EIC code displayed by LXR master/​include/​Pythia8/​SigmaNewGaugeBosons.h	Source navigation Diff markup Identifier search General search
	Version: master test Revert   Change

File indexing completed on 2025-10-30 08:49:54

 // SigmaNewGaugeBosons.h is a part of the PYTHIA event generator.
 // Copyright (C) 2025 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 new-gauge-boson-process differential cross sections.
 // Contains classes derived from SigmaProcess via Sigma1Process.
 
 #ifndef Pythia8_SigmaNewGaugeBosons_H
 #define Pythia8_SigmaNewGaugeBosons_H
 
 #include "Pythia8/PythiaComplex.h"
 #include "Pythia8/SigmaProcess.h"
 
 namespace Pythia8 {
 
 //==========================================================================
 
 // An intermediate class for f fbar -> Z'/W' -> WW/WZ -> 4 fermions.
 // Copied from SigmaEW for gauge-boson-pair production.
 
 class Sigma1ffbarZprimeWprime: public Sigma1Process {
 
 public:
 
   // Constructor.
   Sigma1ffbarZprimeWprime() {}
 
 protected:
 
   // Internal products.
   Vec4    pRot[7];
   complex hA[7][7];
   complex hC[7][7];
 
   // Calculate and store internal products.
   void setupProd( Event& process, int i1, int i2, int i3, int i4,
     int i5, int i6);
 
   // Evaluate the F function of Gunion and Kunszt.
   complex fGK(int i1, int i2, int i3, int i4, int i5, int i6);
 
   // Evaluate the Xi function of Gunion and Kunszt.
   double xiGK( double tHnow, double uHnow, double s3now, double s4now);
 
   // Evaluate the Xj function of Gunion and Kunszt.
   double xjGK( double tHnow, double uHnow, double s3now, double s4now);
 
 private:
 
 };
 
 //==========================================================================
 
 // A derived class for f fbar -> gamma*/Z0/Z'0.
 
 class Sigma1ffbar2gmZZprime : public Sigma1ffbarZprimeWprime {
 
 public:
 
   // Constructor.
   Sigma1ffbar2gmZZprime() : gmZmode(), maxZpGen(), mRes(), GammaRes(),
     m2Res(), GamMRat(), sin2tW(), cos2tW(), thetaWRat(), mZ(), GammaZ(), m2Z(),
     GamMRatZ(), afZp(), vfZp(), coupZpWW(), anglesZpWW(), gamSum(), gamZSum(),
     ZSum(), gamZpSum(), ZZpSum(), ZpSum(), gamNorm(), gamZNorm(), ZNorm(),
     gamZpNorm(), ZZpNorm(), ZpNorm(), 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();
 
   // Evaluate weight for Z' decay angle.
   virtual double weightDecay( Event& process, int iResBeg, int iResEnd);
 
   // Info on the subprocess.
   virtual string name()       const {return "f fbar -> gamma*/Z0/Zprime0";}
   virtual int    code()       const {return 3001;}
   virtual string inFlux()     const {return "ffbarSame";}
   virtual int    resonanceA() const {return 23;}
   virtual int    resonanceB() const {return 32;}
 
 private:
 
   // Parameters set at initialization or for each new event.
   int    gmZmode, maxZpGen;
   double mRes, GammaRes, m2Res, GamMRat, sin2tW, cos2tW, thetaWRat,
          mZ, GammaZ, m2Z, GamMRatZ, afZp[20], vfZp[20], coupZpWW,
          anglesZpWW, gamSum, gamZSum, ZSum, gamZpSum, ZZpSum, ZpSum,
          gamNorm, gamZNorm, ZNorm, gamZpNorm, ZZpNorm, ZpNorm;
 
   // Pointer to properties of the particle species, to access decay channels.
   ParticleDataEntryPtr particlePtr;
 
 };
 
 //==========================================================================
 
 // A derived class for f fbar' -> W'+-.
 
 class Sigma1ffbar2Wprime : public Sigma1ffbarZprimeWprime {
 
 public:
 
   // Constructor.
   Sigma1ffbar2Wprime() : mRes(), GammaRes(), m2Res(), GamMRat(), thetaWRat(),
     sigma0Pos(), sigma0Neg(), aqWp(), vqWp(), alWp(), vlWp(), coupWpWZ(),
     anglesWpWZ(), 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();
 
   // Evaluate weight for W decay angle.
   virtual double weightDecay( Event& process, int iResBeg, int iResEnd);
 
   // Info on the subprocess.
   virtual string name()       const {return "f fbar' -> W'+-";}
   virtual int    code()       const {return 3021;}
   virtual string inFlux()     const {return "ffbarChg";}
   virtual int    resonanceA() const {return 34;}
 
 private:
 
   // Parameters set at initialization.
   double mRes, GammaRes, m2Res, GamMRat, thetaWRat, sigma0Pos, sigma0Neg,
          aqWp, vqWp, alWp, vlWp, coupWpWZ, anglesWpWZ;
 
   // Pointer to properties of the particle species, to access decay channels.
   ParticleDataEntryPtr particlePtr;
 
 };
 //==========================================================================
 
 // A derived class for f fbar' -> R^0 (horizontal gauge boson).
 
 class Sigma1ffbar2Rhorizontal : public Sigma1Process {
 
 public:
 
   // Constructor.
   Sigma1ffbar2Rhorizontal() : mRes(), GammaRes(), m2Res(), GamMRat(),
     thetaWRat(), sigma0Pos(), sigma0Neg(), 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' -> R^0";}
   virtual int    code()       const {return 3041;}
   virtual string inFlux()     const {return "ffbar";}
   virtual int    resonanceA() const {return 41;}
 
 private:
 
   // Parameters set at initialization.
   double mRes, GammaRes, m2Res, GamMRat, thetaWRat, sigma0Pos, sigma0Neg;
 
   // Pointer to properties of the particle species, to access decay channels.
   ParticleDataEntryPtr particlePtr;
 
 };
 
 //==========================================================================
 
 } // end namespace Pythia8
 
 #endif // Pythia_SigmaNewGaugeBosons_H

This page was automatically generated by the 2.3.7 LXR engine. The LXR team