#include <DTSegment4DQuality.h>

Inheritance diagram for DTSegment4DQuality:

Public Member Functions
	DTSegment4DQuality (const edm::ParameterSet &pset)
	Constructor. More...

Public Member Functions inherited from DQMGlobalEDAnalyzer< dtsegment4d::Histograms >
virtual void	dqmEndRun (edm::Run const &, edm::EventSetup const &, dtsegment4d::Histograms const &) const

void	globalEndRunProduce (edm::Run &run, edm::EventSetup const &setup) const final

Public Member Functions inherited from DQMGlobalEDAnalyzerBase< dtsegment4d::Histograms, Args... >
void	accumulate (edm::StreamID id, edm::Event const &event, edm::EventSetup const &setup) const final

virtual void	dqmBeginRun (edm::Run const &, edm::EventSetup const &, dtsegment4d::Histograms &) const

	DQMGlobalEDAnalyzerBase ()

std::shared_ptr< dtsegment4d::Histograms >	globalBeginRun (edm::Run const &run, edm::EventSetup const &setup) const final

void	globalEndRun (edm::Run const &, edm::EventSetup const &) const final

Public Member Functions inherited from edm::global::EDProducer< edm::RunCache< dtsegment4d::Histograms >, edm::EndRunProducer, edm::Accumulator, Args... >
	EDProducer ()=default

	EDProducer (const EDProducer &)=delete

bool	hasAbilityToProduceInBeginLumis () const final

bool	hasAbilityToProduceInBeginProcessBlocks () const final

bool	hasAbilityToProduceInBeginRuns () const final

bool	hasAbilityToProduceInEndLumis () const final

bool	hasAbilityToProduceInEndProcessBlocks () const final

bool	hasAbilityToProduceInEndRuns () const final

EDProducer &	operator= (const EDProducer &)=delete

bool	wantsGlobalLuminosityBlocks () const final

bool	wantsGlobalRuns () const final

bool	wantsInputProcessBlocks () const final

bool	wantsProcessBlocks () const final

bool	wantsStreamLuminosityBlocks () const final

bool	wantsStreamRuns () const final

Public Member Functions inherited from edm::global::EDProducerBase
	EDProducerBase ()

ModuleDescription const &	moduleDescription () const

	~EDProducerBase () override

Public Member Functions inherited from edm::ProducerBase
void	callWhenNewProductsRegistered (std::function< void(BranchDescription const &)> const &func)

std::vector< edm::ProductResolverIndex > const &	indiciesForPutProducts (BranchType iBranchType) const

	ProducerBase ()

std::vector< edm::ProductResolverIndex > const &	putTokenIndexToProductResolverIndex () const

std::vector< bool > const &	recordProvenanceList () const

void	registerProducts (ProducerBase , ProductRegistry , ModuleDescription const &)

std::function< void(BranchDescription const &)>	registrationCallback () const
	used by the fwk to register list of products More...

void	resolvePutIndicies (BranchType iBranchType, ModuleToResolverIndicies const &iIndicies, std::string const &moduleLabel)

TypeLabelList const &	typeLabelList () const
	used by the fwk to register the list of products of this module More...

	~ProducerBase () noexcept(false) override

Public Member Functions inherited from edm::EDConsumerBase
std::vector< ConsumesInfo >	consumesInfo () const

void	convertCurrentProcessAlias (std::string const &processName)
	Convert "@currentProcess" in InputTag process names to the actual current process name. More...

	EDConsumerBase ()

	EDConsumerBase (EDConsumerBase const &)=delete

	EDConsumerBase (EDConsumerBase &&)=default

ESProxyIndex const *	esGetTokenIndices (edm::Transition iTrans) const

std::vector< ESProxyIndex > const &	esGetTokenIndicesVector (edm::Transition iTrans) const

std::vector< ESRecordIndex > const &	esGetTokenRecordIndicesVector (edm::Transition iTrans) const

ProductResolverIndexAndSkipBit	indexFrom (EDGetToken, BranchType, TypeID const &) const

void	itemsMayGet (BranchType, std::vector< ProductResolverIndexAndSkipBit > &) const

void	itemsToGet (BranchType, std::vector< ProductResolverIndexAndSkipBit > &) const

std::vector< ProductResolverIndexAndSkipBit > const &	itemsToGetFrom (BranchType iType) const

void	labelsForToken (EDGetToken iToken, Labels &oLabels) const

void	modulesWhoseProductsAreConsumed (std::array< std::vector< ModuleDescription const > , NumBranchTypes > &modulesAll, std::vector< ModuleProcessName > &modulesInPreviousProcesses, ProductRegistry const &preg, std::map< std::string, ModuleDescription const *> const &labelsToDesc, std::string const &processName) const

