name

0186 
0187   int sector =
0188       digi.scNum() + 1;  //NOTE: there is a inconsistency in DT sector numb. Thus +1 needed to get detector numb.

0189   int wheel = digi.whNum();
0190   int station = digi.stNum();
0191   int phiDT = digi.phi();
0192 
0193   if (posneg * 2 != wheel)
0194     return dummy;
0195   if (station > 3)
0196     return dummy;
0197 
0198   //FIXME: update the following two lines with proper method when Connections introduced

0199   if (processor != 6 && !(sector >= processor * 2 - 1 && sector <= processor * 2 + 1))
0200     return dummy;
0201   if (processor == 6 && !(sector >= 11 || sector == 1))
0202     return dummy;
0203 
0204   // ichamber is consecutive chamber connected to processor, starting from 0 (overlaping one)

0205   int ichamber = sector - 1 - 2 * (processor - 1);
0206   if (ichamber < 0)
0207     ichamber += 12;
0208 
0209   int offsetLoc = lround(((ichamber - 1) * M_PI / 6 + M_PI / 12.) / hsPhiPitch);
0210   double scale = 1. / 4096 / hsPhiPitch;
0211   int scale_coeff = lround(scale * pow(2, 11));
0212   //  int phi = static_cast<int>(phiDT*scale) + offsetLoc;

0213   int phi = floor(phiDT * scale_coeff / pow(2, 11)) + offsetLoc;
0214 
0215   return phi;
0216 }
0217 ///////////////////////////////////////

0218 ///////////////////////////////////////

0219 int AngleConverter::getProcessorPhi(unsigned int iProcessor,
0220                                     l1t::tftype part,
0221                                     const CSCDetId &csc,
0222                                     const CSCCorrelatedLCTDigi &digi) const {
0223   const double hsPhiPitch = 2 * M_PI / nPhiBins;
0224   const int dummy = nPhiBins;
0225   int processor = iProcessor + 1;                         // FIXME: get from OMTF name when available

0226   int posneg = (part == l1t::tftype::omtf_pos) ? 1 : -1;  // FIXME: get from OMTF name

0227 
0228   // filter out chambers not connected to OMTF board

0229   // FIXME: temporary - use Connections or relay that filtering done before.

0230   if (posneg != csc.zendcap())
0231     return dummy;
0232   if (csc.ring() != 3 && !(csc.ring() == 2 && (csc.station() == 2 || csc.station() == 3 || csc.station() == 1)))
0233     return dummy;
0234   if (processor != 6) {
0235     if (csc.chamber() < (processor - 1) * 6 + 2)
0236       return dummy;
0237     if (csc.chamber() > (processor - 1) * 6 + 8)
0238       return dummy;
0239   } else {
0240     if (csc.chamber() > 2 && csc.chamber() < 32)
0241       return dummy;
0242   }
0243 
0244   //

0245   // assign number 0..6, consecutive processor for a processor

0246   //

0247   //int ichamber = (csc.chamber()-2-6*(processor-1));

0248   //if (ichamber < 0) ichamber += 36;

0249 
0250   //

0251   // get offset for each chamber.

0252   // FIXME: These parameters depends on processor and chamber only so may be precomputed and put in map

0253   //

0254   const CSCChamber *chamber = _geocsc->chamber(csc);
0255   const CSCChamberSpecs *cspec = chamber->specs();
0256   const CSCLayer *layer = chamber->layer(3);
0257   int order = (layer->centerOfStrip(2).phi() - layer->centerOfStrip(1).phi() > 0) ? 1 : -1;
0258   double stripPhiPitch = cspec->stripPhiPitch();
0259   double scale = fabs(stripPhiPitch / hsPhiPitch / 2.);
0260   if (fabs(scale - 1.) < 0.0002)
0261     scale = 1.;
0262   double phi15deg = M_PI / 3. * (processor - 1) + M_PI / 12.;
0263   double phiHalfStrip0 = layer->centerOfStrip(10).phi() - order * 9 * stripPhiPitch - order * stripPhiPitch / 4.;
0264   if (processor == 6 || phiHalfStrip0 < 0)
0265     phiHalfStrip0 += 2 * M_PI;
0266   int offsetLoc = lround((phiHalfStrip0 - phi15deg) / hsPhiPitch);
0267 
0268   int halfStrip = digi.getStrip();  // returns halfStrip 0..159

0269   //FIXME: to be checked (only important for ME1/3) keep more bits for offset, truncate at the end

0270 
0271   // a quick fix for towards geometry changes due to global tag.

