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 // SigmaGeneric.h is a part of the PYTHIA event generator.
 // Copyright (C) 2024 Johan Bijnens,Torbjorn Sjostrand.
 // PYTHIA is licenced under the GNU GPL v2 or later, see COPYING for details.
 // Please respect the MCnet Guidelines, see GUIDELINES for details.
 
 // Header file for various generic production processes, to be used as
 // building blocks for some BSM processes.
 // Currently represented by QCD pair production of colour triplet objects,
 // with spin either 0, 1/2 or 1.
 
 #ifndef Pythia8_SigmaGeneric_H
 #define Pythia8_SigmaGeneric_H
 
 #include "Pythia8/SigmaProcess.h"
 
 namespace Pythia8 {
 
 //==========================================================================
 
 // A derived class for g g -> qG qGbar (generic quark of spin 0, 1/2 or 1).
 
 class Sigma2gg2qGqGbar : public Sigma2Process {
 
 public:
 
   // Constructor.
   Sigma2gg2qGqGbar(int idIn, int codeIn, int spinIn,
     string nameIn = "g g -> qG qGbar") : idNew(idIn), codeSave(codeIn),
     spinSave(spinIn), nCHV(), nameSave(nameIn), hasKappa(), openFracPair(),
     sigma(), sigTS(), sigUS(), sigSum(), kappam1() {}
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate sigmaHat(sHat).
   virtual double sigmaHat() {return sigma;}
 
   // Select flavour, colour and anticolour.
   virtual void setIdColAcol();
 
   // Info on the subprocess.
   virtual string name()    const {return nameSave;}
   virtual int    code()    const {return codeSave;}
   virtual string inFlux()  const {return "gg";}
   virtual int    id3Mass() const {return idNew;}
   virtual int    id4Mass() const {return idNew;}
 
 private:
 
   // Values stored for process type and colour flow selection.
   int    idNew, codeSave, spinSave, nCHV;
   string nameSave;
   bool   hasKappa;
   double openFracPair, sigma, sigTS, sigUS, sigSum, kappam1;
 
 };
 
 //==========================================================================
 
 // A derived class for q qbar -> qG qGbar (generic quark of spin 0, 1/2 or 1).
 
 class Sigma2qqbar2qGqGbar : public Sigma2Process {
 
 public:
 
   // Constructor.
   Sigma2qqbar2qGqGbar(int idIn, int codeIn, int spinIn,
     string nameIn = "q qbar -> qG qGbar") : idNew(idIn), codeSave(codeIn),
     spinSave(spinIn), nCHV(), nameSave(nameIn), openFracPair(), sigma(),
     sigSum(), kappa() {}
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate sigmaHat(sHat).
   virtual double sigmaHat() {return sigma;}
 
   // Select flavour, colour and anticolour.
   virtual void setIdColAcol();
 
   // Info on the subprocess.
   virtual string name()    const {return nameSave;}
   virtual int    code()    const {return codeSave;}
   virtual string inFlux()  const {return "qqbarSame";}
   virtual int    id3Mass() const {return idNew;}
   virtual int    id4Mass() const {return idNew;}
 
 private:
 
   // Values stored for process type and colour flow selection.
   int    idNew, codeSave, spinSave, nCHV;
   string nameSave;
   double openFracPair, sigma, sigSum, kappa;
 
 };
 
 //==========================================================================
 
 // A derived class for f fbar -> fG fGbar (generic spin 0, 1/2 or 1 particle)
 // via gamma^*/Z^* s-channel exchange. Still under development!! ??
 
 class Sigma2ffbar2fGfGbar : public Sigma2Process {
 
 public:
 
   // Constructor.
   Sigma2ffbar2fGfGbar(int idIn, int codeIn, int spinIn,
     string nameIn = "q qbar -> qG qGbar") : idNew(idIn), codeSave(codeIn),
     spinSave(spinIn), nCHV(), nameSave(nameIn), hasColour(), eQHV2(),
     openFracPair(), sigma0(), sigSum(), kappa(), colFac() {}
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate sigmaHat(sHat).
   virtual double sigmaHat();
 
   // Select flavour, colour and anticolour.
   virtual void setIdColAcol();
 
   // Info on the subprocess.
   virtual string name()    const {return nameSave;}
   virtual int    code()    const {return codeSave;}
   virtual string inFlux()  const {return "ffbarSame";}
   virtual int    id3Mass() const {return idNew;}
   virtual int    id4Mass() const {return idNew;}
 
 private:
 
   // Values stored for process type and colour flow selection.
   int    idNew, codeSave, spinSave, nCHV;
   string nameSave;
   bool   hasColour;
   double eQHV2, openFracPair, sigma0, sigSum, kappa, colFac;
 
 };
 
 //==========================================================================
 
 // A derived class for f fbar -> Zv, where Zv couples both to the SM and
 // to a hidden sector. Primitive coupling structure.
 
 class Sigma1ffbar2Zv : public Sigma1Process {
 
 public:
 
   // Constructor.
   Sigma1ffbar2Zv() : idZv(), mRes(), GammaRes(), m2Res(), GamMRat(),
     sigOut(), particlePtr() {}
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate sigmaHat(sHat) for given inflavours.
   virtual double sigmaHat();
 
   // Select flavour, colour and anticolour.
   virtual void setIdColAcol();
 
   // Evaluate weight for decay angles.
   virtual double weightDecay( Event& process, int iResBeg, int iResEnd);
 
   // Info on the subprocess.
   virtual string name()       const {return "f fbar -> Zv";}
   virtual int    code()       const {return 4941;}
   virtual string inFlux()     const {return "ffbarSame";}
   virtual int    resonanceA() const {return 4900023;}
 
 private:
 
   // Store flavour-specific process information and standard prefactor.
   int    idZv;
   double mRes, GammaRes, m2Res, GamMRat, sigOut;
 
   // Pointer to properties of Zv, to access decay width.
   ParticleDataEntryPtr particlePtr;
 
 };
 
 //==========================================================================
 
 } // end namespace Pythia8
 
 #endif // Pythia8_SigmaGeneric_H

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