EDConsumerBase const &	operator= (EDConsumerBase const &)=delete

EDConsumerBase &	operator= (EDConsumerBase &&)=default

bool	registeredToConsume (ProductResolverIndex, bool, BranchType) const

bool	registeredToConsumeMany (TypeID const &, BranchType) const

void	selectInputProcessBlocks (ProductRegistry const &productRegistry, ProcessBlockHelperBase const &processBlockHelperBase)

ProductResolverIndexAndSkipBit	uncheckedIndexFrom (EDGetToken) const

void	updateLookup (BranchType iBranchType, ProductResolverIndexHelper const &, bool iPrefetchMayGet)

void	updateLookup (eventsetup::ESRecordsToProxyIndices const &)

virtual	~EDConsumerBase () noexcept(false)

Private Member Functions
void	bookHistograms (DQMStore::IBooker &, edm::Run const &, edm::EventSetup const &, dtsegment4d::Histograms &) const override
	Book the DQM plots. More...

void	dqmAnalyze (edm::Event const &, edm::EventSetup const &, dtsegment4d::Histograms const &) const override
	Perform the real analysis. More...

Private Attributes
bool	debug_

bool	doall_

bool	local_

edm::ESGetToken< DTGeometry, MuonGeometryRecord >	muonGeomToken_

edm::InputTag	segment4DLabel_

edm::EDGetTokenT< DTRecSegment4DCollection >	segment4DToken_

double	sigmaResAlpha_

double	sigmaResBeta_

double	sigmaResX_

double	sigmaResY_

edm::InputTag	simHitLabel_

edm::EDGetTokenT< edm::PSimHitContainer >	simHitToken_

Additional Inherited Members
Public Types inherited from DQMGlobalEDAnalyzerBase< dtsegment4d::Histograms, Args... >
typedef dqm::reco::DQMStore	DQMStore

typedef dqm::reco::MonitorElement	MonitorElement

Public Types inherited from edm::global::EDProducerBase
typedef EDProducerBase	ModuleType

Public Types inherited from edm::ProducerBase
template<typename T >
using	BranchAliasSetterT = ProductRegistryHelper::BranchAliasSetterT< T >

using	ModuleToResolverIndicies = std::unordered_multimap< std::string, std::tuple< edm::TypeID const , const char , edm::ProductResolverIndex > >

typedef ProductRegistryHelper::TypeLabelList	TypeLabelList

Public Types inherited from edm::EDConsumerBase
typedef ProductLabels	Labels

Static Public Member Functions inherited from edm::global::EDProducerBase
static const std::string &	baseType ()

static void	fillDescriptions (ConfigurationDescriptions &descriptions)

static void	prevalidate (ConfigurationDescriptions &descriptions)

Protected Member Functions inherited from DQMGlobalEDAnalyzerBase< dtsegment4d::Histograms, Args... >
uint64_t	meId (edm::Run const &run) const

Protected Member Functions inherited from edm::ProducerBase
template<Transition Tr = Transition::Event>
auto	produces (std::string instanceName) noexcept
	declare what type of product will make and with which optional label More...

template<Transition B>
BranchAliasSetter	produces (const TypeID &id, std::string instanceName=std::string(), bool recordProvenance=true)

template<BranchType B>
BranchAliasSetter	produces (const TypeID &id, std::string instanceName=std::string(), bool recordProvenance=true)

BranchAliasSetter	produces (const TypeID &id, std::string instanceName=std::string(), bool recordProvenance=true)

template<typename ProductType , Transition B>
BranchAliasSetterT< ProductType >	produces (std::string instanceName)

template<class ProductType >
BranchAliasSetterT< ProductType >	produces ()

template<typename ProductType , BranchType B>
BranchAliasSetterT< ProductType >	produces (std::string instanceName)

template<typename ProductType , BranchType B>
BranchAliasSetterT< ProductType >	produces ()

template<class ProductType >
BranchAliasSetterT< ProductType >	produces (std::string instanceName)

template<typename ProductType , Transition B>
BranchAliasSetterT< ProductType >	produces ()

template<Transition Tr = Transition::Event>
auto	produces () noexcept

ProducesCollector	producesCollector ()

