diff --git a/MatrixElement/Hadron/MEDiffraction.h b/MatrixElement/Hadron/MEDiffraction.h
--- a/MatrixElement/Hadron/MEDiffraction.h
+++ b/MatrixElement/Hadron/MEDiffraction.h
@@ -1,330 +1,330 @@
// -*- C++ -*-
#ifndef HERWIG_MEDiffraction_H
#define HERWIG_MEDiffraction_H
//
// This is the declaration of the MEDiffraction class.
//
#include "Herwig/MatrixElement/HwMEBase.h"
#include "Herwig/Shower/UEBase.h"
namespace Herwig {
using namespace ThePEG;
/**
* The MEDiffraction class provides a simple colour singlet exchange matrix element
* to be used in the soft component of the multiple scattering model of the
* underlying event
*
* @see \ref MEDiffractionInterfaces "The interfaces"
* defined for MEDiffraction.
*/
class MEDiffraction: public HwMEBase {
public:
MEDiffraction();
/** @name Virtual functions required by the MEBase class. */
//@{
/**
* Return the order in \f$\alpha_S\f$ in which this matrix
* element is given.
*/
virtual unsigned int orderInAlphaS() const;
/**
* Return the order in \f$\alpha_{EW}\f$ in which this matrix
* element is given.
*/
virtual unsigned int orderInAlphaEW() const;
/**
* The matrix element for the kinematical configuration
* previously provided by the last call to setKinematics(), suitably
* scaled by sHat() to give a dimension-less number.
* @return the matrix element scaled with sHat() to give a
* dimensionless number.
*/
virtual double me2() const;
/**
* Correction weight to reweight the cross section to the diffractive
* cross section.
*/
double correctionweight() const;
/**
* Return the scale associated with the last set phase space point.
*/
virtual Energy2 scale() const;
/**
* Set the typed and momenta of the incoming and outgoing partons to
* be used in subsequent calls to me() and colourGeometries()
* according to the associated XComb object. If the function is
* overridden in a sub class the new function must call the base
* class one first.
*/
virtual void setKinematics();
/**
* The number of internal degrees of freedom used in the matrix
* element.
*/
virtual int nDim() const;
/**
* Generate internal degrees of freedom given nDim() uniform
* random numbers in the interval \f$ ]0,1[ \f$. To help the phase space
* generator, the dSigHatDR should be a smooth function of these
* numbers, although this is not strictly necessary.
* @param r a pointer to the first of nDim() consecutive random numbers.
* @return true if the generation succeeded, otherwise false.
*/
virtual bool generateKinematics(const double * r);
/**
* Return the matrix element squared differential in the variables
* given by the last call to generateKinematics().
*/
virtual CrossSection dSigHatDR() const;
/**
* Add all possible diagrams with the add() function.
*/
virtual void getDiagrams() const;
/**
* Get diagram selector. With the information previously supplied with the
* setKinematics method, a derived class may optionally
* override this method to weight the given diagrams with their
* (although certainly not physical) relative probabilities.
* @param dv the diagrams to be weighted.
* @return a Selector relating the given diagrams to their weights.
*/
virtual Selector<DiagramIndex> diagrams(const DiagramVector & dv) const;
/**
* Return a Selector with possible colour geometries for the selected
* diagram weighted by their relative probabilities.
* @param diag the diagram chosen.
* @return the possible colour geometries weighted by their
* relative probabilities.
*/
virtual Selector<const ColourLines *>
colourGeometries(tcDiagPtr diag) const;
//@}
/**
* Expect the incoming partons in the laboratory frame
*/
/* virtual bool wantCMS() const { return false; } */
public:
/** @name Functions used by the persistent I/O system. */
//@{
/**
* Function used to write out object persistently.
* @param os the persistent output stream written to.
*/
void persistentOutput(PersistentOStream & os) const;
/**
* Function used to read in object persistently.
* @param is the persistent input stream read from.
* @param version the version number of the object when written.
*/
void persistentInput(PersistentIStream & is, int version);
//@}
/**
* The standard Init function used to initialize the interfaces.
* Called exactly once for each class by the class description system
* before the main function starts or
* when this class is dynamically loaded.
