CMSSW Reference Manual

FTSFromVertexToPointFactory::FTSFromVertexToPointFactory ( ) [inline]

Definition at line 30 of file FTSFromVertexToPointFactory.h.

00030 { };

FreeTrajectoryState FTSFromVertexToPointFactory::operator()	(	const MagneticField *	magField,
		const GlobalPoint &	xmeas,
		const GlobalPoint &	xvert,
		float	momentum,
		TrackCharge	charge
	)

Definition at line 23 of file FTSFromVertexToPointFactory.cc.

References funct::C, funct::cos(), MagneticField::inTesla(), PV3DBase< T, PVType, FrameType >::perp(), PV3DBase< T, PVType, FrameType >::phi(), phi, funct::sin(), theta, PV3DBase< T, PVType, FrameType >::theta(), and PV3DBase< T, PVType, FrameType >::z().

00027 {
00028   double BInTesla = magField->inTesla(xmeas).z();
00029   GlobalVector xdiff = xmeas -xvert;
00030   double theta = xdiff.theta();
00031   double phi= xdiff.phi();
00032   double pt = momentum*sin(theta);
00033   double pz = momentum*cos(theta);
00034   double pxOld = pt*cos(phi);
00035   double pyOld = pt*sin(phi);
00036 
00037   double RadCurv = 100*pt/(BInTesla*0.29979);
00038   double alpha = asin(0.5*xdiff.perp()/RadCurv);
00039 
00040   float ca = cos(charge*alpha);
00041   float sa = sin(charge*alpha);
00042   double pxNew =   ca*pxOld + sa*pyOld;
00043   double pyNew =  -sa*pxOld + ca*pyOld;
00044   GlobalVector pNew(pxNew, pyNew, pz);  
00045 
00046   GlobalTrajectoryParameters gp(xmeas, pNew, charge, magField);
00047   
00048   AlgebraicSymMatrix C(5,1);
00049   FreeTrajectoryState VertexToPoint(gp,CurvilinearTrajectoryError(C));
00050 
00051   return VertexToPoint;
00052 }


Public Member Functions
	FTSFromVertexToPointFactory ()
FreeTrajectoryState	operator() (const MagneticField *magField, const GlobalPoint &xmeas, const GlobalPoint &xvert, float momentum, TrackCharge charge)

FTSFromVertexToPointFactory Class Reference

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation