FactorisedProcess.h

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/*
 *  CepGen: a central exclusive processes event generator
 *  Copyright (C) 2023-2024  Laurent Forthomme
 *
 *  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, either version 3 of the License, or
 *  any later version.
 *
 *  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/>.
 */
 
#ifndef CepGen_Process_FactorisedProcess_h
#define CepGen_Process_FactorisedProcess_h
 
#include "CepGen/Process/PhaseSpaceGenerator.h"
#include "CepGen/Process/Process.h"
 
namespace cepgen {
  namespace proc {
    class FactorisedProcess : public Process {
    public:
      explicit FactorisedProcess(const ParametersList& params, const spdgids_t& output);
      FactorisedProcess(const FactorisedProcess&);
 
      double computeWeight() override;
      void fillKinematics() override final;
 
      static ParametersDescription description();
 
    protected:
      void addEventContent() override;
      void prepareKinematics() override final;
 
      virtual void prepareFactorisedPhaseSpace() = 0;  
      virtual double computeFactorisedMatrixElement() = 0;  
 
      //--- Mandelstam variables
      double that() const;  
      double uhat() const;  
 
      const std::unique_ptr<PhaseSpaceGenerator> psgen_;
      const bool symmetrise_;
      const bool store_alphas_;
 
    private:
      double kin_prefactor_{1.};
    };
  }  // namespace proc
}  // namespace cepgen
 
#endif