breitWignerProductionAmp.h

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//-----------------------------------------------------------
// File and Version Information:
// $Id$
//
// Description:
//      Parameterization of Production amplitude
//
// Author List:
//      Sebastian Neubert    TUM            (original author)
//
//
//-----------------------------------------------------------

#ifndef TBWPRODUCTIONAMP_HH
#define TBWPRODUCTIONAMP_HH

#include "productionAmp.h"

#include <complex>

namespace rpwa {

        class breitWignerProductionAmp : public productionAmp {

          public:

                        breitWignerProductionAmp(double mass,
                                                 double width,
                                                 std::complex<double> coupling=std::complex<double>(1,0));
                        virtual ~breitWignerProductionAmp() { }

                        virtual std::complex<double> amp(double mass); //> simple one parameter case

          private:

                        double _mass;
                        double _m2;
                        double _width;
                        double _mw;
                        std::complex<double> _coupling;

        };

}

#endif