LauBreitWignerRes.hh
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	// Copyright University of Warwick 2004 - 2014.
	// Distributed under the Boost Software License, Version 1.0.
	// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

	// Authors:
	// Thomas Latham
	// John Back
	// Paul Harrison

	/*! \file LauBreitWignerRes.hh
	\brief File containing declaration of LauBreitWignerRes class.
	*/

	/*! \class LauBreitWignerRes
	\brief Class for defining the simple Breit-Wigner resonance model

	Class for defining the simple Breit-Wigner resonance model.
	This is a non-relativistic Breit-Wigner, with no mass-dependent width or form factors.
	*/

	#ifndef LAU_BREIT_WIGNER_RES
	#define LAU_BREIT_WIGNER_RES

	#include "TString.h"

	#include "LauComplex.hh"
	#include "LauAbsResonance.hh"


	class LauBreitWignerRes : public LauAbsResonance {

	public:
	//! Constructor
	/*!
	\param [in] resInfo the object containing information on the resonance name, mass, width, spin, charge, etc.
	\param [in] resPairAmpInt the number of the daughter not produced by the resonance
	\param [in] daughters the daughter particles
	*/
	LauBreitWignerRes(LauResonanceInfo* resInfo, const Int_t resPairAmpInt, const LauDaughters* daughters);

	//! Destructor
	virtual ~LauBreitWignerRes();

	//! Initialise the model
	virtual void initialise();

	//! Get the resonance model type
	/*!
	\return the resonance model type
	*/
	virtual LauAbsResonance::LauResonanceModel getResonanceModel() const {return LauAbsResonance::BW;}

	//! Retrieve the resonance parameters, e.g. so that they can be loaded into a fit
	/*!
	\return floating parameters of the resonance
	*/
	virtual const std::vector<LauParameter*>& getFloatingParameters();

	protected:
	//! Complex resonant amplitude
	/*!
	\param [in] mass appropriate invariant mass for the resonance
	\param [in] spinTerm Zemach spin term
	*/
	virtual LauComplex resAmp(Double_t mass, Double_t spinTerm);

	private:
	//! Copy constructor (not implemented)
	LauBreitWignerRes(const LauBreitWignerRes& rhs);

	//! Copy assignment operator (not implemented)
	LauBreitWignerRes& operator=(const LauBreitWignerRes& rhs);

	ClassDef(LauBreitWignerRes,0) // Breit-Wigner resonance model

	};

	#endif

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