Trk::EnergyLossUpdator Class Reference

The mean Energy loss per unit length of a particle is calculated as. More...

#include <EnergyLossUpdator.h>

Inheritance diagram for Trk::EnergyLossUpdator:

Collaboration diagram for Trk::EnergyLossUpdator:

Public Member Functions
	EnergyLossUpdator (const std::string &, const std::string &, const IInterface *)
	AlgTool like constructor.
virtual	~EnergyLossUpdator ()=default
	Virtual destructor.
virtual double	dEdX (const MaterialProperties &mat, double p, ParticleHypothesis particle=pion) const override final
	dEdX calculation when providing MaterialProperties, a momentum, a pathlength, and a ParicleHypothesis:
virtual EnergyLoss	energyLoss (const MaterialProperties &mat, double p, double pathcorrection, PropDirection dir=alongMomentum, ParticleHypothesis particle=pion, bool useMPV=false) const override final
	deltaE calculation using dEdX and integrating along pathlength, assuming constant dEdX during for the path.
virtual EnergyLoss	updateEnergyLoss (EnergyLoss &eLoss, double caloEnergy, double caloEnergyError, double pCaloEntry, double momentumError, int &elossFlag) const override final
	Method to recalculate Eloss values for the fit setting an elossFlag using as an input the detailed Eloss information Calorimeter energy, error momentum and momentum error.
virtual void	getX0ElossScales (int icalo, double eta, double phi, double &X0Scale, double &ElossScale) const override final
	Routine to calculate X0 and Eloss scale factors for the Calorimeter and Muon System.
ServiceHandle< StoreGateSvc > &	evtStore ()
	The standard StoreGateSvc (event store) Returns (kind of) a pointer to the StoreGateSvc.
const ServiceHandle< StoreGateSvc > &	detStore () const
	The standard StoreGateSvc/DetectorStore Returns (kind of) a pointer to the StoreGateSvc.
virtual StatusCode	sysInitialize () override
	Perform system initialization for an algorithm.
virtual StatusCode	sysStart () override
	Handle START transition.
virtual std::vector< Gaudi::DataHandle * >	inputHandles () const override
	Return this algorithm's input handles.
virtual std::vector< Gaudi::DataHandle * >	outputHandles () const override
	Return this algorithm's output handles.
Gaudi::Details::PropertyBase &	declareProperty (Gaudi::Property< T, V, H > &t)
void	updateVHKA (Gaudi::Details::PropertyBase &)
MsgStream &	msg () const
bool	msgLvl (const MSG::Level lvl) const
	DeclareInterfaceID (IEnergyLossUpdator, 1, 0)
	Creates the InterfaceID and interfaceID() method.
virtual void	validationAction () const
	Validation Action: Can be implemented optionally, outside access to internal validation steps.

Protected Member Functions
void	renounceArray (SG::VarHandleKeyArray &handlesArray)
	remove all handles from I/O resolution
std::enable_if_t< std::is_void_v< std::result_of_t< decltype(&T::renounce)(T)> > &&!std::is_base_of_v< SG::VarHandleKeyArray, T > &&std::is_base_of_v< Gaudi::DataHandle, T >, void >	renounce (T &h)
void	extraDeps_update_handler (Gaudi::Details::PropertyBase &ExtraDeps)
	Add StoreName to extra input/output deps as needed.

Private Types
typedef ServiceHandle< StoreGateSvc >	StoreGateSvc_t

Private Member Functions
double	varianceDeltaQoverP (const MaterialProperties &, double p, double pathcorrection, PropDirection direction=alongMomentum, ParticleHypothesis particleHypothesis=electron) const
	Method to return the variance of the change in q/p for the Bethe-Heitler parameterisation.
Trk::EnergyLoss	ionizationEnergyLoss (const MaterialProperties &mat, double p, double pathcorrection, PropDirection dir=alongMomentum, ParticleHypothesis particle=pion) const
Gaudi::Details::PropertyBase &	declareGaudiProperty (Gaudi::Property< T, V, H > &hndl, const SG::VarHandleKeyType &)
	specialization for handling Gaudi::Property<SG::VarHandleKey>

Private Attributes
BooleanProperty	m_detailedEloss
BooleanProperty	m_optimalRadiation
StoreGateSvc_t	m_evtStore
	Pointer to StoreGate (event store by default)
StoreGateSvc_t	m_detStore
	Pointer to StoreGate (detector store by default)
std::vector< SG::VarHandleKeyArray * >	m_vhka
bool	m_varHandleArraysDeclared

Detailed Description

The mean Energy loss per unit length of a particle is calculated as.

