Muon::STgcClusterBuilderCommon Class Reference

#include <STgcClusterBuilderCommon.h>

Inheritance diagram for Muon::STgcClusterBuilderCommon:

Collaboration diagram for Muon::STgcClusterBuilderCommon:

Public Member Functions
	STgcClusterBuilderCommon (const sTgcIdHelper &idHelper, const NswErrorCalibData &errorCalibData)
	Constructor. More...
std::array< std::vector< sTgcPrepData >, 8 >	sortSTGCPrdPerLayer (std::vector< sTgcPrepData > &&stripPrds) const
	Separate the sTGC PRDs by layer, from 0 to 7, and sort the PRDs per layer in ascending order of strip number. More...
std::vector< std::vector< sTgcPrepData > >	findStripCluster (std::vector< sTgcPrepData > &&strips, const int maxMissingStrip) const
	Find strip clusters, assuming the input vector of PRDs are sorted in ascending order of strip number. More...
std::optional< STgcClusterPosition >	weightedAverage (const std::vector< sTgcPrepData > &cluster, const double resolution, bool isStrip) const
	Compute the cluster position using the weighted average method. More...
std::optional< STgcClusterPosition >	caruanaGaussianFitting (const std::vector< sTgcPrepData > &cluster, const double positionResolution, const double angularResolution, const MuonGM::MuonDetectorManager *detManager) const
	Method to fit analytically a cluster to a Gaussian function to obtain the position of the cluster The method supports only strip clusters having at least 3 strips. More...
bool	msgLvl (const MSG::Level lvl) const
	Test the output level. More...
MsgStream &	msg () const
	The standard message stream. More...
MsgStream &	msg (const MSG::Level lvl) const
	The standard message stream. More...
void	setLevel (MSG::Level lvl)
	Change the current logging level. More...

Private Member Functions
void	initMessaging () const
	Initialize our message level and MessageSvc. More...

Private Attributes
const sTgcIdHelper &	m_stgcIdHelper
const NswErrorCalibData &	m_errorCalibData
std::string	m_nm
	Message source name. More...
boost::thread_specific_ptr< MsgStream >	m_msg_tls
	MsgStream instance (a std::cout like with print-out levels) More...
std::atomic< IMessageSvc * >	m_imsg { nullptr }
	MessageSvc pointer. More...
std::atomic< MSG::Level >	m_lvl { MSG::NIL }
	Current logging level. More...
std::atomic_flag m_initialized	ATLAS_THREAD_SAFE = ATOMIC_FLAG_INIT
	Messaging initialized (initMessaging) More...

Detailed Description

Definition at line 30 of file STgcClusterBuilderCommon.h.

Constructor & Destructor Documentation

STgcClusterBuilderCommon()

Muon::STgcClusterBuilderCommon::STgcClusterBuilderCommon	(	const sTgcIdHelper &	idHelper,
		const NswErrorCalibData &	errorCalibData
	)

Constructor.

Definition at line 10 of file STgcClusterBuilderCommon.cxx.

        : AthMessaging("STgcClusterBuilderCommon"),
          m_stgcIdHelper(idHelper),
          m_errorCalibData{errorCalibData}
{
}

Member Function Documentation

caruanaGaussianFitting()

std::optional< Muon::STgcClusterPosition > Muon::STgcClusterBuilderCommon::caruanaGaussianFitting	(	const std::vector< sTgcPrepData > &	cluster,
		const double	positionResolution,
		const double	angularResolution,
		const MuonGM::MuonDetectorManager *	detManager
	)		const

Method to fit analytically a cluster to a Gaussian function to obtain the position of the cluster The method supports only strip clusters having at least 3 strips.

A Gaussian function y(x) = A exp(-(x - \mu)^2 / (2 \sigma^2)) can be written as a quadratic function: ln(y(x)) = ln(A) - (x - \mu)^2 / (2 \sigma^2) = ln(A) - \mu^2 / (2 \sigma^2) - \mu x / \sigma^2 - x^2 / (2 \sigma^2) = a + b x + c x^2 where a = ln(A) - \mu^2 / (2 \sigma^2), b = -\mu / \sigma^2 and c = -1 / / (2 \sigma^2). Solving the equation, the mean position is \mu = -b / (2 c) and standard dev is \sigma = sqrt(-1 / (2 c)).

Parameters positionResolution and angularResolution enter in the estimate of the error on the mean position.