0272   // in case of MC tag fixOff shold be identical to offsetLoc

0273   int fixOff = fixCscOffsetGeom(offsetLoc);
0274 
0275   int phi = fixOff + order * scale * halfStrip;
0276 
0277   //  std::cout <<" hs: "<< halfStrip <<" offset: " << offsetLoc <<" oder*scale: "<< order*scale

0278   //            <<" phi: " <<phi<<" ("<<offsetLoc + order*scale*halfStrip<<")"<< std::endl;

0279 
0280   return phi;
0281 }
0282 
0283 ///////////////////////////////////////

0284 ///////////////////////////////////////

0285 int AngleConverter::getProcessorPhi(unsigned int iProcessor,
0286                                     l1t::tftype part,
0287                                     const RPCDetId &rollId,
0288                                     const unsigned int &digi1,
0289                                     const unsigned int &digi2) const {
0290   const double hsPhiPitch = 2 * M_PI / nPhiBins;
0291   const int dummy = nPhiBins;
0292   int processor = iProcessor + 1;
0293   const RPCRoll *roll = _georpc->roll(rollId);
0294   if (!roll)
0295     return dummy;
0296 
0297   double phi15deg =
0298       M_PI / 3. * (processor - 1) + M_PI / 12.;  // "0" is 15degree moved cyclicaly to each processor, note [0,2pi]

0299   double stripPhi1 = (roll->toGlobal(roll->centreOfStrip((int)digi1))).phi();  // note [-pi,pi]

0300   double stripPhi2 = (roll->toGlobal(roll->centreOfStrip((int)digi2))).phi();  // note [-pi,pi]

0301 
0302   // stripPhi from geometry is given in [-pi,pi] range.

0303   // Keep like that for OMTFp1 [15-10deg,75deg] and OMTFp6 [-45-10deg,15deg].

0304   // For OMTFp2..OMTFp5  move to [0,2pi] range

0305   switch (processor) {
0306     case 1:
0307       break;
0308     case 6: {
0309       phi15deg -= 2 * M_PI;
0310       break;
0311     }
0312     default: {
0313       if (stripPhi1 < 0)
0314         stripPhi1 += 2 * M_PI;
0315       if (stripPhi2 < 0)
0316         stripPhi2 += 2 * M_PI;
0317       break;
0318     }
0319   }
0320 
0321   // local angle in CSC halfStrip usnits

0322   int halfStrip = lround(((stripPhi1 + stripPhi2) / 2. - phi15deg) / hsPhiPitch);
0323 
0324   return halfStrip;
0325 }
0326 
0327 int AngleConverter::getProcessorPhi(unsigned int iProcessor,
0328                                     l1t::tftype part,
0329                                     const RPCDetId &rollId,
0330                                     const unsigned int &digi) const {
0331   const double hsPhiPitch = 2 * M_PI / nPhiBins;
0332   const int dummy = nPhiBins;
0333   int processor = iProcessor + 1;
0334   const RPCRoll *roll = _georpc->roll(rollId);
0335   if (!roll)
0336     return dummy;
0337 
0338   double phi15deg =
0339       M_PI / 3. * (processor - 1) + M_PI / 12.;  // "0" is 15degree moved cyclicaly to each processor, note [0,2pi]

0340   double stripPhi = (roll->toGlobal(roll->centreOfStrip((int)digi))).phi();  // note [-pi,pi]

0341 
0342   // adjust [0,2pi] and [-pi,pi] to get deltaPhi difference properly

0343   switch (processor) {
0344     case 1:
0345       break;
0346     case 6: {
0347       phi15deg -= 2 * M_PI;
0348       break;
0349     }
0350     default: {
0351       if (stripPhi < 0)
0352         stripPhi += 2 * M_PI;
0353       break;
0354     }
0355   }
0356 
0357   // local angle in CSC halfStrip usnits

0358   int halfStrip = lround((stripPhi - phi15deg) / hsPhiPitch);
0359 
0360   return halfStrip;
0361 }
0362 ///////////////////////////////////////

0363 ///////////////////////////////////////

0364 int AngleConverter::getGlobalEta(unsigned int rawid,
0365                                  const L1MuDTChambPhDigi &aDigi,
0366                                  const L1MuDTChambThContainer *dtThDigis) {
0367   const DTChamberId baseid(aDigi.whNum(), aDigi.stNum(), aDigi.scNum() + 1);
0368 
0369   // do not use this pointer for anything other than creating a trig geom

0370   std::unique_ptr<DTChamber> chamb(const_cast<DTChamber *>(_geodt->chamber(baseid)));
0371 
0372   std::unique_ptr<DTTrigGeom> trig_geom(new DTTrigGeom(chamb.get(), false));
0373   chamb.release();  // release it here so no one gets funny ideas