\( (dE/dx) = (dE/dX)_{io} + (dE/dX)_{rad} \)

Formulas used:

• For the ionization : Bethe-Bloch for minimum ionizing particles (modified for electrons)

\( (dE/dX)_{io,mip} = K \cdot \frac{Z}{A} \frac{1/\beta^2} \cdot [\frac{1}{2}] \cdot \ln \frac{2 m_e c^2 \beta^2 \gamma^2 T_max}{I^2} - \beta^2] \), (1)

respectively

@f$ (dE/dX)_{io,e}  = \frac{1/2} \cdot K \cdot \frac{Z}{A}
[2\ln\frac{2m_e c^2}{I} + 3 \ln{\gamma} - 1.95] @f$ (2)

Alternatively, the most probable value instead of the mean value can be

taken (steared by boolean in the method signature), taken from (4)

 @f$ \_{L}\Delta_p = \xi \left[ln\frac{2mc^2\beta^2\gamma^2}{I} +

ln\frac{\xi}{I} - 0.8 + 4.447 \right] \( with \) \xi = Z N_a \frac{k}{\beta^2}\codt t \( The with of both distributions is given as the (crude) approximation, that the full width at half maximum of the landau distribution is : \) 4 \xi \( For the transformation into a parameterized sigma the factor \) 2\cdot\sqrt{2.\cdot ln(2.) } \( can be used Sigma can be multiplied by a form factor (given through job options) - <b>For radiation corrections: </b> The Bethe-Heitler parameterisation is in terms of \) Z = \frac{E_f}{E_i} \( (2) With this parameterisation the expected energy loss \) \langle Z \rangle = e^{-t} \( (2) where \) t = \frac{x}{X_0} \( or the fraction of a radiation length of material traversed by the particle. This formula can be transposed in terms of \) \Delta (E) \(. The transposition however depends on the direction of propagation. For forwards propagation we get: \) \langle \Delta (E) \rangle = E_i ( 1 - \langle Z \rangle ) \( (2) For the propagation against momentum we get: \) \langle \Delta (E) \rangle = E_i ( \frac{1}{\langle Z \rangle} - 1 ) \( (2) The variance of Z is also defined (2): \) Var(Z) = e^{-t ln(3) / ln(2)} - e^{-2t} \( Transposing this one dervies the following relations for 1. Forwards propagation \) Var ( \Delta \frac{q}{p} ) = \frac{Var(Z)}{\langle Z \rangle ^2 p^2} \( 2. Backwards propagation \) Var ( \Delta \frac{q}{p} ) = \frac{Var(Z)}{p^2} \( Where p is the global momentum. Bethe-Heitler formula \) (dE/dX)_{rad} = \frac{E_{initial}}{X_o}\cdot (\frac{m}{m_e})^2

Definition at line 113 of file EnergyLossUpdator.h.

Member Typedef Documentation

StoreGateSvc_t

typedef ServiceHandle<StoreGateSvc> AthCommonDataStore< AthCommonMsg< AlgTool > >::StoreGateSvc_t

privateinherited

Definition at line 388 of file AthCommonDataStore.h.

Constructor & Destructor Documentation

EnergyLossUpdator()

Trk::EnergyLossUpdator::EnergyLossUpdator	(	const std::string &	t,
		const std::string &	n,
		const IInterface *	p )

AlgTool like constructor.

Definition at line 22 of file EnergyLossUpdator.cxx.

  : AthAlgTool(t, n, p)
{
  declareInterface<Trk::IEnergyLossUpdator>(this);
}

~EnergyLossUpdator()

virtual Trk::EnergyLossUpdator::~EnergyLossUpdator ( )

virtualdefault

Virtual destructor.

Member Function Documentation

declareGaudiProperty()

Gaudi::Details::PropertyBase & AthCommonDataStore< AthCommonMsg< AlgTool > >::declareGaudiProperty ( Gaudi::Property< T, V, H > & hndl, const SG::VarHandleKeyType &  )

inlineprivateinherited

specialization for handling Gaudi::Property<SG::VarHandleKey>

Definition at line 156 of file AthCommonDataStore.h.

