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 // SigmaSUSY.h is a part of the PYTHIA event generator.
 // Copyright (C) 2025 Torbjorn Sjostrand.
 // Main authors of this file: N. Desai, P. Skands
 // 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 Supersymmetric process differential cross sections.
 // Contains classes derived from SigmaProcess via Sigma2Process.
 
 #ifndef Pythia8_SigmaSUSY_H
 #define Pythia8_SigmaSUSY_H
 
 #include "Pythia8/PhaseSpace.h"
 #include "Pythia8/PythiaComplex.h"
 #include "Pythia8/SigmaProcess.h"
 #include "Pythia8/SusyCouplings.h"
 
 namespace Pythia8 {
 
 //==========================================================================
 
 // An intermediate class for SUSY 2 -> 2 with nontrivial decay angles.
 
 class Sigma2SUSY : public Sigma2Process {
 
 public:
 
   // Evaluate weight for decay angles.
   virtual double weightDecay( Event& process, int iResBeg, int iResEnd);
   void setPointers(string processIn);
 
  };
 
 //==========================================================================
 
 // A derived class for q qbar -> neutralino_i neutralino_j.
 
 class Sigma2qqbar2chi0chi0 : public Sigma2SUSY {
 
 public:
 
   // Constructor.
   Sigma2qqbar2chi0chi0() : id3chi(), id4chi(), codeSave(), sigma0(),
     ui(), uj(), ti(), tj(), openFracPair() {};
 
   // Constructor.
   Sigma2qqbar2chi0chi0(int id3chiIn, int id4chiIn, int codeIn) : sigma0(),
     ui(), uj(), ti(), tj(), openFracPair() {
 
     // Save ordering indices and process code
     id3chi   = id3chiIn;
     id4chi   = id4chiIn;
     codeSave = codeIn;
 
 
     // Construct id codes from ordering indices.
     id3                  = 1000022;
     if (id3chi == 2) id3 = 1000023;
     if (id3chi == 3) id3 = 1000025;
     if (id3chi == 4) id3 = 1000035;
     if (id3chi == 5) id3 = 1000045;
     id4                  = 1000022;
     if (id4chi == 2) id4 = 1000023;
     if (id4chi == 3) id4 = 1000025;
     if (id4chi == 4) id4 = 1000035;
     if (id4chi == 5) id4 = 1000045;
 
   }
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   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 nameSave;}
   virtual int    code()    const {return codeSave;}
   virtual string inFlux()  const {return "ff";}
   virtual int    id3Mass() const {return abs(id3);}
   virtual int    id4Mass() const {return abs(id4);}
   virtual int    resonanceA() const {return 23;}
   virtual bool   isSUSY()  const {return true;}
   virtual double getSigma0() const {return sigma0;}
 
  protected:
 
   // Basic process information
   int     id3chi, id4chi, codeSave;
   string  nameSave;
 
   // Values stored for later use
   double  sigma0, ui, uj, ti, tj, openFracPair;
   complex propZ;
 
 };
 
 //==========================================================================
 
 // A derived class for q qbar -> neutralino_i chargino_j.
 
 class Sigma2qqbar2charchi0 : public Sigma2qqbar2chi0chi0 {
 
 public:
 
   // Constructor.
   Sigma2qqbar2charchi0(int id3chiIn, int id4chiIn, int codeIn) {
 
     // Save ordering indices and process code
     id3chi   = id3chiIn;
     id4chi   = id4chiIn;
     codeSave = codeIn;
 
     // Construct id codes from ordering indices.
     id3 = (abs(id3chi) == 2) ? 1000037 : 1000024;
     if (id3chi < 0)  id3 = -id3;
 
     id4                  = 1000022;
     if (id4chi == 2) id4 = 1000023;
     if (id4chi == 3) id4 = 1000025;
     if (id4chi == 4) id4 = 1000035;
     if (id4chi == 5) id4 = 1000045;
 
   }
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   virtual double sigmaHat();
 
   virtual int    resonanceA() const {return 24;}
 
 protected :
 
   complex propW;
 
 };
 
 //==========================================================================
 
 // A derived class for q qbar -> chargino+_i chargino-_j.
 
 class Sigma2qqbar2charchar : public Sigma2qqbar2chi0chi0 {
 
 public:
 
   // Constructor.
   Sigma2qqbar2charchar(int id3chiIn, int id4chiIn, int codeIn) {
 
     // Save ordering indices and process code
     id3chi   = id3chiIn;
     id4chi   = id4chiIn;
     codeSave = codeIn;
 
