isobarHelicityAmplitude.h

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//
//    Copyright 2010
//
//    This file is part of rootpwa
//
//    rootpwa 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.
//
//    rootpwa 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 rootpwa. If not, see <http://www.gnu.org/licenses/>.
//
//-------------------------------------------------------------------------
// File and Version Information:
// $Rev::                             $: revision of last commit
// $Author::                          $: author of last commit
// $Date::                            $: date of last commit
//
// Description:
//      general isobar decay amplitude in helicity formalism
//
//
// Author List:
//      Boris Grube          TUM            (original author)
//
//
//-------------------------------------------------------------------------


#ifndef ISOBARHELICITYAMPLITUDE_H
#define ISOBARHELICITYAMPLITUDE_H

#include "isobarAmplitude.h"


namespace rpwa {  


        class isobarHelicityAmplitude;
        typedef boost::shared_ptr<isobarHelicityAmplitude> isobarHelicityAmplitudePtr;


        class isobarHelicityAmplitude : public isobarAmplitude {
  
        public:
      
                isobarHelicityAmplitude();
                isobarHelicityAmplitude(const isobarDecayTopologyPtr& decay);
                virtual ~isobarHelicityAmplitude();

                static TLorentzRotation hfTransform(const TLorentzVector& daughterLv);  

                std::string name() const { return "isobarHelicityAmplitude"; }
    
                static bool debug() { return _debug; }                             
                static void setDebug(const bool debug = true) { _debug = debug; }  
    

        private:

                void transformDaughters() const;  

                std::complex<double> twoBodyDecayAmplitude
                (const isobarDecayVertexPtr& vertex,
                 const bool                  topVertex) const;  
    
                static bool _debug;  
    
        };
  
  
        inline
        isobarHelicityAmplitudePtr
        createIsobarHelicityAmplitude(const isobarDecayTopologyPtr& decay)
        {
                isobarHelicityAmplitudePtr amp(new isobarHelicityAmplitude(decay));
                return amp;
        }
  
  
} // namespace rpwa


#endif  // ISOBARHELICITYAMPLITUDE_H