  {
    return *AthCommonDataStore<PBASE>::declareProperty(hndl.name(),
                                                       hndl.value(), 
                                                       hndl.documentation());
 
  }

DeclareInterfaceID()

Trk::IEnergyLossUpdator::DeclareInterfaceID ( IEnergyLossUpdator , 1 , 0  )

inherited

Creates the InterfaceID and interfaceID() method.

declareProperty()

Gaudi::Details::PropertyBase & AthCommonDataStore< AthCommonMsg< AlgTool > >::declareProperty ( Gaudi::Property< T, V, H > & t )

inlineinherited

Definition at line 145 of file AthCommonDataStore.h.

                                                                     {
    typedef typename SG::HandleClassifier<T>::type htype;
    return AthCommonDataStore<PBASE>::declareGaudiProperty(t, htype());
  }

dEdX()

double Trk::EnergyLossUpdator::dEdX ( const MaterialProperties & mat, double p, ParticleHypothesis particle = pion ) const

finaloverridevirtual

dEdX calculation when providing MaterialProperties, a momentum, a pathlength, and a ParicleHypothesis:

Units: [MeV/mm]

Implements Trk::IEnergyLossUpdator.

Definition at line 32 of file EnergyLossUpdator.cxx.

{
  if (particle == Trk::undefined || particle == Trk::nonInteracting) {
    return 0.;
  }
 
  // preparation of kinetic constants
  double m = Trk::ParticleMasses::mass[particle];
  double E = std::sqrt(p * p + m * m);
  double beta = p / E;
  double gamma = E / m;
 
  // add ionization and radiation
  double dEdX =
    Trk::MaterialInteraction::dEdXBetheBloch(mat, beta, gamma, particle) +
    Trk::MaterialInteraction::dEdXBetheHeitler(mat, E, particle);
 
  // add e+e- pair production and photonuclear effect for muons at energies
  // above 8 GeV
  if ((particle == Trk::muon) && (E > 8000.)) {
    if (E < 1.e6) {
      dEdX += -0.5345 / mat.x0() + 6.803e-5 * E / mat.x0() +
              2.278e-11 * E * E / mat.x0() -
              9.899e-18 * E * E * E / mat.x0(); // E below 1 TeV
    } else {
      dEdX += -2.986 / mat.x0() + 9.253e-5 * E / mat.x0(); // E above 1 TeV
    }
  }
  return dEdX;
}

detStore()

const ServiceHandle< StoreGateSvc > & AthCommonDataStore< AthCommonMsg< AlgTool > >::detStore ( ) const

inlineinherited

The standard StoreGateSvc/DetectorStore Returns (kind of) a pointer to the StoreGateSvc.

Definition at line 95 of file AthCommonDataStore.h.

{ return m_detStore; }

energyLoss()

Trk::EnergyLoss Trk::EnergyLossUpdator::energyLoss ( const MaterialProperties & mat, double p, double pathcorrection, PropDirection dir = alongMomentum, ParticleHypothesis particle = pion, bool useMPV = false ) const

finaloverridevirtual

deltaE calculation using dEdX and integrating along pathlength, assuming constant dEdX during for the path.

The sign depends on the given propagation direction

Units: [MeV]

mpv steers the most probable energy loss

Implements Trk::IEnergyLossUpdator.

Definition at line 67 of file EnergyLossUpdator.cxx.

{
  if (particle == Trk::undefined) {
    ATH_MSG_WARNING(
      "undefined ParticleHypothesis, energy loss calculation cancelled");
    return {};
  }
 
  if (useMPV) {
    return ionizationEnergyLoss(mat, p, pathcorrection, dir, particle);
  }
 
  double deltaE = 0.;
  // preparation
  double sign = (dir == Trk::oppositeMomentum) ? -1. : 1.;
 
  double pathLength = pathcorrection * mat.thicknessInX0() * mat.x0();
 
  double sigIoni = 0.;
  double sigRad = 0.;
  double kazL = 0.;
  double meanIoni = Trk::MaterialInteraction::dEdl_ionization(
    p, (mat.material()), particle, sigIoni, kazL);
  double meanRad = Trk::MaterialInteraction::dEdl_radiation(
    p, (mat.material()), particle, sigRad);
 
  meanIoni = sign * pathLength * meanIoni;
  meanRad = sign * pathLength * meanRad;
  sigIoni = pathLength * sigIoni;
  sigRad = pathLength * sigRad;
  kazL = pathLength * kazL;
 