Protected Member Functions inherited from edm::EDConsumerBase
template<typename ProductType , BranchType B = InEvent>
EDGetTokenT< ProductType >	consumes (edm::InputTag const &tag)

template<BranchType B = InEvent>
EDConsumerBaseAdaptor< B >	consumes (edm::InputTag tag) noexcept

EDGetToken	consumes (const TypeToGet &id, edm::InputTag const &tag)

template<BranchType B>
EDGetToken	consumes (TypeToGet const &id, edm::InputTag const &tag)

ConsumesCollector	consumesCollector ()
	Use a ConsumesCollector to gather consumes information from helper functions. More...

template<typename ProductType , BranchType B = InEvent>
void	consumesMany ()

void	consumesMany (const TypeToGet &id)

template<BranchType B>
void	consumesMany (const TypeToGet &id)

template<typename ESProduct , typename ESRecord , Transition Tr = Transition::Event>
auto	esConsumes ()

template<typename ESProduct , typename ESRecord , Transition Tr = Transition::Event>
auto	esConsumes (ESInputTag const &tag)

template<Transition Tr = Transition::Event>
constexpr auto	esConsumes ()

template<Transition Tr = Transition::Event>
auto	esConsumes (ESInputTag tag)

template<Transition Tr = Transition::Event>
ESGetTokenGeneric	esConsumes (eventsetup::EventSetupRecordKey const &iRecord, eventsetup::DataKey const &iKey)
	Used with EventSetupRecord::doGet. More...

template<typename ProductType , BranchType B = InEvent>
EDGetTokenT< ProductType >	mayConsume (edm::InputTag const &tag)

EDGetToken	mayConsume (const TypeToGet &id, edm::InputTag const &tag)

template<BranchType B>
EDGetToken	mayConsume (const TypeToGet &id, edm::InputTag const &tag)

void	resetItemsToGetFrom (BranchType iType)

Protected Attributes inherited from DQMGlobalEDAnalyzerBase< dtsegment4d::Histograms, Args... >
DQMStore *	dqmstore_

edm::EDPutTokenT< DQMToken >	runToken_

Detailed Description

Basic analyzer class which accesses 4D DTSegments and plots resolution comparing reconstructed and simulated quantities

Only true 4D segments are considered. Station 4 segments are not looked at. FIXME: Add flag to consider also segments with only phi view? Possible bias?

Residual/pull plots are filled for the reco segment with alpha closest to the simulated muon direction (defined from muon simhits in the chamber).

Efficiencies are defined as reconstructed 4D segments with alpha, beta, x, y, within 5 sigma relative to the sim muon, with sigmas specified in the config. Note that loss of even only one of the two views is considered as inefficiency!

Author: S. Bolognesi and G. Cerminara - INFN Torino

Definition at line 46 of file DTSegment4DQuality.h.

Constructor & Destructor Documentation

◆ DTSegment4DQuality()

DTSegment4DQuality::DTSegment4DQuality ( const edm::ParameterSet & pset )

Constructor.

Definition at line 55 of file DTSegment4DQuality.cc.

References DTHitQualityUtils::debug, debug_, doall_, local_, muonDTDigis_cfi::pset, segment4DLabel_, segment4DToken_, sigmaResAlpha_, sigmaResBeta_, sigmaResX_, sigmaResY_, simHitLabel_, and simHitToken_.

                                                                : muonGeomToken_(esConsumes()) {
   // Get the debug parameter for verbose output
   debug_ = pset.getUntrackedParameter<bool>("debug");
   DTHitQualityUtils::debug = debug_;
 
   // the name of the simhit collection
   simHitLabel_ = pset.getUntrackedParameter<InputTag>("simHitLabel");
   simHitToken_ = consumes<PSimHitContainer>(pset.getUntrackedParameter<InputTag>("simHitLabel"));
   // the name of the 2D rec hit collection
   segment4DLabel_ = pset.getUntrackedParameter<InputTag>("segment4DLabel");
   segment4DToken_ = consumes<DTRecSegment4DCollection>(pset.getUntrackedParameter<InputTag>("segment4DLabel"));
 
   // sigma resolution on position
   sigmaResX_ = pset.getParameter<double>("sigmaResX");
   sigmaResY_ = pset.getParameter<double>("sigmaResY");
   // sigma resolution on angle
   sigmaResAlpha_ = pset.getParameter<double>("sigmaResAlpha");
   sigmaResBeta_ = pset.getParameter<double>("sigmaResBeta");
   doall_ = pset.getUntrackedParameter<bool>("doall", false);
   local_ = pset.getUntrackedParameter<bool>("local", false);
 }

Member Function Documentation

◆ bookHistograms()

void DTSegment4DQuality::bookHistograms	(	DQMStore::IBooker &	booker,
		edm::Run const &	run,
		edm::EventSetup const &	setup,
		dtsegment4d::Histograms &	histograms
	)		const

overrideprivatevirtual

Book the DQM plots.