     // Construct id codes from ordering indices.
     id3 = (abs(id3chi) == 2) ?  1000037 :  1000024;
     id4 = (abs(id4chi) == 2) ? -1000037 : -1000024;
 
   }
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   virtual double sigmaHat();
 
 };
 
 //==========================================================================
 
 // A derived class for q g -> neutralino_i squark_j (and cc)
 
 class Sigma2qg2chi0squark : public Sigma2SUSY {
 
 public:
 
   // Constructor.
   Sigma2qg2chi0squark() : id3chi(), id4sq(), codeSave(), sigma0(),
     ui(), uj(), ti(), tj(), openFracPair() { };
 
   // Constructor.
   Sigma2qg2chi0squark(int id3chiIn, int id4sqIn, bool isUp, int codeIn) :
     sigma0(), ui(), uj(), ti(), tj(), openFracPair() {
 
     // Save ordering indices and process code
     id3chi   = id3chiIn;
     id4sq    = id4sqIn;
     codeSave = codeIn;
 
     // Construct id codes from ordering indices.
     id3                  = 1000022;
     if (id3chi == 2) id3 = 1000023;
     if (id3chi == 3) id3 = 1000025;
     if (id3chi == 4) id3 = 1000035;
     if (id3chi == 5) id3 = 1000045;
     id4                  = 1000001 + (isUp ? 1 : 0);
     if (id4sq  == 2) id4 = 1000003 + (isUp ? 1 : 0);
     if (id4sq  == 3) id4 = 1000005 + (isUp ? 1 : 0);
     if (id4sq  == 4) id4 = 2000001 + (isUp ? 1 : 0);
     if (id4sq  == 5) id4 = 2000003 + (isUp ? 1 : 0);
     if (id4sq  == 6) id4 = 2000005 + (isUp ? 1 : 0);
 
   }
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   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 "qg";}
   virtual int    id3Mass() const {return abs(id3);}
   virtual int    id4Mass() const {return abs(id4);}
   virtual bool   isSUSY()  const {return true;}
 
  protected:
 
   // Basic process information
   int     id3chi, id4sq, codeSave;
   string  nameSave;
 
   // Values stored for later use
   double  sigma0, ui, uj, ti, tj, openFracPair;
 
 
 };
 
 //==========================================================================
 
 // A derived class for q g -> chargino_i squark_j (incl cc)
 
 class Sigma2qg2charsquark : public Sigma2qg2chi0squark {
 
 public:
 
   // Constructor.
   Sigma2qg2charsquark(int id3chiIn, int id4sqIn, bool isUp, int codeIn) {
 
     // Save ordering indices and process code
     id3chi   = id3chiIn;
     id4sq    = id4sqIn;
     codeSave = codeIn;
 
     // Construct id codes from ordering indices.
     id3Sav                       = 1000024;
     if (abs(id3chi) == 2) id3Sav = 1000037;
     if (isUp)             id3Sav = -id3Sav;
     id4Sav                       = 1000001 + (isUp ? 1 : 0);
     if (id4sq  == 2) id4Sav      = 1000003 + (isUp ? 1 : 0);
     if (id4sq  == 3) id4Sav      = 1000005 + (isUp ? 1 : 0);
     if (id4sq  == 4) id4Sav      = 2000001 + (isUp ? 1 : 0);
     if (id4sq  == 5) id4Sav      = 2000003 + (isUp ? 1 : 0);
     if (id4sq  == 6) id4Sav      = 2000005 + (isUp ? 1 : 0);
 
     // Initial values, can be swapped to charge conjugates event by event.
     id3 = id3Sav;
     id4 = id4Sav;
 
   }
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   virtual double sigmaHat();
 
   // Select flavour, colour and anticolour.
   virtual void setIdColAcol();
 
  private:
 
   // Basic process information
   int id3Sav, id4Sav;
 
 };
 
 //==========================================================================
 
 // A derived class for q q' -> ~q_i ~q_j
 
 class Sigma2qq2squarksquark : public Sigma2SUSY {
 
 public:
 
   // Constructor.
   Sigma2qq2squarksquark() : id3Sav(), id4Sav(), codeSave(), iGen3(), iGen4(),
     nNeut(), isUD(), onlyQCD(), m2Glu(), sigmaChar(), sigmaNeut(), sigmaGlu(),
     sigmaCharNeut(), sigmaCharGlu(), sigmaNeutGlu(), openFracPair(), tGlu(),
     uGlu(), sumCt(), sumCu(), sumNt(), sumNu(), sumGt(), sumGu(),
                             sumInterference() {}
 