*/
static void Init();
protected:
/** @name Standard Interfaced functions. */
//@{
/**
* Initialize this object after the setup phase before saving an
* EventGenerator to disk.
* @throws InitException if object could not be initialized properly.
*/
virtual void doinit();
/**
* Initialize this object. Called in the run phase just before a run begins.
*/
virtual void doinitrun();
//@}
/** @name Clone Methods. */
//@{
/**
* Make a simple clone of this object.
* @return a pointer to the new object.
*/
virtual IBPtr clone() const;
/** Make a clone of this object, possibly modifying the cloned object
* to make it sane.
* @return a pointer to the new object.
*/
virtual IBPtr fullclone() const;
//@}
private:
/* The matrix element squared */
double theme2;
/* Use only delta as excited state */
bool deltaOnly;
/* use correction weight for diffraction compared to inelastic weights */
bool correctionWeightSwitch;
/* allow for non-zero azimuthal and polar angles in the 1 to 2 decay */
- bool smearAngle;
+ bool smearAngle = 0;
/* manual set min mass */
double thefixedM2min;
/* Direction of the excited proton */
unsigned int diffDirection;
/* Number of clusters the dissociated proton decays into */
unsigned int dissociationDecay;
/* The mass of the consitutent quark */
Energy mq() const {return Energy(0.325*GeV);}
/* The mass of the constituent diquark */
Energy mqq() const {return Energy(0.650*GeV);}
/* The proton-pomeron slope */
double theprotonPomeronSlope;
/* The soft pomeron intercept */
double thesoftPomeronIntercept;
/* The soft pomeron slope */
double thesoftPomeronSlope;
/**
* Sample the diffractive mass squared M2 and the momentum transfer t
*/
pair<pair<Energy2,Energy2>,Energy2> diffractiveMassAndMomentumTransfer() const;
/**
* Random value for the diffractive mass squared M2 according to (M2/s0)^(-intercept)
*/
Energy2 randomM2() const;
/**
* Random value for t according to exp(diffSlope*t)
*/
Energy2 randomt(Energy2 M2) const;
/**
* Random value for t according to exp(diffSlope*t) for double diffraction
*/
Energy2 doublediffrandomt(Energy2 M12, Energy2 M22) const;
/**
* Returns the momenta of the two-body decay of momentum pp
*/
//pair<Lorentz5Momentum,Lorentz5Momentum> twoBodyDecayMomenta(Lorentz5Momentum pp) const;
bool twoBodyDecayMomenta(const Lorentz5Momentum & p,
const Energy m1, const Energy m2,
Lorentz5Momentum & p1, Lorentz5Momentum & p2);
/**
* Returns the proton-pomeron slope
*/
InvEnergy2 protonPomeronSlope() const;
/**
* Returns the soft pomeron intercept
*/
double softPomeronIntercept() const;
//M12 and M22 are masses squared of
//outgoing particles
/**
* Returns the minimal possible value of momentum transfer t given the center
* of mass energy and diffractive masses
*/
Energy2 tminfun(Energy2 s, Energy2 M12, Energy2 M22) const;
/**
* Returns the maximal possible value of momentum transfer t given the center
* of mass energy and diffractive masses
*/
Energy2 tmaxfun(Energy2 s , Energy2 M12, Energy2 M22) const;
/**
* Returns the minimal possible value of diffractive mass
*/
//lowest possible mass given the constituent masses of quark and diquark
Energy2 M2min() const;
/**
* Returns the maximal possible value of diffractive mass
*/
Energy2 M2max() const;
//TODO:modify to get proper parameters
InvEnergy2 softPomeronSlope() const;
/**
* Allows for a fixed m2 value
*/
Energy2 fixedM2min() const;
/* Kallen function */
template<typename A, typename B, typename C>
auto kallen(A a, B b, C c) const -> decltype(a*a)
{
return a*a + b*b + c*c - 2.0*(a*b + b*c + c*a);
}
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
MEDiffraction & operator=(const MEDiffraction &) = delete;
bool isInRunPhase;
/* The proton mass */
Energy theProtonMass;
/**
* a MPIHandler to administer the creation of several (semihard)
* partonic interactions.
*/
UEBasePtr MPIHandler_;
};
}
#endif /* HERWIG_MEDiffraction_H */