Definition at line 155 of file STgcClusterBuilderCommon.cxx.

{
 
  // Verify that there are 3 or more strips with non-zero charge, and the shape is not similar to a staircase
  std::vector<int> charges;
  charges.reserve(cluster.size());
  std::vector<double> stripPositions;
  stripPositions.reserve(cluster.size());
  bool isStairUp{true}, isStairDown{true};
  int multiplicity = 0;
  for (unsigned int j = 0; j < cluster.size(); ++j){
    int stripCharge = cluster.at(j).charge();
    if (stripCharge > 0) {
      multiplicity += 1;
      charges.push_back(stripCharge);
      stripPositions.push_back(cluster.at(j).localPosition().x());
 
      if (j > 0) {
        int prevStripCharge = cluster.at(j-1).charge();
        if (isStairUp && (stripCharge - prevStripCharge < 0))
          isStairUp = false;
        if (isStairDown && (prevStripCharge > 0) && (stripCharge - prevStripCharge > 0))
          isStairDown = false;
      }
    }
  }
 
  // Caruana fitting method doesn't support clusters having least than 3 strips or staircase-like clusters
  if (multiplicity < 3 || isStairUp || isStairDown) {
    if (msgLvl(MSG::VERBOSE)) {
      std::stringstream sstr{};
      for (const Muon::sTgcPrepData& prd : cluster) {
          sstr << m_stgcIdHelper.print_to_string(prd.identify())
               << ", local pos: ("<< prd.localPosition().x() << "," << prd.localPosition().y()
               << "), charge: " << prd.charge() << ", time: " << static_cast<int>(prd.time())
               << std::endl;
      }
      ATH_MSG_VERBOSE("Reject cluster incompatible with the Caruana method..." << std::endl << sstr.str());
    }
    return std::nullopt;
  }
 
  // Here we implement the Caruana method to reconstruct the position of the cluster
  AmgSymMatrix(3) elementPosMatrix;
  for (int i=0; i<3; i++) {
    for (int j=0; j<=i; j++) elementPosMatrix.fillSymmetric(i, j, 0);
  }
  Amg::Vector3D chargeVector(0., 0., 0.);
 
  // The reconstruction method becomes much simpiler when the strip positions are shifted such that 
  // the center of the cluster is at zero.
  float clusterCenter = 0;
  for (size_t i_strip = 0; i_strip < stripPositions.size(); i_strip++) {
    clusterCenter += stripPositions.at(i_strip);
  }
  clusterCenter = clusterCenter / stripPositions.size();
 
  std::vector<double> stripPositions_shifted = {};
  for (size_t i_strip = 0; i_strip < stripPositions.size(); i_strip++) {
    stripPositions_shifted.push_back(stripPositions.at(i_strip)-clusterCenter);
  }
 
  // Now build the matrix equation
  for (size_t i_element = 0; i_element < stripPositions_shifted.size(); i_element++) {
    elementPosMatrix.fillSymmetric(0, 0, elementPosMatrix(0,0) + 1);
    elementPosMatrix.fillSymmetric(0, 1, elementPosMatrix(0,1) + stripPositions_shifted.at(i_element));
    elementPosMatrix.fillSymmetric(0, 2, elementPosMatrix(0,2) + std::pow(stripPositions_shifted.at(i_element), 2));
    elementPosMatrix.fillSymmetric(1, 2, elementPosMatrix(1,2) + std::pow(stripPositions_shifted.at(i_element), 3));
    elementPosMatrix.fillSymmetric(2, 2, elementPosMatrix(2,2) + std::pow(stripPositions_shifted.at(i_element), 4));
    const double log_charge = std::log(charges.at(i_element));
    chargeVector(0) += log_charge;
    chargeVector(1) += stripPositions_shifted.at(i_element) * log_charge;
    chargeVector(2) += std::pow(stripPositions_shifted.at(i_element), 2) * log_charge;
  }
  elementPosMatrix(1,1) = elementPosMatrix(0,2);
 
