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 // SigmaDM.h is a part of the PYTHIA event generator.
 // Copyright (C) 2024 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 Dark Matter process differential cross sections.
 // Contains classes derived from SigmaProcess.
 
 #ifndef Pythia8_SigmaDM_H
 #define Pythia8_SigmaDM_H
 
 #include "Pythia8/PythiaComplex.h"
 #include "Pythia8/SigmaProcess.h"
 #include "Pythia8/StandardModel.h"
 
 namespace Pythia8 {
 
 //==========================================================================
 
 // A derived class for f fbar' -> Zprime -> X X. (Zprime a.k.a. DMmed(s=1).)
 
 class Sigma1ffbar2Zp2XX : public Sigma1Process {
 
 public:
 
   // Constructor.
   Sigma1ffbar2Zp2XX() : kinMix(), mRes(), GammaRes(), m2Res(), sigma0(),
     preFac(), gZp(), eps(), particlePtr() {}
 
   // 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 "f fbar -> Zp -> XX";}
   virtual int    code()       const {return 6001;}
   virtual string inFlux()     const {return "qqbar";}
   virtual int    resonanceA() const {return 55;} // Zprime
   virtual bool   isSChannel() const {return true;}
   virtual int    gmZmode()    const {return 3;}
 
 private:
 
   // Parameters set at initialization.
   bool   kinMix;
   double mRes, GammaRes, m2Res, sigma0, preFac, gZp, eps;
 
   // Pointer to properties of the particle species, to access decay channels.
   ParticleDataEntryPtr particlePtr;
 
 };
 
 //==========================================================================
 
 class Sigma2qqbar2Zpg2XXj : public Sigma2Process {
 
 public:
 
   // Constructor.
   Sigma2qqbar2Zpg2XXj() : kinMix(), mRes(), GammaRes(), m2Res(), preFac(),
     sigma0(), gZp(), eps(), particlePtr() {}
 
   // 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 "q qbar -> Zp g -> XX + jet";}
   virtual int    code()       const {return 6002;}
   virtual string inFlux()     const {return "qqbar";}
   virtual int    resonanceA() const {return 55;} // Zprime
   virtual int    id3Mass()    const {return 55;}
   virtual int    id4Mass()    const {return 21;}
   virtual bool   isSChannel() const {return true;}
   virtual int    gmZmode()    const {return 3;}
 
 protected:
 
   // Parameters set at initialization.
   bool   kinMix;
   double mRes, GammaRes, m2Res, preFac, sigma0, gZp, eps;
 
   // Pointer to properties of the particle species, to access decay channels.
   ParticleDataEntryPtr particlePtr;
 
 };
 
 //==========================================================================
 
 class Sigma2qg2Zpq2XXj : public Sigma2qqbar2Zpg2XXj {
 
   // Constructor.
   Sigma2qg2Zpq2XXj() {}
 
   // Info on the subprocess.
   virtual string name()       const {return "q g -> Zp q -> XX + jet";}
   virtual int    code()       const {return 6003;}
   virtual string inFlux()     const {return "qg";}
   virtual int    resonanceA() const {return 55;} // Zprime
   virtual bool   isSChannel() const {return true;}
   virtual int    gmZmode()    const {return 3;}
 
 };
 
 //==========================================================================
 
 // A derived class for f fbar' -> Zprime H, Zprime -> X X.
 
 class Sigma2ffbar2ZpH : public Sigma2Process {
 
 public:
 
   // Constructor.
   Sigma2ffbar2ZpH() : kinMix(), mRes(), GammaRes(), m2Res(), sigma0(), gZp(),
     eps(), coupZpH(), openFrac(), particlePtr() {}
 
   // 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 "f fbar -> Zprime H";}
   virtual int    code()       const {return 6004;}
   virtual string inFlux()     const {return "ffbarSame";}
   virtual bool   isSChannel() const {return true;}
   virtual int    id3Mass()    const {return 55;}
   virtual int    id4Mass()    const {return 25;}
   virtual int    resonanceA() const {return 55;} // Zprime
   virtual int    gmZmode()    const {return 3;}
 
 private:
 
