Higgs.h

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//-*-C++-*-
//-*-Higgs.h-*-
//   Written by James Monk and Andrew Pilkington
 
#ifndef HIGGS_HH
#define HIGGS_HH
 
#include "GeneratorInterface/ExhumeInterface/interface/CrossSection.h"
 
namespace Exhume {
 
  class Higgs : public CrossSection {
  public:
    Higgs(const edm::ParameterSet &);
 
    double SubProcess() override;
    void SetPartons() override;
    void SetSubParameters() override;
    double SubParameterWeight() override;
    void MaximiseSubParameters() override;
    double SubParameterRange() override;
    void SetHiggsMass(const double &);
    inline double GetC() { return (C); };
    inline std::complex<double> GetPropagator() { return (Propagator()); };
 
    void SetHiggsDecay(const int &);
 
  private:
    double HiggsWidth_();
 
    void SetC();
 
    inline std::complex<double> Propagator() {
      //See hep-ph 9505211
 
      return (I * (1.0 + I * HiggsWidth / HiggsMass) / (sHat - HiggsMass2 + I * HiggsWidth * sHat / HiggsMass));
    };
 
    inline std::complex<double> GluGlu2HiggsAmp() {
      return (GGHConst * sHat * AlphaS_ * (Fsf(sHat * FsfTop) + Fsf(sHat * FsfBottom)));
    };
 
    std::complex<double> GGHConst;
    double AlphaS_, FsfTop, FsfBottom, NLOConst;
    double HiggsMass2, HiggsWidth, TotWidth;
    double C, One;
    double *BR;
  };
 
}  // namespace Exhume
 
#endif