  // If the matrix is singular then the reconstruction method will fail
  if (elementPosMatrix.determinant() == 0) {
    if (msgLvl(MSG::VERBOSE)) {
      std::stringstream sstr{};
      for (const Muon::sTgcPrepData& prd : cluster) {
          sstr << m_stgcIdHelper.print_to_string(prd.identify())
               << ", local pos: ("<< prd.localPosition().x() << "," << prd.localPosition().y()
               << "), charge: " << prd.charge() << ", time: " << static_cast<int>(prd.time())
               << std::endl;
      }
      ATH_MSG_VERBOSE("Failed to compute the position of the cluster..." << std::endl << sstr.str());
    }
    return std::nullopt;
  }
 
  // Solve the matrix equation to find the Caruana parameters
  Amg::Vector3D caruanaPars = (elementPosMatrix.inverse()) * chargeVector;
 
  // The 3rd parameter is related to the standard deviation: sigma = sqrt(-1 / (2 * caruanaPars(2))).
  // Hence use the Caruana method if the std dev is small i.e. < 3*strip_pitch or caruanaPars(2) > -0.005,
  // or if std dev is not physical i.e. caruanaPars(2) >= 0
  double reconstructedPosX{0.};
  if (caruanaPars(2) < -0.005) {
    reconstructedPosX = clusterCenter - caruanaPars(1) / (2*caruanaPars(2));
  } else { 
    if (msgLvl(MSG::VERBOSE)) {
      std::stringstream sstr{};
      for (const Muon::sTgcPrepData& prd : cluster) {
          sstr << m_stgcIdHelper.print_to_string(prd.identify())
               << ", local pos: ("<< prd.localPosition().x() << "," << prd.localPosition().y()
               << "), charge: " << prd.charge() << ", time: " << static_cast<int>(prd.time())
               << std::endl;
      }
      ATH_MSG_VERBOSE("Reject cluster with large standard deviation..." << std::endl << sstr.str());
    }
    return std::nullopt;
  }
 
  // Find the channel that the cluster position reconstructs on top of and set the cluster id to its id
  double minCenterDistance = 9999.99;
  int channelIndex = 0;
  for (size_t i_elem = 0; i_elem < cluster.size(); i_elem++) {
    double strip_localPos = cluster.at(i_elem).localPosition().x();
    if (minCenterDistance > abs(strip_localPos - reconstructedPosX)) {
      minCenterDistance = abs(strip_localPos - reconstructedPosX);
      channelIndex = i_elem;
    }
  }
  const Identifier clusterId = cluster.at(channelIndex).identify();
 
  // Get the sTGC readoutElement and the strip pitch
  const MuonGM::sTgcReadoutElement* detEl = detManager->getsTgcReadoutElement(clusterId);
  const double stripPitch = detEl->channelPitch(clusterId);
 
  // If the reconstructed cluster position is far, such as one strip pitch, from any strip position in the cluster,
  // then the Caruana reconstruction method isn't a good method to use.
  if (minCenterDistance > stripPitch) {
    if (msgLvl(MSG::VERBOSE)) {
      std::stringstream sstr{};
      for (const Muon::sTgcPrepData& prd : cluster) {
          sstr << m_stgcIdHelper.print_to_string(prd.identify())
               << ", local pos: ("<< prd.localPosition().x() << "," << prd.localPosition().y()
               << "), charge: " << prd.charge() << ", time: " << static_cast<int>(prd.time())
               << std::endl;
      }
      ATH_MSG_VERBOSE("Reject cluster since its position is more than " << stripPitch << " mm too far from the nearest strip..." 
                      << std::endl << sstr.str());
    }
    return std::nullopt;
  }
 
  // We denote caruanaPars = (a, b, c) and find the error on the b and c components
  double gamma0 = 0;
  double gamma2 = 0;
  double gamma4 = 0;
  for (size_t i_strip = 0; i_strip < stripPositions_shifted.size(); i_strip++) {
    gamma0 += 1;
    gamma2 += std::pow(stripPositions_shifted.at(i_strip), 2);
    gamma4 += std::pow(stripPositions_shifted.at(i_strip), 4);
  }
 
  // We also need the tan(theta) of the cluster
  Amg::Vector3D globPos(0., 0., 0.);
  detEl->stripGlobalPosition(clusterId, globPos);
  double tan_theta = std::hypot(globPos.x(),  globPos.y()) / globPos.z();
  double spreadFactor = std::hypot(positionResolution, angularResolution * tan_theta);
 
  double sigma_b = spreadFactor / std::sqrt(gamma2);
  double sigma_c = spreadFactor * std::sqrt(gamma0 / (gamma0 * gamma4 - gamma2 * gamma2));
 
