singlekaon_xsec.h

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#include <iostream>
#include <iomanip>
#include <cmath>

// Class initialisation
class singlekaon_xsec {

  // Physics parameters
  double pi, amLam, am, amEta, aml, amSig, amk, ampi, Vus;

  // Input by interaction list generator
  int ilep, ik;

  // Input by the kinematics generator
  double Enu, Ekaon, pkvec;

  // SU(3) parameters, maybe in UserPhysicsOptions.xml
  double GeVtocm, fpi, d, f, g, amup, amun, Fm1, Fm2;

  // Output calculated by cross-section function
  double Elep, alepvec, aqvec, angkq, aq0;

public:

  // Threshold for given reaction
  double threshold;

  // Initialise cross-section calculation
  void init(double Etot, int type, int reac);

  // Calculate cross-section
  double diffxsec(double Tlep, double Tkaon, double theta, double phikq);

  // Calculate matrix elements
  double Amatrix_NN(double theta, double phikq);
  double Amatrix_NP(double theta, double phikq);
  double Amatrix_PP(double theta, double phikq);

};