Implements DQMGlobalEDAnalyzerBase< dtsegment4d::Histograms, Args... >.

Definition at line 77 of file DTSegment4DQuality.cc.

References doall_, local_, Skims_PA_cff::name, alignCSCRings::s, and w().

                                                                       {
   histograms.h4DHit = std::make_unique<HRes4DHit>("All", booker, doall_, local_);
   histograms.h4DHit_W0 = std::make_unique<HRes4DHit>("W0", booker, doall_, local_);
   histograms.h4DHit_W1 = std::make_unique<HRes4DHit>("W1", booker, doall_, local_);
   histograms.h4DHit_W2 = std::make_unique<HRes4DHit>("W2", booker, doall_, local_);
 
   if (doall_) {
     histograms.hEff_All = std::make_unique<HEff4DHit>("All", booker);
     histograms.hEff_W0 = std::make_unique<HEff4DHit>("W0", booker);
     histograms.hEff_W1 = std::make_unique<HEff4DHit>("W1", booker);
     histograms.hEff_W2 = std::make_unique<HEff4DHit>("W2", booker);
   }
 
   if (local_) {
     // Plots with finer granularity, not to be included in DQM
     TString name = "W";
     for (long w = 0; w <= 2; ++w) {
       for (long s = 1; s <= 4; ++s) {
         // FIXME station 4 is not filled
         TString nameWS = (name + w + "_St" + s);
         histograms.h4DHitWS[w][s - 1] = std::make_unique<HRes4DHit>(nameWS.Data(), booker, doall_, local_);
         histograms.hEffWS[w][s - 1] = std::make_unique<HEff4DHit>(nameWS.Data(), booker);
       }
     }
   }
 };

◆ dqmAnalyze()

void DTSegment4DQuality::dqmAnalyze	(	edm::Event const &	event,
		edm::EventSetup const &	setup,
		dtsegment4d::Histograms const &	histograms
	)		const

overrideprivatevirtual

Perform the real analysis.

Implements DQMGlobalEDAnalyzerBase< dtsegment4d::Histograms, Args... >.

Definition at line 108 of file DTSegment4DQuality.cc.

References funct::abs(), relativeConstraints::chamber, DTGeometry::chamber(), funct::cos(), gather_cfg::cout, debug_, HLT_2022v15_cff::distance, doall_, MillePedeFileConverter_cfg::e, geometryDiff::epsilon, PV3DBase< T, PVType, FrameType >::eta(), HEff4DHit::fill(), DTHitQualityUtils::findMuSimSegment(), DTHitQualityUtils::findMuSimSegmentDirAndPos(), DTHitQualityUtils::findSegmentAlphaAndBeta(), timingPdfMaker::histo, edm::HandleBase::isValid(), local_, DTRecSegment4D::localDirection(), DTRecSegment2D::localDirection(), DTRecSegment4D::localDirectionError(), DTRecSegment2D::localDirectionError(), DTRecSegment4D::localPosition(), DTRecSegment2D::localPosition(), DTRecSegment4D::localPositionError(), DTRecSegment2D::localPositionError(), DTHitQualityUtils::mapMuSimHitsPerWire(), DTHitQualityUtils::mapSimHitsPerWire(), muonGeomToken_, PV3DBase< T, PVType, FrameType >::phi(), DTRecSegment4D::phiSegment(), FastTimerService_cff::range, DTRecSegment2D::recHits(), segment4DLabel_, segment4DToken_, singleTopDQM_cfi::setup, DTHitQualityUtils::sigmaAngle(), rpcPointValidation_cfi::simHit, FastTrackerRecHitCombiner_cfi::simHits, simHitToken_, mathSSE::sqrt(), DTChamberId::station(), relativeConstraints::station, DTGeometry::superLayer(), DTSLRecSegment2D::superLayerId(), DTRecSegment2D::t0(), PV3DBase< T, PVType, FrameType >::theta(), GeomDet::toLocal(), DTChamberId::wheel(), makeMuonMisalignmentScenario::wheel, PV3DBase< T, PVType, FrameType >::x(), LocalError::xx(), PV3DBase< T, PVType, FrameType >::y(), LocalError::yy(), PV3DBase< T, PVType, FrameType >::z(), and DTRecSegment4D::zSegment().