  //
  // include pathlength dependence of Landau ionization
  //
  sigIoni = sigIoni - kazL * std::log(pathLength);
 
  deltaE = meanIoni + meanRad;
 
  double sigmaDeltaE = std::sqrt(sigIoni * sigIoni + sigRad * sigRad);
  ATH_MSG_DEBUG(" Energy loss updator deltaE "
                << deltaE << " meanIoni " << meanIoni << " meanRad " << meanRad
                << " sigIoni " << sigIoni << " sigRad " << sigRad << " sign "
                << sign << " pathLength " << pathLength);
  return (!m_detailedEloss ? Trk::EnergyLoss(deltaE, sigmaDeltaE)
                           : Trk::EnergyLoss(deltaE, sigmaDeltaE, sigmaDeltaE,
                                             sigmaDeltaE, meanIoni, sigIoni,
                                             meanRad, sigRad, pathLength));
}

evtStore()

ServiceHandle< StoreGateSvc > & AthCommonDataStore< AthCommonMsg< AlgTool > >::evtStore ( )

inlineinherited

The standard StoreGateSvc (event store) Returns (kind of) a pointer to the StoreGateSvc.

Definition at line 85 of file AthCommonDataStore.h.

{ return m_evtStore; }

extraDeps_update_handler()

void AthCommonDataStore< AthCommonMsg< AlgTool > >::extraDeps_update_handler ( Gaudi::Details::PropertyBase & ExtraDeps )

protectedinherited

Add StoreName to extra input/output deps as needed.

use the logic of the VarHandleKey to parse the DataObjID keys supplied via the ExtraInputs and ExtraOuputs Properties to add the StoreName if it's not explicitly given

getX0ElossScales()

void Trk::EnergyLossUpdator::getX0ElossScales ( int icalo, double eta, double phi, double & X0Scale, double & ElossScale ) const

finaloverridevirtual

Routine to calculate X0 and Eloss scale factors for the Calorimeter and Muon System.

Implements Trk::IEnergyLossUpdator.

Definition at line 310 of file EnergyLossUpdator.cxx.

{
  //
  // for Calorimeter icalo = 1
  //     Muon System icalo = 0
  // convention eta, phi is at Calorimeter Exit (or Muon Entry)
  //            eta and phi are from the position (not direction)
  //
  // input   X0 and ElossScale = 1
  // output  updated X0Scale and ElossScale
  //
 
  double X0CaloGirder[4] = {
    -1.02877e-01, -2.74322e-02, 8.12989e-02, 9.73551e-01
  };
 
  // R2012 to R2015 determined on ATLAS-R2-2015-03-01-00 to be used in rel 21
  constexpr double X0CaloScale[60] = {
    1.01685,  1.02092,  1.01875,  1.01812,  1.01791,  1.01345,  1.01354,
    1.02145,  1.01645,  1.01585,  1.0172,   1.02262,  1.01464,  0.990931,
    0.971953, 0.99845,  1.01433,  0.982143, 0.974015, 0.978742, 0.960029,
    0.966766, 0.980199, 0.989586, 0.997144, 1.00169,  0.994166, 0.966332,
    0.93671,  0.935656, 0.921994, 0.901489, 0.897799, 0.89638,  0.905629,
    0.903374, 0.925922, 0.941203, 0.956273, 0.968618, 0.976883, 0.988349,
    0.99855,  1.00212,  1.01456,  1.01541,  1.02532,  1.03238,  1.03688,
    1.03783,  1.02078,  1.01529,  1.0156,   1.02212,  1.02226,  1.02406,
    1.02188,  1.00661,  1.00661,  1.00661
  };
 
  // R2012 to R2015 determined on ATLAS-R2-2015-03-01-00 to be used in rel 21
  constexpr double ElossCaloScale[30] = {
    1.06921, 1.06828, 1.06734, 1.06092, 1.06638, 1.06335, 1.07421, 1.05885,
    1.07351, 1.07435, 1.06902, 1.07704, 1.08782, 1.09844, 1.115,   1.07609,
    1.08233, 1.08764, 1.08209, 1.08255, 1.08008, 1.07573, 1.077,   1.07271,
    1.07343, 1.07769, 1.07794, 1.08377, 1.08377, 1.08377
  };
 