0374   // super layer one is the theta superlayer in a DT chamber

0375   // station 4 does not have a theta super layer

0376   // the BTI index from the theta trigger is an OR of some BTI outputs

0377   // so, we choose the BTI that's in the middle of the group

0378   // as the BTI that we get theta from

0379   // TODO:::::>>> need to make sure this ordering doesn't flip under wheel sign

0380   const int NBTI_theta = ((baseid.station() != 4) ? trig_geom->nCell(2) : trig_geom->nCell(3));
0381 
0382   //  const int bti_group = findBTIgroup(aDigi,dtThDigis);

0383   //  const unsigned bti_actual = bti_group*NBTI_theta/7 + NBTI_theta/14 + 1;

0384   //  DTBtiId thetaBTI;

0385   //  if ( baseid.station() != 4 && bti_group != -1) {

0386   //    thetaBTI = DTBtiId(baseid,2,bti_actual);

0387   //  } else {

0388   //    // since this is phi oriented it'll give us theta in the middle

0389   //    // of the chamber

0390   //    thetaBTI = DTBtiId(baseid,3,1);

0391   //  }

0392   //  const GlobalPoint theta_gp = trig_geom->CMSPosition(thetaBTI);

0393   //  int iEta = theta_gp.eta()/2.61*240;

0394   //  return iEta;

0395 
0396   const L1MuDTChambThDigi *theta_segm =
0397       dtThDigis->chThetaSegm(aDigi.whNum(), aDigi.stNum(), aDigi.scNum(), aDigi.bxNum());
0398   int bti_group = -1;
0399   if (theta_segm) {
0400     for (unsigned int i = 0; i < 7; ++i)
0401       if (theta_segm->position(i) && bti_group < 0)
0402         bti_group = i;
0403       else if (theta_segm->position(i) && bti_group > -1)
0404         bti_group = 511;
0405   }
0406 
0407   int iEta = 0;
0408   if (bti_group == 511)
0409     iEta = 95;
0410   else if (bti_group == -1 && aDigi.stNum() == 1)
0411     iEta = 92;
0412   else if (bti_group == -1 && aDigi.stNum() == 2)
0413     iEta = 79;
0414   else if (bti_group == -1 && aDigi.stNum() == 3)
0415     iEta = 75;
0416   else if (baseid.station() != 4 && bti_group >= 0) {
0417     //    bti_group = 6-bti_group;

0418     unsigned bti_actual = bti_group * NBTI_theta / 7 + NBTI_theta / 14 + 1;
0419     DTBtiId thetaBTI = DTBtiId(baseid, 2, bti_actual);
0420     GlobalPoint theta_gp = trig_geom->CMSPosition(thetaBTI);
0421     iEta = etaVal2Code(fabs(theta_gp.eta()));
0422   }
0423   int signEta = sgn(aDigi.whNum());
0424   iEta *= signEta;
0425   return iEta;
0426 }
0427 
0428 ///////////////////////////////////////

0429 ///////////////////////////////////////

0430 int AngleConverter::getGlobalEta(unsigned int rawid, const CSCCorrelatedLCTDigi &aDigi) {
0431   ///Code taken from GeometryTranslator.

0432   ///Will be replaced by direct CSC phi local to global scale

0433   ///transformation as used in FPGA implementation

0434 
0435   // alot of this is transcription and consolidation of the CSC

0436   // global phi calculation code

0437   // this works directly with the geometry

0438   // rather than using the old phi luts

0439   const CSCDetId id(rawid);
0440   // we should change this to weak_ptrs at some point

0441   // requires introducing std::shared_ptrs to geometry

0442   std::unique_ptr<const CSCChamber> chamb(_geocsc->chamber(id));
0443   std::unique_ptr<const CSCLayerGeometry> layer_geom(chamb->layer(CSCConstants::KEY_ALCT_LAYER)->geometry());
0444   std::unique_ptr<const CSCLayer> layer(chamb->layer(CSCConstants::KEY_ALCT_LAYER));
0445 
0446   const uint16_t halfstrip = aDigi.getStrip();
0447   const uint16_t pattern = aDigi.getPattern();
0448   const uint16_t keyWG = aDigi.getKeyWG();
0449   //const unsigned maxStrips = layer_geom->numberOfStrips();

0450 
0451   // so we can extend this later

0452   // assume TMB2007 half-strips only as baseline

0453   double offset = 0.0;
0454   switch (1) {
0455     case 1:
0456       offset = CSCPatternBank::getLegacyPosition(pattern);
0457   }
0458   const unsigned halfstrip_offs = unsigned(0.5 + halfstrip + offset);
0459   const unsigned strip = halfstrip_offs / 2 + 1;  // geom starts from 1

