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PixelRecoUtilities Namespace Reference

Small utility funcions used during seed generation. More...

Functions
template<typename T>
T	bendingRadius (T pt, const edm::EventSetup &iSetup)
	gives bending radius in magnetic field, pT in GeV, magnetic field taken at (0,0,0)
template<typename T>
T	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)
float	fieldInInvGev (const edm::EventSetup &iSetup)
	Magnetic field intensity in units of cm/GeV.
template<typename T>
T	inversePt (T curvature, const edm::EventSetup &iSetup)
	inverse pt from curvature
double	longitudinalBendingCorrection (double radius, double pt, const edm::EventSetup &iSetup)
	distance between stright line propagation and helix r_stright_line = radius+longitudinalBendingCorrection(radius,pt)

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Detailed Description

Small utility funcions used during seed generation.

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Function Documentation

template<typename T>

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

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

Definition at line 25 of file PixelRecoUtilities.h.

References fieldInInvGev().

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

{return pt*fieldInInvGev(iSetup);}

template<typename T>

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

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

Definition at line 31 of file PixelRecoUtilities.h.

References fieldInInvGev().

Referenced by PixelTripletHLTGenerator::hitTriplets(), OutInConversionSeedFinder::makeTrackState(), PathToPlane2Order::operator()(), RectangularEtaPhiTrackingRegion::phiWindow(), L1MuonPixelTrackFitter::run(), TrackFitter::run(), and PixelFitterByHelixProjections::run().

{return InversePt/fieldInInvGev(iSetup);}

float PixelRecoUtilities::fieldInInvGev

(

const edm::EventSetup &

iSetup

)

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 21 of file PixelRecoUtilities.cc.

References edm::EventSetup::get().

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

{  
  edm::ESHandle<MagneticField> pSetup;
  iSetup.get<IdealMagneticFieldRecord>().get(pSetup);
  //MP da capire come accedere al B 
  static float theInvField = 
    1./fabs(pSetup->inTesla(GlobalPoint(0,0,0)).z()  *2.99792458e-3);
  return theInvField;
}

template<typename T>

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

inverse pt from curvature

Definition at line 35 of file PixelRecoUtilities.h.

References fieldInInvGev().

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

{return curvature*fieldInInvGev(iSetup);}

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

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

Definition at line 8 of file PixelRecoUtilities.cc.

References bendingRadius().

Referenced by RectangularEtaPhiTrackingRegion::estimator().

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

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