  //
  constexpr double X0MuonScale[60] = {
    -0.0320612, -0.0320612, -0.0320612, -0.0320612,  -0.0693796,  -0.0389677,
    -0.0860891, -0.124606,  -0.0882329, -0.100014,   -0.0790912,  -0.0745538,
    -0.099088,  -0.0933711, -0.0618782, -0.0619762,  -0.0658361,  -0.109704,
    -0.129547,  -0.143364,  -0.0774768, -0.0739859,  -0.0417835,  -0.022119,
    0.00308797, 0.0197657,  -0.0137871, -0.036848,   -0.0643794,  -0.0514949,
    -0.0317105, 0.016539,   0.0308435,  -0.00056883, -0.00756813, -0.00760612,
    -0.0234571, -0.0980915, -0.101175,  -0.102354,   -0.0920337,  -0.100337,
    -0.0887628, 0.0660931,  0.228999,   0.260675,    0.266301,    0.267907,
    0.281668,   0.194433,   0.132954,   0.20707,     0.220466,    0.20936,
    0.191441,   0.191441,   0.191441,   0.191441,    0.191441,    0.191441
  };
 
  int i60 = std::abs(eta) * 20.;
 
  if (i60 < 0) {
    i60 = 0;
  }
  if (i60 > 59) {
    i60 = 59;
  }
 
  if (icalo == 1) {
    //
    // Girder parametrization
    //
    double x =
      phi + 3.1416 - 3.1416 / 32. * int((3.1416 + phi) / (3.1416 / 32.));
    double scale = 0.;
    if (x > M_PI / 64.) {
      x = M_PI / 32. - x;
    }
 
    if (x < 0.005) {
      scale =
        X0CaloGirder[0] * (1 - x / 0.005) + X0CaloGirder[1] + X0CaloGirder[3];
    } else if (x < 0.017) {
      scale = X0CaloGirder[1] + X0CaloGirder[3];
    } else if (x < 0.028) {
      scale = X0CaloGirder[2] + X0CaloGirder[3];
    } else {
      scale = X0CaloGirder[3];
    }
 
    if (std::abs(eta) > 1.3) {
      scale = 1.;
    }
    //
    // eta dependence of X0
    //
    scale *= X0CaloScale[i60];
    X0Scale = scale;
    //
    // eta dependence of Eloss
    //
    int i30 = std::abs(eta) * 10.;
    if (i30 < 0) {
      i30 = 0;
    }
    if (i30 > 29) {
      i30 = 29;
    }
 
    double nfactor = 0.987363 / 1.05471;
 
    ElossScale = nfactor * ElossCaloScale[i30] * scale;
  } else {
    //
    // Muon system
    //
    // eta dependence of X0
    //
    double scale = 1. + X0MuonScale[i60];
    //
    // Muon scale is now 1 with MuonTrackingGeometry and TrkDetDescrGeoModelCnv
    // fixes
    //
    scale = 1.0;
    X0Scale = scale;
    ElossScale = 0.93 * scale;
  }
}

inputHandles()

virtual std::vector< Gaudi::DataHandle * > AthCommonDataStore< AthCommonMsg< AlgTool > >::inputHandles ( ) const

overridevirtualinherited

Return this algorithm's input handles.

We override this to include handle instances from key arrays if they have not yet been declared. See comments on updateVHKA.

ionizationEnergyLoss()

Trk::EnergyLoss Trk::EnergyLossUpdator::ionizationEnergyLoss ( const MaterialProperties & mat, double p, double pathcorrection, PropDirection dir = alongMomentum, ParticleHypothesis particle = pion ) const

private

Definition at line 436 of file EnergyLossUpdator.cxx.

{
  // preparation
  double sign = (dir == Trk::oppositeMomentum) ? -1. : 1.;
  double pathLength = pathcorrection * mat.thicknessInX0() * mat.x0();
 
  double sigIoni = 0.;
  double kazL = 0.;
 
  double meanIoni =
    sign * Trk::MaterialInteraction::dE_MPV_ionization(
             p, (mat.material()), particle, sigIoni, kazL, pathLength);
 
  return (!m_detailedEloss
            ? Trk::EnergyLoss(meanIoni, sigIoni)
            : Trk::EnergyLoss(meanIoni,
                              sigIoni,
                              sigIoni,
                              sigIoni,
                              meanIoni,
                              sigIoni,
                              0.,
                              0.,
                              pathLength));
}

msg()

MsgStream & AthCommonMsg< AlgTool >::msg ( ) const

inlineinherited

Definition at line 24 of file AthCommonMsg.h.

                                {
    return this->msgStream();
  }

msgLvl()

bool AthCommonMsg< AlgTool >::msgLvl ( const MSG::Level lvl ) const

inlineinherited

Definition at line 30 of file AthCommonMsg.h.

                                               {
    return this->msgLevel(lvl);
  }

outputHandles()

virtual std::vector< Gaudi::DataHandle * > AthCommonDataStore< AthCommonMsg< AlgTool > >::outputHandles ( ) const

overridevirtualinherited

Return this algorithm's output handles.