  // Now propagate the Uncertainty to find the uncertainty on the mean
  double sigmaSq = std::pow((1 / (2 * caruanaPars(2))) * sigma_b, 2) +
                   std::pow((caruanaPars(1) / (2 * caruanaPars(2) * caruanaPars(2))) * sigma_c, 2);
 
  // Caruana method fails, if the uncertainty on the mean position is too large such as greater than 2mm
  if (sigmaSq > 4) {
    if (msgLvl(MSG::VERBOSE)) {
      std::stringstream sstr{};
      for (const Muon::sTgcPrepData& prd : cluster) {
          sstr << m_stgcIdHelper.print_to_string(prd.identify())
               << ", local pos: ("<< prd.localPosition().x() << "," << prd.localPosition().y()
               << "), charge: " << prd.charge() << ", time: " << static_cast<int>(prd.time())
               << std::endl;
      }
      ATH_MSG_VERBOSE("Reject cluster with large error on the mean position..." << std::endl << sstr.str());
    }
    return std::nullopt;
  }
  
  
  Amg::Vector3D globalClusterPos {detEl->surface(clusterId).transform()*Amg::Vector3D{reconstructedPosX, 0,0}}; 
  Amg::Vector3D clusDir{ NswClustering::toLocal(detEl->surface(clusterId), globalClusterPos) };
  
  NswErrorCalibData::Input errorCalibIn{};
  errorCalibIn.stripId = clusterId;
  errorCalibIn.clusterAuthor = static_cast<unsigned>(sTgcPrepData::Author::Caruana);
  errorCalibIn.clusterError = std::sqrt(sigmaSq); 
  errorCalibIn.locPhi = clusDir.phi();
  errorCalibIn.locTheta = clusDir.theta();
  errorCalibIn.localPos = Amg::Vector2D{reconstructedPosX, 0};
  errorCalibIn.clusterSize = cluster.size();
 
  const double localUncertainty = m_errorCalibData.clusterUncertainty(errorCalibIn);
 
  ATH_MSG_DEBUG("Reconstructed a cluster using the Caruana method,"
                 << " cluster Id: " << m_stgcIdHelper.print_to_string(clusterId)
                 << ", mean position = " << reconstructedPosX
                 << ", uncertainty = " << std::sqrt(sigmaSq));
 
  return std::make_optional<Muon::STgcClusterPosition>(clusterId, reconstructedPosX, localUncertainty*localUncertainty);
}

findStripCluster()

std::vector< std::vector< Muon::sTgcPrepData > > Muon::STgcClusterBuilderCommon::findStripCluster	(	std::vector< sTgcPrepData > &&	strips,
		const int	maxMissingStrip
	)		const

Find strip clusters, assuming the input vector of PRDs are sorted in ascending order of strip number.

Definition at line 44 of file STgcClusterBuilderCommon.cxx.

                                                                                                                               {
  std::vector<std::vector<Muon::sTgcPrepData>> clusters;
 
  if (strips.empty()) return clusters;
 
  // Get the Id of the first strip to verify all the strips are from the same layer
  const Identifier& firstStripId = strips.front().identify();
 
  for (Muon::sTgcPrepData& prd : strips) {
    // If no element has been added to the vector of clusters yet
    if (clusters.empty()) {
      clusters.emplace_back();
      clusters.back().push_back(std::move(prd));
      continue;
    }
 
    const Identifier prd_id = prd.identify();
    if (m_stgcIdHelper.multilayerID(firstStripId) != m_stgcIdHelper.multilayerID(prd_id) ||
        m_stgcIdHelper.gasGap(firstStripId) != m_stgcIdHelper.gasGap(prd_id) ||
        m_stgcIdHelper.channelType(firstStripId) != m_stgcIdHelper.channelType(prd_id)) {
      ATH_MSG_WARNING("Strips must be separated by layer before attempting to build clusters,"
                       << " but found strips from different chambers");
      continue;
    }
 
    // Add another strip to a  vector of clusters
    if (std::abs(m_stgcIdHelper.channel(prd.identify()) - 
                 m_stgcIdHelper.channel(clusters.back().back().identify())) > maxMissingStrip + 1) {
      clusters.emplace_back();
    }
    clusters.back().push_back(std::move(prd));   
  }
 
  return clusters;
}

initMessaging()

void AthMessaging::initMessaging ( ) const

privateinherited

Initialize our message level and MessageSvc.

