#include <eic-smear/blob/master/include/eicsmear/smear/Tracker.h>

Inheritance diagram for Smear::Tracker:

Collaboration diagram for Smear::Tracker:

Public Member Functions
	Tracker (double magneticField=2., double nRadiationLengths=0.01, double resolution=0.001)

virtual	~Tracker ()

virtual double	Resolution (const erhic::VirtualParticle &) const

void	Smear (const erhic::VirtualParticle &, ParticleMCS &)

virtual double	L (const erhic::VirtualParticle &) const =0

virtual double	LPrime (const erhic::VirtualParticle &) const =0

virtual int	NPoints (const erhic::VirtualParticle &) const =0

virtual bool	Accepts (const erhic::VirtualParticle &) const =0

virtual double	GetThetaMin () const =0

virtual double	GetThetaMax () const =0

void	SetVertexConstraint (bool constrain)

Public Member Functions inherited from Smear::Smearer
virtual	~Smearer ()

virtual Smearer *	Clone (const char *="") const =0

Protected Member Functions
virtual double	MultipleScatteringContribution (const erhic::VirtualParticle &) const

virtual double	IntrinsicContribution (const erhic::VirtualParticle &) const

Protected Attributes
Int_t	mFactor

double	mMagField
	Magnetic field strength in Tesla.

double	mNRadLengths
	Number of radiation lengths (dimensionless)

double	mSigmaRPhi
	Point resolution.

Distributor	Distribution
	Random distribution.

Additional Inherited Members
Public Attributes inherited from Smear::Smearer
Acceptance	Accept

Detailed Description

A cylindrical tracking detector. Implements both intrinsic and multiple-scattering resolution. Abstract base class: inheriting classes must implement L(), LPrime(), NPoints() and Accepts().

Definition at line 35 of file Tracker.h.

View newest version in sPHENIX GitHub at line 35 of file Tracker.h

Constructor & Destructor Documentation

Smear::Tracker::Tracker	(	double	magneticField = `2.`,
		double	nRadiationLengths = `0.01`,
		double	resolution = `0.001`
	)

Constructor.

Definition at line 32 of file Tracker.cxx.

View newest version in sPHENIX GitHub at line 32 of file Tracker.cxx

Smear::Tracker::~Tracker ( )

virtual

Destructor.

Definition at line 40 of file Tracker.cxx.

View newest version in sPHENIX GitHub at line 40 of file Tracker.cxx

Member Function Documentation

virtual bool Smear::Tracker::Accepts ( const erhic::VirtualParticle & ) const

pure virtual

Returns true if the particle falls within the angular acceptance of the detector.

Implemented in Smear::PlanarTracker, and Smear::RadialTracker.

Referenced by Resolution(), and Smear().

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virtual double Smear::Tracker::GetThetaMax ( ) const

pure virtual

Returns the maximum theta of particles accepted by the tracker (radians).

Implemented in Smear::PlanarTracker, and Smear::RadialTracker.

virtual double Smear::Tracker::GetThetaMin ( ) const

pure virtual

Returns the minimum theta of particles accepted by the tracker (radians).

Implemented in Smear::PlanarTracker, and Smear::RadialTracker.

double Smear::Tracker::IntrinsicContribution ( const erhic::VirtualParticle & p ) const

protectedvirtual

The intrinsic resolution of the detector, depending on momentum, magnetic field, the detector dimensions, the number of fit points and the point resolution.

Definition at line 55 of file Tracker.cxx.

View newest version in sPHENIX GitHub at line 55 of file Tracker.cxx

References erhic::VirtualParticle::GetP(), LPrime(), mFactor, mMagField, mSigmaRPhi, and NPoints().

Referenced by Resolution().

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virtual double Smear::Tracker::L ( const erhic::VirtualParticle & ) const

pure virtual

Returns the path length of the particle through the tracker in metres.

Implemented in Smear::PlanarTracker, and Smear::RadialTracker.

virtual double Smear::Tracker::LPrime ( const erhic::VirtualParticle & ) const

pure virtual

Returns the transverse path length of the particle through the tracker in metres.

Implemented in Smear::PlanarTracker, and Smear::RadialTracker.