                                                                         {
   const float epsilon = 5e-5;  // numerical accuracy on angles [rad}
 
   // Get the DT Geometry
   const DTGeometry &dtGeom = setup.getData(muonGeomToken_);
 
   // Get the SimHit collection from the event
   edm::Handle<PSimHitContainer> simHits;
   event.getByToken(simHitToken_, simHits);  // FIXME: second string to be removed
 
   // Map simHits by chamber
   map<DTChamberId, PSimHitContainer> simHitsPerCh;
   for (const auto &simHit : *simHits) {
     // Consider only muon simhits; the others are not considered elsewhere in
     // this class!
     if (abs(simHit.particleType()) == 13) {
       // Create the id of the chamber (the simHits in the DT known their wireId)
       DTChamberId chamberId = (((DTWireId(simHit.detUnitId())).layerId()).superlayerId()).chamberId();
       // Fill the map
       simHitsPerCh[chamberId].push_back(simHit);
     }
   }
 
   // Get the 4D rechits from the event
   Handle<DTRecSegment4DCollection> segment4Ds;
   event.getByToken(segment4DToken_, segment4Ds);
 
   if (!segment4Ds.isValid()) {
     if (debug_) {
       cout << "[DTSegment4DQuality]**Warning: no 4D Segments with label: " << segment4DLabel_
            << " in this event, skipping!" << endl;
     }
     return;
   }
 
   // Loop over all chambers containing a (muon) simhit
   for (auto &simHitsInChamber : simHitsPerCh) {
     DTChamberId chamberId = simHitsInChamber.first;
     int station = chamberId.station();
     if (station == 4 && !(local_)) {
       continue;  // use DTSegment2DSLPhiQuality to analyze MB4 performaces in DQM
     }
     int wheel = chamberId.wheel();
 
     //------------------------- simHits ---------------------------//
     // Get simHits of this chamber
     const PSimHitContainer &simHits = simHitsInChamber.second;
 
     // Map simhits per wire
     auto const &simHitsPerWire = DTHitQualityUtils::mapSimHitsPerWire(simHits);
     auto const &muSimHitPerWire = DTHitQualityUtils::mapMuSimHitsPerWire(simHitsPerWire);
     int nMuSimHit = muSimHitPerWire.size();
     if (nMuSimHit < 2) {  // Skip chamber with less than 2 cells with mu hits
       continue;
     }
     if (debug_) {
       cout << "=== Chamber " << chamberId << " has " << nMuSimHit << " SimHits" << endl;
     }
 
     // Find outer and inner mu SimHit to build a segment
     pair<const PSimHit *, const PSimHit *> inAndOutSimHit = DTHitQualityUtils::findMuSimSegment(muSimHitPerWire);
 
     // Consider only sim segments crossing at least 2 SLs
     if ((DTWireId(inAndOutSimHit.first->detUnitId())).superlayer() ==
         (DTWireId(inAndOutSimHit.second->detUnitId())).superLayer()) {
       continue;
     }
 
     // Find direction and position of the sim Segment in Chamber RF
     pair<LocalVector, LocalPoint> dirAndPosSimSegm =
         DTHitQualityUtils::findMuSimSegmentDirAndPos(inAndOutSimHit, chamberId, dtGeom);
 
     LocalVector simSegmLocalDir = dirAndPosSimSegm.first;
     LocalPoint simSegmLocalPos = dirAndPosSimSegm.second;
     const DTChamber *chamber = dtGeom.chamber(chamberId);
     GlobalPoint simSegmGlobalPos = chamber->toGlobal(simSegmLocalPos);
     GlobalVector simSegmGlobalDir = chamber->toGlobal(simSegmLocalDir);
 
