PixelRecoUtilities Namespace Reference

Classes
struct	FieldAt0

Functions
template<typename T >
T	bendingRadius (T pt, const edm::EventSetup &iSetup)
template<typename T >
T	curvature (T InversePt, const edm::EventSetup &iSetup)
float	fieldInInvGev (const edm::EventSetup &iSetup)
template<typename T >
T	inversePt (T curvature, const edm::EventSetup &iSetup)
double	longitudinalBendingCorrection (double radius, double pt, const edm::EventSetup &iSetup)

Detailed Description

Small utility funcions used during seed generation

Function Documentation

template<typename T >

T PixelRecoUtilities::bendingRadius	(	T	pt,
		const edm::EventSetup &	iSetup
	)

gives bending radius in magnetic field, pT in GeV, magnetic field taken at (0,0,0)

Definition at line 35 of file PixelRecoUtilities.h.

References fieldInInvGev().

Referenced by HitPairGeneratorFromLayerPairForPhotonConversion::getPhiRange(), InnerDeltaPhi::InnerDeltaPhi(), and longitudinalBendingCorrection().

{return pt*fieldInInvGev(iSetup);}

template<typename T >

T PixelRecoUtilities::curvature	(	T	InversePt,
		const edm::EventSetup &	iSetup
	)

gives transverse curvature (=1/radius of curvature) in magnetic field, pT in GeV, magnetic field taken at (0,0,0)

Definition at line 41 of file PixelRecoUtilities.h.

References fieldInInvGev().

Referenced by ClusterShapeTrackFilter::getGlobalDirs(), MultiHitGeneratorFromChi2::hitSets(), PixelTripletNoTipGenerator::hitTriplets(), PixelTripletLargeTipGenerator::hitTriplets(), PixelTripletHLTGenerator::hitTriplets(), ThirdHitPrediction::isCompatibleWithMultipleScattering(), OutInConversionSeedFinder::makeTrackState(), PathToPlane2Order::operator()(), TrackFitter::run(), PixelFitterByHelixProjections::run(), L1MuonPixelTrackFitter::run(), and GflashTrajectory::setCurvature().

{return InversePt/fieldInInvGev(iSetup);}

float PixelRecoUtilities::fieldInInvGev ( const edm::EventSetup &  iSetup )

inline

Magnetic field intensity in units of cm/GeV. The value is cached in a static variable, so the actual MagneticField is accessed only once.

Definition at line 26 of file PixelRecoUtilities.h.

References PixelRecoUtilities::FieldAt0::fieldInInvGev.

Referenced by bendingRadius(), curvature(), pixelrecoutilities::LongitudinalBendingCorrection::init(), and inversePt().

                                                          {
    static  FieldAt0 fieldAt0(iSetup);
    return fieldAt0.fieldInInvGev;
  }

template<typename T >

T PixelRecoUtilities::inversePt	(	T	curvature,
		const edm::EventSetup &	iSetup
	)

inverse pt from curvature

Definition at line 45 of file PixelRecoUtilities.h.

References fieldInInvGev().

Referenced by PixelTripletNoTipGenerator::hitTriplets(), PixelFitterByConformalMappingAndLine::run(), TrackFitter::run(), KFBasedPixelFitter::run(), and PixelFitterByHelixProjections::run().

{return curvature*fieldInInvGev(iSetup);}

double PixelRecoUtilities::longitudinalBendingCorrection ( double  radius, double  pt, const edm::EventSetup &  iSetup  )

inline

distance between stright line propagation and helix r_stright_line = radius+longitudinalBendingCorrection(radius,pt)

Definition at line 51 of file PixelRecoUtilities.h.

References bendingRadius().

                                                                                                     {
    double invCurv = bendingRadius(pt,iSetup);
    if ( invCurv == 0. ) return 0.;
    return  radius/6. * radius*radius/(2.*invCurv * 2.*invCurv);
  }