This method should only be called once.

Definition at line 39 of file AthMessaging.cxx.

{
  m_imsg = Athena::getMessageSvc();
  m_lvl = m_imsg ?
    static_cast<MSG::Level>( m_imsg.load()->outputLevel(m_nm) ) :
    MSG::INFO;
}

msg() [1/2]

MsgStream & AthMessaging::msg ( ) const

inlineinherited

The standard message stream.

Returns a reference to the default message stream May not be invoked before sysInitialize() has been invoked.

Definition at line 164 of file AthMessaging.h.

{
  MsgStream* ms = m_msg_tls.get();
  if (!ms) {
    if (!m_initialized.test_and_set()) initMessaging();
    ms = new MsgStream(m_imsg,m_nm);
    m_msg_tls.reset( ms );
  }
 
  ms->setLevel (m_lvl);
  return *ms;
}

msg() [2/2]

MsgStream & AthMessaging::msg ( const MSG::Level  lvl ) const

inlineinherited

The standard message stream.

Returns a reference to the default message stream May not be invoked before sysInitialize() has been invoked.

Definition at line 179 of file AthMessaging.h.

{ return msg() << lvl; }

msgLvl()

bool AthMessaging::msgLvl ( const MSG::Level  lvl ) const

inlineinherited

Test the output level.

Parameters

lvl	The message level to test against

Returns

boolean Indicating if messages at given level will be printed

Return values

true	Messages at level "lvl" will be printed

Definition at line 151 of file AthMessaging.h.

{
  if (!m_initialized.test_and_set()) initMessaging();
  if (m_lvl <= lvl) {
    msg() << lvl;
    return true;
  } else {
    return false;
  }
}

setLevel()

void AthMessaging::setLevel ( MSG::Level  lvl )

inherited

Change the current logging level.

Use this rather than msg().setLevel() for proper operation with MT.

Definition at line 28 of file AthMessaging.cxx.

{
  m_lvl = lvl;
}

sortSTGCPrdPerLayer()

std::array< std::vector< Muon::sTgcPrepData >, 8 > Muon::STgcClusterBuilderCommon::sortSTGCPrdPerLayer

(

std::vector< sTgcPrepData > &&

stripPrds

)

const

Separate the sTGC PRDs by layer, from 0 to 7, and sort the PRDs per layer in ascending order of strip number.

Definition at line 20 of file STgcClusterBuilderCommon.cxx.

                                                                                               {
 
    
    std::array<std::vector<Muon::sTgcPrepData>, 8> stgcPrdsPerLayer;
    for (Muon::sTgcPrepData& prd : stripPrds) {
      const Identifier id = prd.identify();
      int layer = 4 * (m_stgcIdHelper.multilayer(id) - 1) + (m_stgcIdHelper.gasGap(id) - 1);
      ATH_MSG_DEBUG("Sorting PRD into layer, layer: " << layer << " gas_gap: " << m_stgcIdHelper.gasGap(id)
                    << "multilayer: " << m_stgcIdHelper.multilayer(id));
      stgcPrdsPerLayer.at(layer).push_back(std::move(prd));
    }
    
    // sort prds by channel
    for (unsigned int i_layer = 0; i_layer < stgcPrdsPerLayer.size(); i_layer++) {
      std::sort(stgcPrdsPerLayer.at(i_layer).begin(), stgcPrdsPerLayer.at(i_layer).end(),
                [this](const sTgcPrepData& a, const sTgcPrepData& b) {
                  return m_stgcIdHelper.channel(a.identify()) < m_stgcIdHelper.channel(b.identify());
                });
    }  
    return stgcPrdsPerLayer;
}

weightedAverage()

std::optional< Muon::STgcClusterPosition > Muon::STgcClusterBuilderCommon::weightedAverage	(	const std::vector< sTgcPrepData > &	cluster,
		const double	resolution,
		bool	isStrip
	)		const

Compute the cluster position using the weighted average method.

Definition at line 83 of file STgcClusterBuilderCommon.cxx.