     // phi and theta angle of simulated segment in Chamber RF
     float alphaSimSeg = DTHitQualityUtils::findSegmentAlphaAndBeta(simSegmLocalDir).first;
     float betaSimSeg = DTHitQualityUtils::findSegmentAlphaAndBeta(simSegmLocalDir).second;
     // x, y position of simulated segment in Chamber RF
     float xSimSeg = simSegmLocalPos.x();
     float ySimSeg = simSegmLocalPos.y();
     // Position (in eta, phi coordinates) in lobal RF
     float etaSimSeg = simSegmGlobalPos.eta();
     float phiSimSeg = simSegmGlobalPos.phi();
 
     double count_seg = 0;
 
     if (debug_) {
       cout << "  Simulated segment:  local direction " << simSegmLocalDir << endl
            << "                      local position  " << simSegmLocalPos << endl
            << "                      alpha           " << alphaSimSeg << endl
            << "                      beta            " << betaSimSeg << endl;
     }
 
     //---------------------------- recHits --------------------------//
     // Get the range of rechit for the corresponding chamberId
     bool recHitFound = false;
     DTRecSegment4DCollection::range range = segment4Ds->get(chamberId);
     int nsegm = distance(range.first, range.second);
     if (debug_) {
       cout << "   Chamber: " << chamberId << " has " << nsegm << " 4D segments" << endl;
     }
 
     if (nsegm != 0) {
       // Find the best RecHit: look for the 4D RecHit with the phi angle closest
       // to that of segment made of SimHits.
       // RecHits must have delta alpha and delta position within 5 sigma of
       // the residual distribution (we are looking for residuals of segments
       // usefull to the track fit) for efficency purpose
       const DTRecSegment4D *bestRecHit = nullptr;
       double deltaAlpha = 99999;
       double deltaBeta = 99999;
 
       // Loop over the recHits of this chamberId
       for (DTRecSegment4DCollection::const_iterator segment4D = range.first; segment4D != range.second; ++segment4D) {
         // Consider only segments with both projections
         if (station != 4 && (*segment4D).dimension() != 4) {
           continue;
         }
         // Segment Local Direction and position (in Chamber RF)
         LocalVector recSegDirection = (*segment4D).localDirection();
         LocalPoint recSegPosition = (*segment4D).localPosition();
 
         pair<double, double> ab = DTHitQualityUtils::findSegmentAlphaAndBeta(recSegDirection);
         float recSegAlpha = ab.first;
         float recSegBeta = ab.second;
 
         if (debug_) {
           cout << &(*segment4D) << "  RecSegment direction: " << recSegDirection << endl
                << "             position : " << (*segment4D).localPosition() << endl
                << "             alpha    : " << recSegAlpha << endl
                << "             beta     : " << recSegBeta << endl
                << "             nhits    : " << (*segment4D).phiSegment()->recHits().size() << " "
                << (((*segment4D).zSegment() != nullptr) ? (*segment4D).zSegment()->recHits().size() : 0) << endl;
         }
 
         float dAlphaRecSim = fabs(recSegAlpha - alphaSimSeg);
         float dBetaRecSim = fabs(recSegBeta - betaSimSeg);
 
         if ((fabs(recSegPosition.x() - simSegmLocalPos.x()) <
              4)  // require rec and sim segments to be ~in the same cell in x
             && ((fabs(recSegPosition.y() - simSegmLocalPos.y()) < 4) ||
                 (*segment4D).dimension() < 4)) {  // ~in the same cell in y, if segment has the theta view
           ++count_seg;
 
           if (fabs(dAlphaRecSim - deltaAlpha) < epsilon) {  // Numerically equivalent alphas, choose based on beta
             if (dBetaRecSim < deltaBeta) {
               deltaAlpha = dAlphaRecSim;
               deltaBeta = dBetaRecSim;
               bestRecHit = &(*segment4D);
             }
 
           } else if (dAlphaRecSim < deltaAlpha) {
             deltaAlpha = dAlphaRecSim;
             deltaBeta = dBetaRecSim;
             bestRecHit = &(*segment4D);
           }
         }
 
       }  // End of Loop over all 4D RecHits
 
       if (bestRecHit) {
         if (debug_) {
           cout << endl << "Chosen: " << bestRecHit << endl;
         }
         // Best rechit direction and position in Chamber RF
         LocalPoint bestRecHitLocalPos = bestRecHit->localPosition();
         LocalVector bestRecHitLocalDir = bestRecHit->localDirection();
         // Errors on x and y
         LocalError bestRecHitLocalPosErr = bestRecHit->localPositionError();
         LocalError bestRecHitLocalDirErr = bestRecHit->localDirectionError();
 
         pair<double, double> ab = DTHitQualityUtils::findSegmentAlphaAndBeta(bestRecHitLocalDir);
         float alphaBestRHit = ab.first;
         float betaBestRHit = ab.second;
         // Errors on alpha and beta
 
