BlattWeisskopf.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_BlattWeisskopf_h
#define yap_BlattWeisskopf_h

#include "fwd/DataPartition.h"
#include "fwd/DataPoint.h"
#include "fwd/DecayingParticle.h"
#include "fwd/CachedValue.h"
#include "fwd/Model.h"
#include "fwd/ParticleCombination.h"
#include "fwd/StatusManager.h"

#include "AmplitudeComponent.h"
#include "RequiresMeasuredBreakupMomenta.h"

#include <complex>
#include <memory>
#include <string>

namespace yap {


class BlattWeisskopf :
    public RecalculableAmplitudeComponent,
    public RequiresMeasuredBreakupMomenta
{
public:

    BlattWeisskopf(unsigned L, DecayingParticle* dp);

    unsigned L() const
    { return L_; }

    virtual const std::complex<double> value(const DataPoint& d, const std::shared_ptr<ParticleCombination>& pc) const override;

    virtual void calculate(DataPartition& D) const override;

    virtual void updateCalculationStatus(StatusManager& D) const override;

    virtual bool consistent() const
    { return DataAccessor::consistent(); }

    const Model* model() const override;

    const DecayingParticle* decayingParticle() const
    { return DecayingParticle_; }

    friend class DecayingParticle;

protected:

    void addParticleCombination(std::shared_ptr<ParticleCombination> pc) override;

private:

    DecayingParticle* DecayingParticle_;

    unsigned L_;

    std::shared_ptr<RealCachedValue> BarrierFactor_;

};

const double squared_barrier_factor(unsigned l, double z);
}

#endif