We override this to include handle instances from key arrays if they have not yet been declared. See comments on updateVHKA.

renounce()

std::enable_if_t< std::is_void_v< std::result_of_t< decltype(&T::renounce)(T)> > &&!std::is_base_of_v< SG::VarHandleKeyArray, T > &&std::is_base_of_v< Gaudi::DataHandle, T >, void > AthCommonDataStore< AthCommonMsg< AlgTool > >::renounce ( T & h )

inlineprotectedinherited

Definition at line 380 of file AthCommonDataStore.h.

  {
    h.renounce();
    PBASE::renounce (h);
  }

renounceArray()

void AthCommonDataStore< AthCommonMsg< AlgTool > >::renounceArray ( SG::VarHandleKeyArray & handlesArray )

inlineprotectedinherited

remove all handles from I/O resolution

Definition at line 364 of file AthCommonDataStore.h.

                                                          {
    handlesArray.renounce();
  }

sysInitialize()

virtual StatusCode AthCommonDataStore< AthCommonMsg< AlgTool > >::sysInitialize ( )

overridevirtualinherited

Perform system initialization for an algorithm.

We override this to declare all the elements of handle key arrays at the end of initialization. See comments on updateVHKA.

Reimplemented in asg::AsgMetadataTool, AthCheckedComponent< AthAlgTool >, AthCheckedComponent<::AthAlgTool >, and DerivationFramework::CfAthAlgTool.

sysStart()

virtual StatusCode AthCommonDataStore< AthCommonMsg< AlgTool > >::sysStart ( )

overridevirtualinherited

Handle START transition.

We override this in order to make sure that conditions handle keys can cache a pointer to the conditions container.

updateEnergyLoss()

Trk::EnergyLoss Trk::EnergyLossUpdator::updateEnergyLoss ( Trk::EnergyLoss & eLoss, double caloEnergy, double caloEnergyError, double pCaloEntry, double momentumError, int & elossFlag ) const

finaloverridevirtual

Method to recalculate Eloss values for the fit setting an elossFlag using as an input the detailed Eloss information Calorimeter energy, error momentum and momentum error.

Implements Trk::IEnergyLossUpdator.

Definition at line 125 of file EnergyLossUpdator.cxx.

{
  //
  // Input: the detailed EnergyLoss object in the Calorimeter that contains the
  // different Eloss terms and their uncertainties; caloEnergy and error; and
  // the muon momentumError (all in MeV)
  //
  // For use in the MuonSystem
  // Input: caloEnergy = 0. caloEnergyError = 0. and pCaloEntry = pMuonEntry
  // momentum at MuonEntry
  //
  // Output: an updated Energy loss values deltaE()
  //         that can be used in the track fit and corresponds to the Most
  //         Probable EnergyLoss value taking into account the ionization,
  //         radiation and smearing due to the errors including the
  //         momentumError (in MeV)
  //
  //         elossFlag = false if Calorimeter Energy is NOT stored (and later
  //         fitted) on the Eloss object
  //                   = true  Calorimeter Energy is stored and will be fitted
  //
  //  deltaE is used in the final fit
  //
 
  elossFlag = 0;
 
  int isign = 1;
  if (eLoss.deltaE() < 0) {
    isign = -1;
  }
 
  double deltaE = eLoss.deltaE();
  double sigmaDeltaE = eLoss.sigmaDeltaE();
  // Detailed Eloss
  double deltaE_ioni = eLoss.meanIoni();
  double sigmaDeltaE_ioni = 0.45 * eLoss.sigmaIoni(); // sigma Landau
  double deltaE_rad = eLoss.meanRad();
  double sigmaDeltaE_rad =
    eLoss.sigmaRad(); // rms and mean of steep exponential
  double depth = eLoss.length();
 
  // Eloss radiative protection
 
  if (eLoss.meanRad() > 100000.) {
    deltaE_rad = 100000.;
    sigmaDeltaE_rad = eLoss.sigmaRad() * 100000. / eLoss.meanRad();
  }
 
  double sigmaPlusDeltaE = eLoss.sigmaPlusDeltaE();
  double sigmaMinusDeltaE = eLoss.sigmaMinusDeltaE();
 
  double MOP = deltaE_ioni - isign * 3.59524 * sigmaDeltaE_ioni;
 