         // Get position and direction using the rx projection (so in SL
         // reference frame). Note that x (and y) are swapped wrt to Chamber
         // frame
         // if (bestRecHit->hasZed()) //
         const DTSLRecSegment2D *zedRecSeg = bestRecHit->zSegment();
         LocalPoint bestRecHitLocalPosRZ;
         LocalVector bestRecHitLocalDirRZ;
         LocalError bestRecHitLocalPosErrRZ;
         LocalError bestRecHitLocalDirErrRZ;
         LocalPoint simSegLocalPosRZ;  // FIXME: this is not set for segments with
                                       // only the phi view.
         float alphaBestRHitRZ = 0;    // angle measured in the RZ SL, in its own frame
         float alphaSimSegRZ = betaSimSeg;
         if (zedRecSeg) {
           bestRecHitLocalPosRZ = zedRecSeg->localPosition();
           bestRecHitLocalDirRZ = zedRecSeg->localDirection();
           // Errors on x and y
           bestRecHitLocalPosErrRZ = zedRecSeg->localPositionError();
           bestRecHitLocalDirErrRZ = zedRecSeg->localDirectionError();
 
           // angle measured in the RZ SL, in its own frame
           alphaBestRHitRZ = DTHitQualityUtils::findSegmentAlphaAndBeta(bestRecHitLocalDirRZ).first;
 
           // Get SimSeg position and Direction in rZ SL frame
           const DTSuperLayer *sl = dtGeom.superLayer(zedRecSeg->superLayerId());
           LocalPoint simSegLocalPosRZTmp = sl->toLocal(simSegmGlobalPos);
           LocalVector simSegLocalDirRZ = sl->toLocal(simSegmGlobalDir);
           simSegLocalPosRZ =
               simSegLocalPosRZTmp + simSegLocalDirRZ * (-simSegLocalPosRZTmp.z() / (cos(simSegLocalDirRZ.theta())));
           alphaSimSegRZ = DTHitQualityUtils::findSegmentAlphaAndBeta(simSegLocalDirRZ).first;
 
           if (debug_) {
             cout << "RZ SL: recPos " << bestRecHitLocalPosRZ << "recDir " << bestRecHitLocalDirRZ << "recAlpha "
                  << alphaBestRHitRZ << endl
                  << "RZ SL: simPos " << simSegLocalPosRZ << "simDir " << simSegLocalDirRZ << "simAlpha "
                  << alphaSimSegRZ << endl;
           }
         }
 
         // get nhits and t0
         const DTChamberRecSegment2D *phiSeg = bestRecHit->phiSegment();
 
         float t0phi = -999;
         float t0theta = -999;
         int nHitPhi = 0;
         int nHitTheta = 0;
 
         if (phiSeg) {
           t0phi = phiSeg->t0();
           nHitPhi = phiSeg->recHits().size();
         }
 
         if (zedRecSeg) {
           t0theta = zedRecSeg->t0();
           nHitTheta = zedRecSeg->recHits().size();
         }
 
         recHitFound = true;
 
         // Mirror alpha in phi SLs so that + and - wheels can be plotted
         // together
         if (mirrorMinusWheels && wheel < 0) {
           alphaSimSeg *= -1.;
           alphaBestRHit *= -1.;
           // Note: local X (xSimSeg, bestRecHitLocalPos.x() would have to be
           // mirrored as well; but at the moment there is no plot of dependency
           // vs X, except for efficiency.
         }
 
         // Fill Residual histos
         HRes4DHit *histo = nullptr;
 
         if (wheel == 0) {
           histo = histograms.h4DHit_W0.get();
         } else if (abs(wheel) == 1) {
           histo = histograms.h4DHit_W1.get();
         } else if (abs(wheel) == 2) {
           histo = histograms.h4DHit_W2.get();
         }
 
         float sigmaAlphaBestRhit = sqrt(DTHitQualityUtils::sigmaAngle(alphaBestRHit, bestRecHitLocalDirErr.xx()));
         float sigmaBetaBestRhit =
             sqrt(DTHitQualityUtils::sigmaAngle(betaBestRHit,
                                                bestRecHitLocalDirErr.yy()));  // FIXME this misses the contribution
                                                                               // from uncertainty in extrapolation!
         float sigmaAlphaBestRhitRZ = sqrt(DTHitQualityUtils::sigmaAngle(alphaBestRHitRZ, bestRecHitLocalDirErrRZ.xx()));
 