   // Parameters set at initialization.
   bool   kinMix;
   double mRes, GammaRes, m2Res, sigma0, gZp, eps, coupZpH, openFrac;
 
   // Pointer to properties of the particle species, to access decay channels.
   ParticleDataEntryPtr particlePtr;
 
 };
 
 //==========================================================================
 
 class Sigma1gg2S2XX : public Sigma1Process {
 
 public:
 
   // Constructor.
   Sigma1gg2S2XX() : mRes(), GammaRes(), m2Res(), sigma0(), particlePtr() {}
 
   // 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 "g g -> S -> XX";}
   virtual int    code()       const {return 6011;}
   virtual string inFlux()     const {return "gg";}
   virtual int    resonanceA() const {return 54;} // scalar mediator
   virtual bool   isSChannel() const {return true;}
 
 private:
 
   // Parameters set at initialization.
   double mRes, GammaRes, m2Res, sigma0;
 
   // Pointer to properties of the particle species, to access decay channels.
   ParticleDataEntryPtr particlePtr;
 
 };
 
 //==========================================================================
 
 class Sigma2gg2Sg2XXj : public Sigma2Process {
 
 public:
 
   // Constructor.
   Sigma2gg2Sg2XXj() : mRes(), GammaRes(), m2Res(), propS(), sigma0(),
     particlePtr() {}
 
   // 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 "g g -> S g -> XX + jet";}
   virtual int    code()       const {return 6012;}
   virtual string inFlux()     const {return "gg";}
   virtual int    resonanceA() const {return 54;} // scalar mediator
   virtual bool   isSChannel() const {return true;}
   virtual int    id3Mass()    const {return 54;}
   virtual int    id4Mass()    const {return 21;}
 
 protected:
 
   // Parameters set at initialization.
   double mRes, GammaRes, m2Res, propS, sigma0;
 
   // Pointer to properties of the particle species, to access decay channels.
   ParticleDataEntryPtr particlePtr;
 
 };
 
 //==========================================================================
 
 class Sigma2qg2Sq2XXj : public Sigma2gg2Sg2XXj {
 
 public:
 
   // Constructor.
   Sigma2qg2Sq2XXj() {}
 
   // Info on the subprocess.
   virtual string name()       const {return "q g -> S q -> XX + jet";}
   virtual int    code()       const {return 6013;}
   virtual string inFlux()     const {return "qg";}
   virtual bool   isSChannel() const {return true;}
 
 };
 
 //==========================================================================
 
 class Sigma2qqbar2DY : public Sigma2Process {
 
 public:
 
   // Constructor,
   Sigma2qqbar2DY() : sigma0(), openFracPair(), propRes(), nameSave(), mRes(),
     GammaRes(), m2Res(), M1(), M2(), Lambda(), mixN1(), mixN2(), xW(),
     coupW11(), coupW12(), coupW2(), yuk(), type(), nplet(), isUD(),
     particlePtr() {}
 
   // 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 6020;}
   virtual string inFlux()     const {return "qqbar";}
   virtual int    resonanceA() const {return 23;}
   virtual bool   isSChannel() const {return true;}
   virtual int    id3Mass()    const {return abs(id3);}
   virtual int    id4Mass()    const {return abs(id4);}
 
 protected:
 
   // Parameters set at initialization.
   double  sigma0, openFracPair;
   complex propRes;
   string  nameSave;
   double  mRes, GammaRes, m2Res;
 
   // Couplings for 5-plet.
   double M1, M2, Lambda, mixN1, mixN2, xW, coupW11, coupW12, coupW2;
 
   // Variables for sleptons.
   double yuk[4];
 
   // Type of model and N-plet. Flag for HNL production.
   int  type, nplet;
   bool isUD;
 
   // Pointer to properties of the particle species, to access decay channels.
   ParticleDataEntryPtr particlePtr;
 
   };
 
 //==========================================================================
 
 } // end namespace Pythia8
 
 #endif // Pythia_SigmaDM_H

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