BreitWigner.h

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/*  YAP - Yet another PWA toolkit
    Copyright 2015, Technische Universitaet Muenchen,
    Authors: Daniel Greenwald, Johannes Rauch

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


#ifndef yap_BreitWigner_h
#define yap_BreitWigner_h

#include "fwd/DataPartition.h"
#include "fwd/DataPoint.h"
#include "fwd/ParticleCombination.h"
#include "fwd/StatusManager.h"

#include "MassShapeWithNominalMass.h"

#include <complex>
#include <memory>

namespace yap {


class BreitWigner : public MassShapeWithNominalMass
{
public:

    BreitWigner(double mass = -1, double w = -1);

    virtual void setParameters(const ParticleTableEntry& entry) override;

    std::shared_ptr<RealParameter> width()
    { return Width_; }

    const std::shared_ptr<RealParameter> width() const
    { return const_cast<BreitWigner*>(this)->width(); }

    virtual bool consistent() const override;

protected:

    virtual void calculateT(DataPartition& D, const std::shared_ptr<ParticleCombination>& pc, unsigned si) const override;

private:

    std::shared_ptr<RealParameter> Width_;

};

}

#endif