         histo->fill(alphaSimSeg,
                     alphaBestRHit,
                     betaSimSeg,
                     betaBestRHit,
                     xSimSeg,
                     bestRecHitLocalPos.x(),
                     ySimSeg,
                     bestRecHitLocalPos.y(),
                     etaSimSeg,
                     phiSimSeg,
                     bestRecHitLocalPosRZ.x(),
                     simSegLocalPosRZ.x(),
                     alphaBestRHitRZ,
                     alphaSimSegRZ,
                     sigmaAlphaBestRhit,
                     sigmaBetaBestRhit,
                     sqrt(bestRecHitLocalPosErr.xx()),
                     sqrt(bestRecHitLocalPosErr.yy()),
                     sigmaAlphaBestRhitRZ,
                     sqrt(bestRecHitLocalPosErrRZ.xx()),
                     nHitPhi,
                     nHitTheta,
                     t0phi,
                     t0theta);
 
         histograms.h4DHit->fill(alphaSimSeg,
                                 alphaBestRHit,
                                 betaSimSeg,
                                 betaBestRHit,
                                 xSimSeg,
                                 bestRecHitLocalPos.x(),
                                 ySimSeg,
                                 bestRecHitLocalPos.y(),
                                 etaSimSeg,
                                 phiSimSeg,
                                 bestRecHitLocalPosRZ.x(),
                                 simSegLocalPosRZ.x(),
                                 alphaBestRHitRZ,
                                 alphaSimSegRZ,
                                 sigmaAlphaBestRhit,
                                 sigmaBetaBestRhit,
                                 sqrt(bestRecHitLocalPosErr.xx()),
                                 sqrt(bestRecHitLocalPosErr.yy()),
                                 sigmaAlphaBestRhitRZ,
                                 sqrt(bestRecHitLocalPosErrRZ.xx()),
                                 nHitPhi,
                                 nHitTheta,
                                 t0phi,
                                 t0theta);
 
         if (local_) {
           histograms.h4DHitWS[abs(wheel)][station - 1]->fill(alphaSimSeg,
                                                              alphaBestRHit,
                                                              betaSimSeg,
                                                              betaBestRHit,
                                                              xSimSeg,
                                                              bestRecHitLocalPos.x(),
                                                              ySimSeg,
                                                              bestRecHitLocalPos.y(),
                                                              etaSimSeg,
                                                              phiSimSeg,
                                                              bestRecHitLocalPosRZ.x(),
                                                              simSegLocalPosRZ.x(),
                                                              alphaBestRHitRZ,
                                                              alphaSimSegRZ,
                                                              sigmaAlphaBestRhit,
                                                              sigmaBetaBestRhit,
                                                              sqrt(bestRecHitLocalPosErr.xx()),
                                                              sqrt(bestRecHitLocalPosErr.yy()),
                                                              sigmaAlphaBestRhitRZ,
                                                              sqrt(bestRecHitLocalPosErrRZ.xx()),
                                                              nHitPhi,
                                                              nHitTheta,
                                                              t0phi,
                                                              t0theta);
         }
 
       }  // end of if (bestRecHit)
 
     }  // end of if (nsegm!= 0)
 
     // Fill Efficiency plot
     if (doall_) {
       HEff4DHit *heff = nullptr;
 
       if (wheel == 0) {
         heff = histograms.hEff_W0.get();
       } else if (abs(wheel) == 1) {
         heff = histograms.hEff_W1.get();
       } else if (abs(wheel) == 2) {
         heff = histograms.hEff_W2.get();
       }
       heff->fill(etaSimSeg, phiSimSeg, xSimSeg, ySimSeg, alphaSimSeg, betaSimSeg, recHitFound, count_seg);
       histograms.hEff_All->fill(
           etaSimSeg, phiSimSeg, xSimSeg, ySimSeg, alphaSimSeg, betaSimSeg, recHitFound, count_seg);
       if (local_) {
         histograms.hEffWS[abs(wheel)][station - 1]->fill(
             etaSimSeg, phiSimSeg, xSimSeg, ySimSeg, alphaSimSeg, betaSimSeg, recHitFound, count_seg);
       }
     }
   }  // End of loop over chambers
 }