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

bendingRadius()

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 34 of file PixelRecoUtilities.h.

                                                     {
    return pt * fieldInInvGev(iSetup);
  }

References fieldInInvGev(), and DiDispStaMuonMonitor_cfi::pt.

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

curvature()

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 42 of file PixelRecoUtilities.h.

                                                        {
    return InversePt / fieldInInvGev(iSetup);
  }

References fieldInInvGev().

Referenced by VectorHitBuilderAlgorithm::curvatureANDphi(), CAHitTripletGenerator::QuantityDependsPt::evaluator(), CAHitQuadrupletGenerator::QuantityDependsPt::evaluator(), ClusterShapeTrackFilter::getGlobalDirs(), CAHitTripletGenerator::hitNtuplets(), CAHitQuadrupletGenerator::hitNtuplets(), MultiHitGeneratorFromChi2::hitSets(), PixelTripletNoTipGenerator::hitTriplets(), PixelTripletLargeTipGenerator::hitTriplets(), PixelTripletHLTGenerator::hitTriplets(), inversePt(), ThirdHitPredictionFromInvParabola::ipFromCurvature(), ThirdHitPrediction::isCompatibleWithMultipleScattering(), OutInConversionSeedFinder::makeTrackState(), MatchedHitRZCorrectionFromBending::operator()(), PathToPlane2Order::operator()(), RectangularEtaPhiTrackingRegion::phiWindow(), pTFrom2Stubs::rInvFrom2(), PixelFitterByHelixProjections::run(), TrackFitter::run(), L1MuonPixelTrackFitter::run(), GflashTrajectory::setCurvature(), MatchedHitRZCorrectionFromBending::tibMatchedHitZFixup(), L1MuonPixelTrackFitter::valTip(), CAHitTripletGenerator::QuantityDependsPtEval::value(), and CAHitQuadrupletGenerator::QuantityDependsPtEval::value().

fieldInInvGev()

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 25 of file PixelRecoUtilities.h.

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

References PixelRecoUtilities::FieldAt0::fieldInInvGev.

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

inversePt()

template<typename T >

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

inverse pt from curvature

Definition at line 48 of file PixelRecoUtilities.h.

                                                        {
    return curvature * fieldInInvGev(iSetup);
  }

References curvature(), and fieldInInvGev().

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

longitudinalBendingCorrection()

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 55 of file PixelRecoUtilities.h.

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

References bendingRadius(), DiDispStaMuonMonitor_cfi::pt, and CosmicsPD_Skims::radius.

Referenced by RectangularEtaPhiTrackingRegion::estimator().