   // Constructor.
   Sigma2qq2squarksquark(int id3In, int id4In, int codeIn) : iGen3(), iGen4(),
     nNeut(), isUD(), onlyQCD(), m2Glu(), sigmaChar(), sigmaNeut(), sigmaGlu(),
     sigmaCharNeut(), sigmaCharGlu(), sigmaNeutGlu(), openFracPair(), tGlu(),
     uGlu(), sumCt(), sumCu(), sumNt(), sumNu(), sumGt(), sumGu(),
     sumInterference() {
 
     // Save ordering indices and process code
     id3Sav = id3In;
     id4Sav = id4In;
     codeSave = codeIn;
     // Initial values (flipped for c.c.)
     id3    = id3Sav;
     id4    = id4Sav;
 
   }
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   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 "qq";}
   virtual int    id3Mass() const {return abs(id3Sav);}
   virtual int    id4Mass() const {return abs(id4Sav);}
   virtual bool   isSUSY()  const {return true;}
 
 private:
 
   // Basic process information
   int     id3Sav, id4Sav, codeSave, iGen3, iGen4, nNeut;
   string  nameSave;
   bool    isUD, onlyQCD;
 
   // Storage of mass squares
   double m2Glu;
   vector<double> m2Neut, m2Char;
 
   // Flavor-independent prefactors.
   double sigmaChar, sigmaNeut, sigmaGlu;
   double sigmaCharNeut, sigmaCharGlu, sigmaNeutGlu;
   double openFracPair;
 
   // Point-by-point info
   double tGlu, uGlu;
   vector<double> tNeut, uNeut, tChar, uChar;
   double sumCt, sumCu, sumNt, sumNu, sumGt, sumGu, sumInterference;
 
 };
 
 //==========================================================================
 
 // A derived class for q qbar' -> ~q_i ~q*_j
 
 class Sigma2qqbar2squarkantisquark : public Sigma2SUSY {
 
 public:
 
   // Constructor.
   Sigma2qqbar2squarkantisquark() : id3Sav(), id4Sav(), codeSave(), iGen3(),
     iGen4(), nNeut(), isUD(), isCC(), onlyQCD(), m2Glu(), xW(), openFracPair(),
     sigmaEW(), sigmaGlu(), sigmaEWG(), tGlu(), uGlu(), sumColS(), sumColT(),
     sumInterference(){}
 
   // Constructor.
   Sigma2qqbar2squarkantisquark(int id3In, int id4In, int codeIn) : iGen3(),
     iGen4(), nNeut(), isUD(), isCC(), onlyQCD(), m2Glu(), xW(), openFracPair(),
     sigmaEW(), sigmaGlu(), sigmaEWG(), tGlu(), uGlu(), sumColS(), sumColT(),
     sumInterference(){
 
     // Save ordering indices and process code
     // (always store squark first, antisquark second)
     id3Sav = abs(id3In);
     id4Sav = -abs(id4In);
     codeSave = codeIn;
     // Initial values
     id3    = id3Sav;
     id4    = id4Sav;
 
   }
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   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 "qq";}
   virtual int    id3Mass() const {return abs(id3Sav);}
   virtual int    id4Mass() const {return abs(id4Sav);}
   virtual bool   isSUSY()  const {return true;}
 
 private:
 
   // Basic process information
   int     id3Sav, id4Sav, codeSave, iGen3, iGen4, nNeut;
   string  nameSave;
   bool    isUD, isCC, onlyQCD;
 
   // Storage of mass squares
   double m2Glu;
   vector<double> m2Neut;
 
   // Flavor-independent prefactors: EW, strong, and interference
   double xW;
   double openFracPair;
   double sigmaEW, sigmaGlu, sigmaEWG;
 
   // Point-by-point info
   double tGlu, uGlu;
   vector<double> tNeut, uNeut;
   complex propZW;
   double sumColS, sumColT, sumInterference;
 
 };
 
 //==========================================================================
 
 // A derived class for g g -> ~q ~q*
 
 class Sigma2gg2squarkantisquark : public Sigma2SUSY {
 
 public:
 
   // Constructor.
   Sigma2gg2squarkantisquark() : id3Sav(), id4Sav(), codeSave(), sigma(),
                                 m2Sq(), openFracPair() { }
 
   // Constructor.
   Sigma2gg2squarkantisquark(int id34In, int codeIn) : sigma(), m2Sq(),
     openFracPair() {
 
     // Save ordering indices and process code
     // (always store squark first, antisquark second)
     id3Sav = abs(id34In);
     id4Sav = -abs(id34In);
     codeSave = codeIn;
     // Initial values
     id3    = id3Sav;
     id4    = id4Sav;
 
   }
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   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 abs(id3Sav);}
   virtual int    id4Mass() const {return abs(id4Sav);}
   virtual bool   isSUSY()  const {return true;}
 
 private:
 
   // Basic process information
   int     id3Sav, id4Sav, codeSave;
   string  nameSave;
   double sigma, m2Sq, openFracPair;
 
 
 };
 
 //==========================================================================
 
 // A derived class for q g -> ~q ~g
 
 class Sigma2qg2squarkgluino : public Sigma2SUSY {
 
 public:
 
   // Constructor.
   Sigma2qg2squarkgluino() : codeSave(), sigmaA(), sigmaB(), comFacHat(),
     m2Glu(), m2Sq(), openFracPair() {}
 
   // Constructor.
   Sigma2qg2squarkgluino(int id3In, int codeIn) : sigmaA(), sigmaB(),
     comFacHat(), m2Glu(), m2Sq(), openFracPair() {
 
     // Save ordering indices and process code
     codeSave = codeIn;
     // Initial values
     id3    = id3In;
     id4    = 1000021;
 
   }
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   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 "qg";}
   virtual int    id3Mass() const {return abs(id3);}
   virtual int    id4Mass() const {return 1000021;}
   virtual bool   isSUSY()  const {return true;}
 
 private:
 
   // Basic process information
   int     codeSave;
   string  nameSave;
   double sigmaA, sigmaB, comFacHat, m2Glu, m2Sq, openFracPair;
 
 
 };
 
 //==========================================================================
 
 // A derived class for g g -> gluino gluino.
 
 class Sigma2gg2gluinogluino : public Sigma2SUSY {
 
 public:
 
   // Constructor.
   Sigma2gg2gluinogluino() : sigTS(), sigUS(), sigTU(), sigSum(), sigma(),
                             openFracPair() { }
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   virtual double sigmaHat() {return sigma;}
 
   // Select flavour, colour and anticolour.
   virtual void setIdColAcol();
 
   // Info on the subprocess.
   virtual string name()    const {return "g g -> gluino gluino";}
   virtual int    code()    const {return 1201;}
   virtual string inFlux()  const {return "gg";}
   virtual int    id3Mass() const {return 1000021;}
   virtual int    id4Mass() const {return 1000021;}
   virtual bool   isSUSY()  const {return true;}
 
 private:
 
   // Values stored for process type and colour flow selection.
   double sigTS, sigUS, sigTU, sigSum, sigma, openFracPair;
 
 
 };
 
 //==========================================================================
 
 // A derived class for q qbar -> gluino gluino.
 
 class Sigma2qqbar2gluinogluino : public Sigma2SUSY {
 
 public:
 
   // Constructor.
   Sigma2qqbar2gluinogluino() : openFracPair(), s34Avg(), sigS(), tHG(), uHG(),
     tHG2(), uHG2() { }
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   virtual double sigmaHat();
 
   // Select flavour, colour and anticolour.
   virtual void setIdColAcol();
 
   // Info on the subprocess.
   virtual string name()    const {return "q qbar -> gluino gluino";}
   virtual int    code()    const {return 1202;}
   virtual string inFlux()  const {return "qq";}
   virtual int    id3Mass() const {return 1000021;}
   virtual int    id4Mass() const {return 1000021;}
   virtual bool   isSUSY()  const {return true;}
 
 private:
 
   // Values stored for process type and colour flow selection.
   double openFracPair, s34Avg, sigS, tHG, uHG, tHG2, uHG2;
 
 };
 
 //==========================================================================
 
 class Sigma1qq2antisquark : public Sigma1Process {
 public:
 
   // Constructor.
   Sigma1qq2antisquark() : Sigma1Process(), mRes(), GammaRes(), m2Res(),
     sigBW(), widthOut(), codeSave(), idRes() {}
 
 
   Sigma1qq2antisquark(int id3In) : Sigma1Process(), mRes(), GammaRes(),
     m2Res(), sigBW(), widthOut(), codeSave(), idRes(id3In) {}
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   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 "qq";}
   virtual bool   isSUSY()  const {return true;}
   virtual bool   isRPV()   const {return true;}
   virtual int    resonanceA() const {return idRes;}
 
 private:
 
   // Values stored for process type and colour flow selection.
   double mRes, GammaRes, m2Res, sigBW, widthOut;
   int    codeSave, idRes;
   string nameSave;
 
 };
 
 
 //==========================================================================
 
 // A derived class for q qbar -> neutralino_i gluino.
 
