EvtSLDiBaryonAmp.hh
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	/***********************************************************************
	* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
	* *
	* This file is part of EvtGen. *
	* *
	* EvtGen 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. *
	* *
	* EvtGen 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 EvtGen. If not, see <https://www.gnu.org/licenses/>. *
	***********************************************************************/

	#ifndef EVTSLDIBARYONAMP_HH
	#define EVTSLDIBARYONAMP_HH

	#include "EvtGenBase/EvtAmp.hh"
	#include "EvtGenBase/EvtDiracSpinor.hh"
	#include "EvtGenBase/EvtId.hh"
	#include "EvtGenBase/EvtVector4C.hh"
	#include "EvtGenBase/EvtVector4R.hh"

	#include "EvtGenModels/EvtBToDiBaryonlnupQCDFF.hh"

	#include <vector>

	class EvtParticle;

	// Description: Routine to implement semileptonic decays to dibaryonic final
	// state. Details of amplitude calculation to be found in arXiv:1107.0801.

	class EvtSLDiBaryonAmp {
	public:
	EvtSLDiBaryonAmp( const EvtBToDiBaryonlnupQCDFF& );

	void CalcAmp( EvtParticle* parent, EvtAmp& amp ) const;

	protected:
	int checkDibaryonParity( const EvtId& id1, const EvtId& id2, const int J1,
	const int J2 ) const;

	int getBaryonParity( const EvtId& id ) const;

	std::vector<EvtVector4C> getHadronicCurrents(
	const EvtDiracSpinor& u, const EvtDiracSpinor& v, const EvtVector4R& p,
	const EvtVector4R& gMtmTerms, const EvtVector4R& fMtmTerms ) const;

	private:
	EvtBToDiBaryonlnupQCDFF ffModel_;
	};

	#endif

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