P4ErrorTransforms.cxx

Go to the documentation of this file.

/*
  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
*/
 
#include "FourMom/P4ErrorTransforms.h"
#include "FourMom/ErrorMatrixPxPyPzE.h"
#include "FourMom/ErrorMatrixEEtaPhiM.h"
#include "FourMom/P4JacobianPxPyPzE2EEtaPhiM.h"
#include "FourMom/P4JacobianEEtaPhiM2PxPyPzE.h"
 
namespace P4ErrorTransforms {
 
std::unique_ptr<ErrorMatrixEEtaPhiM> toEEtaPhiM( const ErrorMatrixPxPyPzE& em,
                                                 double px, double py, double pz, double E)
  {
    P4JacobianPxPyPzE2EEtaPhiM J( px, py, pz, E);
    CLHEP::HepSymMatrix res(4);
    res = em.hsm().similarity(J);
    return std::make_unique<ErrorMatrixEEtaPhiM>(res);
  }
 
std::unique_ptr<ErrorMatrixPxPyPzE> toPxPyPzE( const ErrorMatrixEEtaPhiM& em,
                                               double E, double eta, double phi, double M)
  {
    P4JacobianEEtaPhiM2PxPyPzE J( E, eta, phi, M);
    CLHEP::HepSymMatrix res(4);
    res = em.hsm().similarity(J);
    return std::make_unique<ErrorMatrixPxPyPzE>(res);
  }
 
 
}