JOscFlux.hh

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#ifndef __JAANET__JOSCFLUX__
#define __JAANET__JOSCFLUX__

#include "km3net-dataformat/offline/Evt.hh"
#include "km3net-dataformat/offline/Trk.hh"

#include "flux/Flux.hh"

#include "JLang/JClonable.hh"

#include "JAAnet/JFlux.hh"
#include "JAAnet/JDiffuseFlux.hh"
#include "JAAnet/JAAnetToolkit.hh"
#include "JAAnet/JEvtWeightFactorHelper.hh"

#include "JOscProb/JOscProb.hh"
#include "JOscProb/JOscChannel.hh"
#include "JOscProb/JOscProbHelper.hh"


/**
 * \author bjung
 */

namespace JAANET {

  using JLANG::JClonable;

  using JOSCPROB::JOscProb;
  using JOSCPROB::JOscChannel;
  using JOSCPROB::JOscProbHelper;
  
  using JOSCPROB::getOscChannel;
  using JOSCPROB::NUMBER_OF_OSCCHANNELS;
  

  /**
   * Implementation of oscillated neutrino flux.
   */ 
  struct JOscFlux :
    public JClonable<JFlux, JOscFlux>,
    public JDiffuseFluxHelper,
    public JOscProbHelper
  {
    /**
     * Default constructor.
     */
    JOscFlux()
    {}


    /**
     * Constructor.
     *
     * \param  diffuseFlux       diffuse flux object
     * \param  oscProb           oscillation probability interface
     */
    JOscFlux(const JDiffuseFlux& diffuseFlux,
             const JOscProb&     oscProb)
    {
      JDiffuseFluxHelper::configure(diffuseFlux);
      JOscProbHelper::configure(oscProb);
    }
    
    
    /**
     * Get flux for given event.
     *
     * Note that in this evaluation the zenith-angle is defined\n
     * with respect to the line of sight (i.e. a neutrino pointing straight at you\n
     * from the center of the Earth has \f$cos(\theta) = -1.0\f$).
     *
     * \param  evt               event
     * \return                   flux  [GeV^-1 * m^-2 * sr^-1 * s^-1]
     */
    double operator()(const Evt& evt) const
    {
      double flux = 0.0;
      
      const Trk& neutrino = get_neutrino(evt);
      const double log10E = log10(neutrino.E);
      const double costh  = -neutrino.dir.z / neutrino.dir.len(); 

      if (costh < 0.0) {
        
        const JOscChannel::JFlavour_t      flavour = JOscChannel::getFlavour(neutrino);
        const JOscChannel::JChargeParity_t Cparity = JOscChannel::getChargeParity(neutrino);

        for (int i = 0; i != NUMBER_OF_OSCCHANNELS; ++i) {

          const JOscChannel& channel = getOscChannel[i];
          const int          typeIn  = (int) JOscChannel::getIncomingNeutrinoType(channel);
        
          if (channel.out == flavour && channel.Cparity == Cparity) {
          
            flux += ( JDiffuseFluxHelper::getFactor(typeIn, log10E, costh) *
                      JOscProbHelper::getOscProb(channel, log10E, costh) );
          }
        }
        
      } else {

        flux = JDiffuseFluxHelper::getFactor(neutrino.type, log10E, costh);
      }
      
      return flux;
    }


    /**
     * Get event-weight factor for given event.
     *
     * \param  evt               event
     * \return                   event-weight factor [GeV^-1 * m^-2 * sr^-1 * s^-1]
     */
    double getFactor(const Evt& evt) const override
    {
      return (*this)(evt);
    }
  };
}

#endif