  //
  // MOP shift due to ionization and radiation
  //
  double MOPshift =
    isign * 50 * 10000. / pCaloEntry +
    isign * 0.75 * std::sqrt(sigmaDeltaE_ioni * sigmaDeltaE_rad);
  double MOPshiftNoRad = isign * 50 * 10000. / pCaloEntry;
  //
  // define sigmas for Landau convoluted with exponential
  //
  double fracErad = sigmaDeltaE_rad +
                    std::abs(deltaE_rad) * pCaloEntry / (800000. + pCaloEntry);
  double sigmaL = sigmaDeltaE_ioni + 0.8 * fracErad / 3.59524;
  //  double sigmaLNoRad = sigmaDeltaE_ioni;
  double sigmaMinus = 1.02 * sigmaDeltaE_ioni + 0.08 * sigmaDeltaE_rad;
  double sigmaPlus = 4.65 * sigmaDeltaE_ioni + 1.16 * sigmaDeltaE_rad;
  //  double sigmaMinusNoRad = 1.02 * sigmaDeltaE_ioni;
  //  double sigmaPlusNoRad = 4.65 * sigmaDeltaE_ioni;
  double xc = momentumError / (sigmaL > 0. ? sigmaL : 1.);
  double correction =
    (0.3849 * xc * xc + 7.76672e-03 * xc * xc * xc) /
    (1 + 2.8631 * xc + 0.3849 * xc * xc + 7.76672e-03 * xc * xc * xc);
 
  //
  // Case where the measured Calorimeter energy is not available (e.g. low pT or
  // not isolated)
  //
 
  if (caloEnergyError <= 0) {
    //
    // Shift of MOP due to momentum resolution
    //
    double MOPreso = isign * 3.59524 * sigmaL * correction;
 
    deltaE = MOP + MOPshift + MOPreso;
    sigmaMinusDeltaE = sigmaMinus;
    sigmaPlusDeltaE = sigmaPlus;
    sigmaDeltaE = std::sqrt(0.5 * sigmaMinusDeltaE * sigmaMinusDeltaE +
                            0.5 * sigmaPlusDeltaE * sigmaPlusDeltaE);
    //
    if (m_optimalRadiation && std::abs(deltaE) < caloEnergy &&
        pCaloEntry > 100000) {
      //
      // Calorimeter measurement can be used as veto to say there was no
      // significant radiation
      //
      // In that case the Eloss is taken as the ionization Eloss
      // Use MOP after correction for landau tail (MOPshiftNoRad) and momentum
      // resolution smearing (MOPreso)
      //
      sigmaL = sigmaDeltaE_ioni + 0.3 * fracErad / 3.59524;
      xc = momentumError / (sigmaL > 0. ? sigmaL : 1.);
      correction =
        (0.3849 * xc * xc + 7.76672e-03 * xc * xc * xc) /
        (1 + 2.8631 * xc + 0.3849 * xc * xc + 7.76672e-03 * xc * xc * xc);
 
      MOPreso = isign * 3.59524 * sigmaL * correction;
      deltaE = MOP + MOPshift + MOPreso;
      sigmaMinusDeltaE = sigmaMinus;
      sigmaPlusDeltaE = sigmaPlus;
      sigmaDeltaE = std::sqrt(0.5 * sigmaMinusDeltaE * sigmaMinusDeltaE +
                              0.5 * sigmaPlusDeltaE * sigmaPlusDeltaE);
    }
  } else {
    double sigmaPlusTot =
      std::sqrt(sigmaPlus * sigmaPlus + caloEnergyError * caloEnergyError);
    if (m_optimalRadiation) {
      sigmaPlusTot =
        std::sqrt(4.65 * sigmaDeltaE_ioni * 4.65 * sigmaDeltaE_ioni +
                  caloEnergyError * caloEnergyError);
    }
    double MOPtot = std::abs(MOP + MOPshift);
    if (m_optimalRadiation) {
      MOPtot = std::abs(MOP + MOPshiftNoRad);
    }
 
    if (caloEnergy > MOPtot + 2 * sigmaPlusTot) {
      //
      // Use measured Calorimeter energy
      //
      //
      // take into account the tail in the Measured Eloss
      //
      double MOPreso = isign * 3.59524 * sigmaL * correction;
      deltaE = isign * caloEnergy + MOPreso;
      sigmaMinusDeltaE = caloEnergyError + 0.08 * sigmaDeltaE_rad;
      sigmaPlusDeltaE = caloEnergyError + 1.16 * sigmaDeltaE_rad;
      sigmaDeltaE = std::sqrt(0.5 * sigmaMinusDeltaE * sigmaMinusDeltaE +
                              0.5 * sigmaPlusDeltaE * sigmaPlusDeltaE);
      elossFlag = 1;
    } else {
      // Use MOP after corrections
 