{
 
  if (cluster.empty()) {
    ATH_MSG_VERBOSE("Skipping empty cluster");
    return std::nullopt;
  }
 
  double weightedPosX{0.0}, maxCharge{-1.0}, sumWeight{0.0}, sigmaSq{0.0};
  Identifier clusterId;
  Amg::Vector3D clusDir{Amg::Vector3D::Zero()};
 
  ATH_MSG_DEBUG("Running weighted average method on a cluster with " << cluster.size() << " strips");
  for (const Muon::sTgcPrepData& prd : cluster) {
      // Skip channel if its charge is negative
      if (prd.charge() < 0) continue;
 
      double weight = isStrip ? prd.charge() : 1.0;
      ATH_MSG_DEBUG("isStrip: " << isStrip << " weight: " << weight);
 
      weightedPosX += prd.localPosition().x()*weight;
      sumWeight    += weight;
      sigmaSq      += weight*weight*resolution*resolution;
      clusDir += weight * NswClustering::toLocal(prd);
      ATH_MSG_DEBUG("Channel local position and charge: " << prd.localPosition().x() << " " << prd.charge() );
 
      // Set the cluster identifier to the max charge strip
      if (!isStrip) {
          clusterId = prd.identify();
      } else if (prd.charge() > maxCharge) {
          maxCharge = prd.charge();
          clusterId = prd.identify();
      }
  }
 
  // Charge in PRD is an integer, so the sum of weights should be greater than 1 unless the data is corrupted.
  // Skip corrupted cluster
  if (sumWeight < 1) {
    ATH_MSG_VERBOSE("Got unexpected sum of weights: " << sumWeight);
    return std::nullopt;
  }
 
  // Mean position of the cluster
  double reconstructedPosX = weightedPosX / sumWeight;
  sigmaSq /= sumWeight;
 
  NswErrorCalibData::Input errorCalibIn{};
  errorCalibIn.stripId = clusterId;
  errorCalibIn.clusterAuthor = static_cast<unsigned>(sTgcPrepData::Author::SimpleClusterBuilder);
  errorCalibIn.locPhi = clusDir.phi();
  errorCalibIn.locTheta = clusDir.theta();
  errorCalibIn.localPos = Amg::Vector2D{reconstructedPosX, 0};
  errorCalibIn.clusterSize = cluster.size();
 
  const double localUncertainty = m_errorCalibData.clusterUncertainty(errorCalibIn);
 
  ATH_MSG_VERBOSE("Reconstructed a cluster using the weighted average,"
                 << " cluster Id: " << m_stgcIdHelper.print_to_string(clusterId)
                 <<", direction: "<<Amg::toString(clusDir.unit())
                 <<", theta: "<<clusDir.theta() / Gaudi::Units::deg
                 << ", mean position = " << reconstructedPosX
                 << ", uncertainty = " << localUncertainty
                 <<", sigmaSQ: "<<sigmaSq);
 
  return std::make_optional<Muon::STgcClusterPosition>(clusterId, reconstructedPosX, localUncertainty*localUncertainty);
}

Member Data Documentation

ATLAS_THREAD_SAFE

std::atomic_flag m_initialized AthMessaging::ATLAS_THREAD_SAFE = ATOMIC_FLAG_INIT

mutableprivateinherited

Messaging initialized (initMessaging)

Definition at line 141 of file AthMessaging.h.

m_errorCalibData

const NswErrorCalibData& Muon::STgcClusterBuilderCommon::m_errorCalibData

private

Definition at line 64 of file STgcClusterBuilderCommon.h.

m_imsg

std::atomic<IMessageSvc*> AthMessaging::m_imsg { nullptr }

mutableprivateinherited

MessageSvc pointer.

Definition at line 135 of file AthMessaging.h.

m_lvl

std::atomic<MSG::Level> AthMessaging::m_lvl { MSG::NIL }

mutableprivateinherited

Current logging level.

Definition at line 138 of file AthMessaging.h.

m_msg_tls

boost::thread_specific_ptr<MsgStream> AthMessaging::m_msg_tls

mutableprivateinherited

MsgStream instance (a std::cout like with print-out levels)

Definition at line 132 of file AthMessaging.h.

m_nm

std::string AthMessaging::m_nm

privateinherited

Message source name.

Definition at line 129 of file AthMessaging.h.

m_stgcIdHelper

const sTgcIdHelper& Muon::STgcClusterBuilderCommon::m_stgcIdHelper

private

Definition at line 63 of file STgcClusterBuilderCommon.h.

---

The documentation for this class was generated from the following files:

• STgcClusterBuilderCommon.h
• STgcClusterBuilderCommon.cxx