P4JacobianEEtaPhiM2PxPyPzE Class Reference

#include <P4JacobianEEtaPhiM2PxPyPzE.h>

Inheritance diagram for P4JacobianEEtaPhiM2PxPyPzE:

Collaboration diagram for P4JacobianEEtaPhiM2PxPyPzE:

Public Member Functions
	P4JacobianEEtaPhiM2PxPyPzE (double E, double eta, double phi, double M)

Detailed Description

Definition at line 10 of file P4JacobianEEtaPhiM2PxPyPzE.h.

Constructor & Destructor Documentation

P4JacobianEEtaPhiM2PxPyPzE()

P4JacobianEEtaPhiM2PxPyPzE::P4JacobianEEtaPhiM2PxPyPzE	(	double	E,
		double	eta,
		double	phi,
		double	M )

Definition at line 10 of file P4JacobianEEtaPhiM2PxPyPzE.cxx.

                                      :
  HepMatrix(4,4,0)
{
  double t = exp(-eta); // == tg(theta/2)
  double P = std::sqrt( std::max( 0., E*E - M*M));
  double u = 1+t*t; 
  double cosTheta = (1-t*t)/u;
  double sinTheta = 2*t/u;
  double sinPhi = sin(phi);
  double cosPhi = cos(phi);
  double pt = P * sinTheta; 
 
  (*this)[0][0] = E/P * sinTheta*cosPhi; // dpx/dE
  (*this)[1][0] = E/P * sinTheta*sinPhi; // dpy/dE
  (*this)[2][0] = E/P * cosTheta;        // dpz/dE
  (*this)[3][0] = 1;                     // dE/dE
 
  (*this)[0][1] = -P * cosPhi * cosTheta*sinTheta; // dpx/deta
  (*this)[1][1] = -P * sinPhi * cosTheta*sinTheta; // dpy/deta
  (*this)[2][1] = P * sinTheta*sinTheta;           // dpz/deta;
 
  (*this)[0][2] = -pt * sinPhi;  // dpx/dphi
  (*this)[1][2] = pt * cosPhi;   // dpy/dphi
 
  (*this)[0][3] = -M/P * sinTheta*cosPhi; // dpx/dM
  (*this)[1][3] = -M/P * sinTheta*sinPhi; // dpy/dM
  (*this)[2][3] = -M/P * cosTheta;        // dpz/dM
}

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The documentation for this class was generated from the following files:

• P4JacobianEEtaPhiM2PxPyPzE.h
• P4JacobianEEtaPhiM2PxPyPzE.cxx