ThirdHitZPrediction Class Reference

#include <ThirdHitZPrediction.h>

Public Types
typedef PixelRecoRange< float >	Range

Public Member Functions
Range	operator() (const GlobalPoint &p3, float erroRPhi3) const
	ThirdHitZPrediction (const GlobalPoint &p1, float erroRPhi1, float errorZ1, const GlobalPoint &p2, float erroRPhi2, float errorZ2, double curvature, double nSigma=3.)

Private Attributes
double	dR12
double	dS12
double	dZ12
double	sqr_errorXY12
double	sqr_errorXY2
double	theCurvature
double	theErrorZ1
double	theErrorZ2
double	theNSigma
GlobalPoint	thePoint2

Detailed Description

Definition at line 8 of file ThirdHitZPrediction.h.

Member Typedef Documentation

Range

typedef PixelRecoRange<float> ThirdHitZPrediction::Range

Definition at line 10 of file ThirdHitZPrediction.h.

Constructor & Destructor Documentation

ThirdHitZPrediction()

ThirdHitZPrediction::ThirdHitZPrediction ( const GlobalPoint &  p1, float  erroRPhi1, float  errorZ1, const GlobalPoint &  p2, float  erroRPhi2, float  errorZ2, double  curvature, double  nSigma = 3.  )

inline

Definition at line 11 of file ThirdHitZPrediction.h.

      : thePoint2(p2),
        sqr_errorXY12(erroRPhi1 * erroRPhi1 + erroRPhi2 * erroRPhi2),
        sqr_errorXY2(erroRPhi2 * erroRPhi2),
        theErrorZ1(errorZ1),
        theErrorZ2(errorZ2),
        theCurvature(curvature),
        theNSigma(nSigma) {
    auto d = p2 - p1;
    dR12 = d.perp();
    if (dR12 < 1.e-5)
      dR12 = 1.e-5;
    dS12 = std::abs(0.5 * dR12 * theCurvature) < 1 ? std::asin(0.5 * dR12 * theCurvature) : 1.;
    dZ12 = d.z();
  }

References funct::abs(), ztail::d, dR12, dS12, dZ12, MillePedeFileConverter_cfg::e, p1, p2, and theCurvature.

Member Function Documentation

operator()()

ThirdHitZPrediction::Range ThirdHitZPrediction::operator()	(	const GlobalPoint &	p3,
		float	erroRPhi3
	)		const

Definition at line 10 of file ThirdHitZPrediction.cc.

                                                                                                            {
  double dR23 = (thePoint3 - thePoint2).perp();
 
  double slope = dR23 / dR12;
  if ((theCurvature > 1.e-4) && (std::abs(0.5 * dR23 * theCurvature) < 1.))
    slope = std::asin(0.5 * dR23 * theCurvature) / dS12;
 
  double z3 = thePoint2.z() + dZ12 * slope;
 
  double sqr_errorXY23 = sqr_errorXY2 + sqr(erroRPhi3);
  double error = sqrt(sqr((1 + dR23 / dR12) * theErrorZ2) + sqr(dR23 / dR12 * theErrorZ1) +
                      sqr(dZ12 / dR12) * sqr_errorXY23 + sqr((dZ12 / dR12) * (dR23 / dR12)) * sqr_errorXY12);
  error *= theNSigma;
  return Range(z3 - error, z3 + error);
}

References funct::abs(), dR12, dS12, dZ12, MillePedeFileConverter_cfg::e, relativeConstraints::error, perp(), slope, sqr(), sqr_errorXY12, sqr_errorXY2, mathSSE::sqrt(), theCurvature, theErrorZ1, theErrorZ2, theNSigma, thePoint2, and PV3DBase< T, PVType, FrameType >::z().

Member Data Documentation

dR12

double ThirdHitZPrediction::dR12

private

Definition at line 37 of file ThirdHitZPrediction.h.

Referenced by operator()(), and ThirdHitZPrediction().

dS12

double ThirdHitZPrediction::dS12

private

Definition at line 37 of file ThirdHitZPrediction.h.

Referenced by operator()(), and ThirdHitZPrediction().

dZ12

double ThirdHitZPrediction::dZ12

private

Definition at line 37 of file ThirdHitZPrediction.h.

Referenced by operator()(), and ThirdHitZPrediction().

sqr_errorXY12

double ThirdHitZPrediction::sqr_errorXY12

private

Definition at line 38 of file ThirdHitZPrediction.h.

Referenced by operator()().

sqr_errorXY2

double ThirdHitZPrediction::sqr_errorXY2

private

Definition at line 39 of file ThirdHitZPrediction.h.

Referenced by operator()().

theCurvature

double ThirdHitZPrediction::theCurvature

private

Definition at line 41 of file ThirdHitZPrediction.h.

Referenced by operator()(), and ThirdHitZPrediction().

theErrorZ1

double ThirdHitZPrediction::theErrorZ1

private

Definition at line 40 of file ThirdHitZPrediction.h.

Referenced by operator()().

theErrorZ2

double ThirdHitZPrediction::theErrorZ2

private

Definition at line 40 of file ThirdHitZPrediction.h.

Referenced by operator()().

theNSigma

double ThirdHitZPrediction::theNSigma

private

Definition at line 42 of file ThirdHitZPrediction.h.

Referenced by operator()().

thePoint2

GlobalPoint ThirdHitZPrediction::thePoint2

private

Definition at line 36 of file ThirdHitZPrediction.h.

Referenced by operator()().