      //
      // Shift of MOP due to momentum resolution smearing
      //
      sigmaL = sigmaDeltaE_ioni + 0.3 * fracErad / 3.59524;
      xc = momentumError / (sigmaL > 0. ? sigmaL : 1);
      correction =
        (0.3849 * xc * xc + 7.76672e-03 * xc * xc * xc) /
        (1 + 2.8631 * xc + 0.3849 * xc * xc + 7.76672e-03 * xc * xc * xc);
      double MOPreso = isign * 3.59524 * sigmaL * correction;
      //
      // Use MOP after correction for landau tail (MOPshiftNoRad) and radiation
      // (MOPshift) and momentum resolution smearing (MOPreso)
      //
      deltaE = MOP + MOPshift + MOPreso;
      sigmaMinusDeltaE = sigmaMinus;
      sigmaPlusDeltaE = sigmaPlus;
      sigmaDeltaE = std::sqrt(0.5 * sigmaMinusDeltaE * sigmaMinusDeltaE +
                              0.5 * sigmaPlusDeltaE * sigmaPlusDeltaE);
    }
  }
 
  return {deltaE,
                    sigmaDeltaE,
                    sigmaMinusDeltaE,
                    sigmaPlusDeltaE,
                    deltaE_ioni,
                    sigmaDeltaE_ioni,
                    deltaE_rad,
                    sigmaDeltaE_rad,
                    depth};
}

updateVHKA()

void AthCommonDataStore< AthCommonMsg< AlgTool > >::updateVHKA ( Gaudi::Details::PropertyBase & )

inlineinherited

Definition at line 308 of file AthCommonDataStore.h.

                                               {
    // debug() << "updateVHKA for property " << p.name() << " " << p.toString() 
    //         << "  size: " << m_vhka.size() << endmsg;
    for (auto &a : m_vhka) {
      std::vector<SG::VarHandleKey*> keys = a->keys();
      for (auto k : keys) {
        k->setOwner(this);
      }
    }
  }

validationAction()

virtual void Trk::IEnergyLossUpdator::validationAction ( ) const

inlinevirtualinherited

Validation Action: Can be implemented optionally, outside access to internal validation steps.

Definition at line 91 of file IEnergyLossUpdator.h.

{}

varianceDeltaQoverP()

double Trk::EnergyLossUpdator::varianceDeltaQoverP ( const MaterialProperties & , double p, double pathcorrection, PropDirection direction = alongMomentum, ParticleHypothesis particleHypothesis = electron ) const

private

Method to return the variance of the change in q/p for the Bethe-Heitler parameterisation.

Member Data Documentation

m_detailedEloss

BooleanProperty Trk::EnergyLossUpdator::m_detailedEloss

private

Initial value:

{this, "DetailedEloss", true,
    "provide extended EnergyLoss info"}

Definition at line 187 of file EnergyLossUpdator.h.

                                 {this, "DetailedEloss", true,
    "provide extended EnergyLoss info"};

m_detStore

StoreGateSvc_t AthCommonDataStore< AthCommonMsg< AlgTool > >::m_detStore

privateinherited

Pointer to StoreGate (detector store by default)

Definition at line 393 of file AthCommonDataStore.h.

m_evtStore

StoreGateSvc_t AthCommonDataStore< AthCommonMsg< AlgTool > >::m_evtStore

privateinherited

Pointer to StoreGate (event store by default)

Definition at line 390 of file AthCommonDataStore.h.

m_optimalRadiation

BooleanProperty Trk::EnergyLossUpdator::m_optimalRadiation

private

Initial value:

{this, "OptimalRadiation", true,
    "use calorimeter more optimal for radiation detection"}

Definition at line 189 of file EnergyLossUpdator.h.

                                    {this, "OptimalRadiation", true,
    "use calorimeter more optimal for radiation detection"};

m_varHandleArraysDeclared

bool AthCommonDataStore< AthCommonMsg< AlgTool > >::m_varHandleArraysDeclared

privateinherited

Definition at line 399 of file AthCommonDataStore.h.

m_vhka

std::vector<SG::VarHandleKeyArray*> AthCommonDataStore< AthCommonMsg< AlgTool > >::m_vhka

privateinherited

Definition at line 398 of file AthCommonDataStore.h.

---

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

• EnergyLossUpdator.h
• EnergyLossUpdator.cxx