Referenced by IntrinsicContribution(), and MultipleScatteringContribution().

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double Smear::Tracker::MultipleScatteringContribution ( const erhic::VirtualParticle & p ) const

protectedvirtual

Multiple scattering contribution, given by delta(p)/p = 0.0136 * z * sqrt(NRL) / (0.3 * B * L * beta) z = charge, NRL = # radiation lengths, B = mag field, L = track length, beta = particle velocity.

Definition at line 43 of file Tracker.cxx.

View newest version in sPHENIX GitHub at line 43 of file Tracker.cxx

References erhic::VirtualParticle::Get4Vector(), erhic::VirtualParticle::GetP(), LPrime(), mMagField, and mNRadLengths.

Referenced by Resolution().

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virtual int Smear::Tracker::NPoints ( const erhic::VirtualParticle & ) const

pure virtual

Returns the number of measurement points for the particle.

Implemented in Smear::PlanarTracker, and Smear::RadialTracker.

Referenced by IntrinsicContribution().

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double Smear::Tracker::Resolution ( const erhic::VirtualParticle & p ) const

virtual

Returns the resolution at the kinematics of this particle.

Definition at line 72 of file Tracker.cxx.

View newest version in sPHENIX GitHub at line 72 of file Tracker.cxx

References Accepts(), IntrinsicContribution(), and MultipleScatteringContribution().

Referenced by Smear().

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void Smear::Tracker::SetVertexConstraint ( bool constrain )

Set whether a vertex constraint should be used when calculating the intrinsic resolution. Without it a factor of sqrt(720) is included in the resolution; with it the factor is sqrt(320). By defuault no constraint is assumed.

Definition at line 100 of file Tracker.cxx.

View newest version in sPHENIX GitHub at line 100 of file Tracker.cxx

References mFactor.

void Smear::Tracker::Smear	(	const erhic::VirtualParticle &	pIn,
		ParticleMCS &	pOut
	)

virtual

Smear the properties of the input particle and store the smeared values in the ParticleMCS.

Implements Smear::Smearer.

Definition at line 82 of file Tracker.cxx.

View newest version in sPHENIX GitHub at line 82 of file Tracker.cxx

References Smear::Smearer::Accept, Accepts(), Distribution, Smear::Distributor::Generate(), Smear::ParticleMCS::GetP(), Smear::GetVariable(), Smear::ParticleMCS::HandleBogusValues(), Smear::Acceptance::Is(), Smear::kP, Resolution(), Smear::ParticleMCS::SetVariable(), and y.

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Member Data Documentation

Distributor Smear::Tracker::Distribution

protected

Random distribution.

Definition at line 121 of file Tracker.h.

View newest version in sPHENIX GitHub at line 121 of file Tracker.h

Referenced by Smear().

Int_t Smear::Tracker::mFactor

protected

Factor in intrinsic resolution calculation dependent on vertex constraint.

Definition at line 116 of file Tracker.h.

View newest version in sPHENIX GitHub at line 116 of file Tracker.h

Referenced by IntrinsicContribution(), and SetVertexConstraint().

double Smear::Tracker::mMagField

protected

Magnetic field strength in Tesla.

Definition at line 118 of file Tracker.h.

View newest version in sPHENIX GitHub at line 118 of file Tracker.h

Referenced by IntrinsicContribution(), MultipleScatteringContribution(), Smear::PlanarTracker::Print(), and Smear::RadialTracker::Print().

double Smear::Tracker::mNRadLengths

protected

Number of radiation lengths (dimensionless)

Definition at line 119 of file Tracker.h.

View newest version in sPHENIX GitHub at line 119 of file Tracker.h

Referenced by MultipleScatteringContribution(), Smear::PlanarTracker::Print(), and Smear::RadialTracker::Print().

double Smear::Tracker::mSigmaRPhi

protected

Point resolution.

Definition at line 120 of file Tracker.h.

View newest version in sPHENIX GitHub at line 120 of file Tracker.h

Referenced by IntrinsicContribution(), Smear::PlanarTracker::Print(), and Smear::RadialTracker::Print().

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

eic-smear/blob/master/include/eicsmear/smear/Tracker.h
eic-smear/blob/master/src/smear/Tracker.cxx

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation