/usr/include/Pythia8/Pythia8/SigmaCompositeness.h is in libpythia8-dev 8.1.86-1.2.
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// Copyright (C) 2014 Torbjorn Sjostrand.
// PYTHIA is licenced under the GNU GPL version 2, see COPYING for details.
// Please respect the MCnet Guidelines, see GUIDELINES for details.
// Header file for compositiness-process differential cross sections.
// Contains classes derived from SigmaProcess via Sigma(1/2)Process.
#ifndef Pythia8_SigmaCompositeness_H
#define Pythia8_SigmaCompositeness_H
#include "Pythia8/SigmaProcess.h"
namespace Pythia8 {
//==========================================================================
// A derived class for q g -> q^* (excited quark state).
class Sigma1qg2qStar : public Sigma1Process {
public:
// Constructor.
Sigma1qg2qStar(int idqIn) : idq(idqIn) {}
// 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 q* decay angles (else inactive).
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 "qg";}
virtual int resonanceA() const {return idRes;}
private:
// Parameters set at initialization or for current kinematics.
int idq, idRes, codeSave;
string nameSave;
double mRes, GammaRes, m2Res, GamMRat, Lambda, coupFcol, widthIn, sigBW;
// Pointer to properties of the particle species, to access decay channels.
ParticleDataEntry* qStarPtr;
};
//==========================================================================
// A derived class for l gamma -> l^* (excited lepton state).
class Sigma1lgm2lStar : public Sigma1Process {
public:
// Constructor.
Sigma1lgm2lStar(int idlIn) : idl(idlIn) {}
// 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 l* decay angles (else inactive).
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 "fgm";}
virtual int resonanceA() const {return idRes;}
private:
// Parameters set at initialization or for current kinematics.
int idl, idRes, codeSave;
string nameSave;
double mRes, GammaRes, m2Res, GamMRat, Lambda, coupChg, widthIn, sigBW;
// Pointer to properties of the particle species, to access decay channels.
ParticleDataEntry* qStarPtr;
};
//==========================================================================
// A derived class for q q' -> q^* q' (excited quark state).
class Sigma2qq2qStarq : public Sigma2Process {
public:
// Constructor.
Sigma2qq2qStarq(int idqIn) : idq(idqIn) {}
// 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 q* decay angles (else inactive).
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 "qq";}
virtual int id3Mass() const {return idRes;}
private:
// Parameters set at initialization or for current kinematics.
int idq, idRes, codeSave;
string nameSave;
double Lambda, preFac, openFracPos, openFracNeg, sigmaA, sigmaB;
};
//==========================================================================
// A derived class for q qbar -> l^* lbar (excited lepton state).
class Sigma2qqbar2lStarlbar : public Sigma2Process {
public:
// Constructor.
Sigma2qqbar2lStarlbar(int idlIn) : idl(idlIn) {}
// 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();
// Evaluate weight for l* decay angles (else inactive).
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 "qqbarSame";}
virtual int id3Mass() const {return idRes;}
private:
// Parameters set at initialization or for current kinematics.
int idl, idRes, codeSave;
string nameSave;
double Lambda, preFac, openFracPos, openFracNeg, sigma;
};
//==========================================================================
// A derived class for q q -> q q (quark contact interactions).
// Based on, Sigma2qq2qq (QCD).
class Sigma2QCqq2qq : public Sigma2Process {
public:
// Constructor.
Sigma2QCqq2qq(){}
// 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 q(bar)' -> (QC) -> q q(bar)'";}
virtual int code() const {return 4201;}
virtual string inFlux() const {return "qq";}
private:
// Values stored for colour flow selection.
double sigT, sigU, sigTU, sigST, sigSum, sigQCSTU, sigQCUTS;
// Compositeness parameters.
double qCLambda2;
int qCetaLL, qCetaRR, qCetaLR;
};
//==========================================================================
// A derived class for q qbar -> q' qbar' (quark contact interactions).
// Based on, Sigma2qqbar2qqbarNew(QCD).
// Note: This process give the same contributions for q == q' and q != q'.
class Sigma2QCqqbar2qqbar : public Sigma2Process {
public:
// Constructor.
Sigma2QCqqbar2qqbar(){}
// 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 "q qbar -> (QC) -> q' qbar' (uds)";}
virtual int code() const {return 4202;}
virtual string inFlux() const {return "qqbarSame";}
private:
// Number of outgoing quark flavours to be considered, given that
// matrix elements are calculated in the massless approximation.
int qCnQuarkNew;
// Values stored for colour flow selection.
int idNew;
double mNew, m2New, sigS, sigma;
// Compositeness parameters.
double qCLambda2;
int qCetaLL, qCetaRR, qCetaLR;
};
//==========================================================================
// A derived class for f fbar -> l lbar
// (contact interactions).
// Does not include t-channel contributions relevant for e^+e^- to e^+e^-
class Sigma2QCffbar2llbar : public Sigma2Process {
public:
// Constructor: bool Graviton = true, to use LED graviton settings.
Sigma2QCffbar2llbar (int idIn, int codeIn) : idNew(idIn), codeNew(codeIn) {}
// Initialize process.
virtual void initProc();
// Calculate flavour-independent parts of cross section;
// first step when inflavours unknown.
virtual void sigmaKin();
// Evaluate sigmaHat(sHat); second step for given inflavours.
virtual double sigmaHat();
// Select flavour, colour and anticolour.
virtual void setIdColAcol();
// Info on the subprocess.
virtual string name() const {return nameNew;}
virtual int code() const {return codeNew;}
virtual string inFlux() const {return "ffbarSame";}
virtual bool isSChannel() const {return true;}
private:
// Process values.
string nameNew;
int idNew, codeNew;
double qCmNew, qCmNew2, qCmZ, qCmZ2, qCGZ, qCGZ2, sigma0;
// Compositeness parameters.
double qCLambda2;
int qCetaLL, qCetaRR, qCetaLR;
double qCPropGm, qCrePropZ, qCimPropZ;
};
//==========================================================================
} // end namespace Pythia8
#endif // Pythia8_SigmaCompositeness_H
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