 class Sigma2qqbar2chi0gluino : public Sigma2SUSY {
 
 public:
 
   // Constructor.
   Sigma2qqbar2chi0gluino() : id3chi(), id4chi(), codeSave(), sigma0(), ui(),
     uj(), ti(), tj(), openFracPair() {};
 
   // Constructor.
   Sigma2qqbar2chi0gluino(int id4chiIn, int codeIn) : id3chi(), sigma0(), ui(),
     uj(), ti(), tj(), openFracPair() {
 
     // Save ordering indices and process code
     id3   = 1000021;
     id4chi   = id4chiIn;
     codeSave = codeIn;
 
 
     // Construct id codes from ordering indices.
     id4                  = 1000022;
     if (id4chi == 2) id4 = 1000023;
     if (id4chi == 3) id4 = 1000025;
     if (id4chi == 4) id4 = 1000035;
     if (id4chi == 5) id4 = 1000045;
 
   }
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   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 nameSave;}
   virtual int    code()    const {return codeSave;}
   virtual string inFlux()  const {return "ff";}
   virtual int    id3Mass() const {return abs(id3);}
   virtual int    id4Mass() const {return abs(id4);}
   virtual int    resonanceA() const {return 23;}
   virtual bool   isSUSY()  const {return true;}
   virtual double getSigma0() const {return sigma0;}
 
  protected:
 
   // Basic process information
   int     id3chi, id4chi, codeSave;
   string  nameSave;
 
   // Values stored for later use
   double  sigma0, ui, uj, ti, tj, openFracPair;
 
 };
 
 //==========================================================================
 
 // A derived class for q qbar -> neutralino_i chargino_j.
 
 class Sigma2qqbar2chargluino : public Sigma2qqbar2chi0gluino {
 
 public:
 
   // Constructor.
   Sigma2qqbar2chargluino(int id4chiIn, int codeIn) {
 
     // Save ordering indices and process code
     id3   = 1000021;
     id4chi   = id4chiIn;
     codeSave = codeIn;
 
     // Construct id codes from ordering indices.
     id4 = (abs(id4chi) == 2) ? 1000037 : 1000024;
     if (id4chi < 0)  id4 = -id4;
   }
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   virtual double sigmaHat();
 
   // Select flavour, colour and anticolour.
   virtual void setIdColAcol();
 
   virtual int    resonanceA() const {return 24;}
 
 protected :
 
   complex propW;
 
 };
 
 //==========================================================================
 
 // A derived class for q qbar' -> ~q_i ~q*_j
 
 class Sigma2qqbar2sleptonantislepton : public Sigma2qqbar2squarkantisquark {
 
 public:
 
   // Constructor.
   Sigma2qqbar2sleptonantislepton() : id3Sav(), id4Sav(), codeSave(), iGen3(),
     iGen4(), nNeut(), isUD(), xW(), openFracPair(), sigmaEW(), sumColS(),
     sumColT(), sumInterference() {}
 
   // Constructor.
   Sigma2qqbar2sleptonantislepton(int id3In, int id4In, int codeIn) : iGen3(),
     iGen4(), nNeut(), isUD(), xW(), openFracPair(), sigmaEW(), sumColS(),
     sumColT(), sumInterference() {
 
     // Save ordering indices and process code
     // (always store squark first, antisquark second)
     id3Sav = abs(id3In);
     id4Sav = -abs(id4In);
     codeSave = codeIn;
     // Initial values
     id3    = id3Sav;
     id4    = id4Sav;
   }
 
   // Initialize process.
   virtual void initProc();
 
   // Calculate flavour-independent parts of cross section.
   virtual void sigmaKin();
 
   // Evaluate d(sigmaHat)/d(tHat).
   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 "qq";}
   virtual int    id3Mass() const {return abs(id3Sav);}
   virtual int    id4Mass() const {return abs(id4Sav);}
   virtual bool   isSUSY()  const {return true;}
 
 private:
 
   // Basic process information
   int     id3Sav, id4Sav, codeSave, iGen3, iGen4, nNeut;
   string  nameSave;
   bool    isUD;
 
   // Storage of mass squares
   vector<double> m2Neut;
 
   // Flavor-independent prefactors: EW, strong, and interference
   double xW;
   double openFracPair;
   double sigmaEW;
 
   // Point-by-point info
   vector<double> tNeut, uNeut;
   complex propZW;
   double sumColS, sumColT, sumInterference;
 
 };
 
 //==========================================================================
 
 } // end namespace Pythia8
 
 #endif // Pythia8_SigmaSUSY_H

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