breitWignerProductionAmp.cc

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//-----------------------------------------------------------
// File and Version Information:
// $Id$
//
// Description:
//      Implementation of class breitWignerProductionAmp
//      see breitWignerProductionAmp.hh for details
//
//
// Author List:
//      Sebastian Neubert    TUM            (original author)
//
//
//-----------------------------------------------------------

#include "breitWignerProductionAmp.h"


using namespace rpwa;

breitWignerProductionAmp::breitWignerProductionAmp(double mass,
                                                   double width,
                                                   std::complex<double> coupling)
        : _mass(mass),
          _m2(mass*mass),
          _width(width),
          _mw(mass*width),
          _coupling(coupling) { }


std::complex<double>
breitWignerProductionAmp::amp(double mass) {

        std::complex<double> denom(_m2-mass*mass,-_mw);
        std::complex<double> nom(_mw);

        return _coupling*nom/denom;

}