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PhotonFlux.h
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//==============================================================================
// PhotonFlux.h
//
// Copyright (C) 2010-2013 Tobias Toll and Thomas Ullrich
//
// This file is part of Sartre.
//
// 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.
// 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/>.
//
// Author: Thomas Ullrich
// Last update:
// $Date: 2018-06-29 20:11:00 +0100 (Fri, 29 Jun 2018) $
// $Author: ullrich $
//==============================================================================
//
// Functor class.
// Photon flux is given in: d2sig/(dQ2 dW2)
//==============================================================================
#ifndef PhotonFlux_h
#define PhotonFlux_h
#include "Enumerations.h"
#include "EventGeneratorSettings.h"
#include "TH1D.h"
class Nucleus;
class PhotonFlux {
public:
PhotonFlux();
PhotonFlux(double s);
void setS(double);
double operator()(double Q2, double W2, GammaPolarization p) const;
//UPC:
double operator()(double Egamma) const;
double nuclearPhotonFlux(double Egamma) const;
private:
double fluxTransverse(double Q2, double W2) const;
double fluxLongitudinal(double Q2, double W2) const;
double mS;
bool mSIsSet;
//UPC:
double uiNuclearPhotonFlux(double*, double*) const;
double sigma_nn(double) const;
double TAA(double);
double TAAForIntegration(const double*) const;
void calculateTAAlookupTable();
bool mIsUPC;
double mEBeamEnergy;
TH1D* mTAA_of_b;
double mB;
Nucleus* mNucleus;
Nucleus* mNucleusUPC;
EventGeneratorSettings *mSettings;
};
#endif

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