0460 
0461   // the rough location of the hit at the ALCT key layer

0462   // we will refine this using the half strip information

0463   const LocalPoint coarse_lp = layer_geom->stripWireGroupIntersection(strip, keyWG);
0464   const GlobalPoint coarse_gp = layer->surface().toGlobal(coarse_lp);
0465 
0466   // the strip width/4.0 gives the offset of the half-strip

0467   // center with respect to the strip center

0468   const double hs_offset = layer_geom->stripPhiPitch() / 4.0;
0469 
0470   // determine handedness of the chamber

0471   const bool ccw = isCSCCounterClockwise(layer);
0472   // we need to subtract the offset of even half strips and add the odd ones

0473   const double phi_offset = ((halfstrip_offs % 2 ? 1 : -1) * (ccw ? -hs_offset : hs_offset));
0474 
0475   // the global eta calculation uses the middle of the strip

0476   // so no need to increment it

0477   const GlobalPoint final_gp(
0478       GlobalPoint::Polar(coarse_gp.theta(), (coarse_gp.phi().value() + phi_offset), coarse_gp.mag()));
0479   // release ownership of the pointers

0480   chamb.release();
0481   layer_geom.release();
0482   layer.release();
0483 
0484   //  std::cout <<id<<" st: " << id.station()<< "ri: "<<id.ring()<<" eta: " <<  final_gp.eta()

0485   //           <<" etaCode_simple: " <<  etaVal2Code( final_gp.eta() )<< " KW: "<<keyWG <<" etaKeyWG2Code: "<<etaKeyWG2Code(id,keyWG)<< std::endl;

0486   //  int station = (id.endcap()==1) ? id.station() : -id.station();

0487   //  std::cout <<"ETA_CSC: " << station <<" "<<id.ring()<<" "<< final_gp.eta()<<" "<<keyWG <<" "<< etaKeyWG2Code(id,keyWG) << std::endl;

0488 
0489   return etaKeyWG2Code(id, keyWG);
0490 
0491   // return etaVal2Code( final_gp.eta() );

0492   // int iEta =  final_gp.eta()/2.61*240;

0493   // return iEta;

0494 }
0495 ///////////////////////////////////////

0496 ///////////////////////////////////////

0497 int AngleConverter::getGlobalEta(unsigned int rawid, const unsigned int &strip) {
0498   const RPCDetId id(rawid);
0499   std::unique_ptr<const RPCRoll> roll(_georpc->roll(id));
0500   const LocalPoint lp = roll->centreOfStrip((int)strip);
0501   const GlobalPoint gp = roll->toGlobal(lp);
0502   roll.release();
0503 
0504   return etaVal2Code(gp.eta());
0505   //  float iEta = gp.eta()/2.61*240;

0506   //  return iEta;

0507 }
0508 ///////////////////////////////////////

0509 ///////////////////////////////////////

0510 bool AngleConverter::isCSCCounterClockwise(const std::unique_ptr<const CSCLayer> &layer) const {
0511   const int nStrips = layer->geometry()->numberOfStrips();
0512   const double phi1 = layer->centerOfStrip(1).phi();
0513   const double phiN = layer->centerOfStrip(nStrips).phi();
0514   return ((std::abs(phi1 - phiN) < M_PI && phi1 >= phiN) || (std::abs(phi1 - phiN) >= M_PI && phi1 < phiN));
0515 }
0516 ///////////////////////////////////////

0517 ///////////////////////////////////////

0518 const int AngleConverter::findBTIgroup(const L1MuDTChambPhDigi &aDigi, const L1MuDTChambThContainer *dtThDigis) {
0519   int bti_group = -1;
0520 
0521   const L1MuDTChambThDigi *theta_segm =
0522       dtThDigis->chThetaSegm(aDigi.whNum(), aDigi.stNum(), aDigi.scNum(), aDigi.bxNum());
0523   if (!theta_segm)
0524     return bti_group;
0525 
0526   for (unsigned int i = 0; i < 7; ++i) {
0527     if (theta_segm->position(i) && bti_group < 0)
0528       bti_group = i;
0529     ///If there are more than one theta digi we do not take is

0530     ///due to unresolvet ambiguity. In this case we take eta of the

0531     ///middle of the chamber.

0532     else if (theta_segm->position(i) && bti_group > -1)
0533       return -1;
0534   }
0535 
0536   return bti_group;
0537 }
0538 ///////////////////////////////////////

0539 ///////////////////////////////////////
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