Matchbox/Phasespace/IFLightTildeKinematics.h

0001 // -*- C++ -*-
0002 //
0003 // IFLightTildeKinematics.h is a part of Herwig - A multi-purpose Monte Carlo event generator
0004 // Copyright (C) 2002-2019 The Herwig Collaboration
0005 //
0006 // Herwig is licenced under version 3 of the GPL, see COPYING for details.
0007 // Please respect the MCnet academic guidelines, see GUIDELINES for details.
0008 //
0009 #ifndef HERWIG_IFLightTildeKinematics_H
0010 #define HERWIG_IFLightTildeKinematics_H
0011 //
0012 // This is the declaration of the IFLightTildeKinematics class.
0013 //
0014
0015 #include "Herwig/MatrixElement/Matchbox/Phasespace/TildeKinematics.h"
0016
0017 namespace Herwig {
0018
0019 using namespace ThePEG;
0020
0021 /**
0022  * \ingroup Matchbox
0023  * \author Simon Platzer
0024  *
0025  * \brief IFLightTildeKinematics implements the 'tilde' kinematics for
0026  * a initial-final subtraction dipole.
0027  *
0028  */
0029 class IFLightTildeKinematics: public TildeKinematics {
0030
0031 public:
0032
0033   /**
0034    * Perform the mapping to the tilde kinematics for the
0035    * last selected process and store all dimensionless
0036    * variables in the subtractionParameters() vector.
0037    * Return false, if the calculation of the tilde
0038    * kinematics was impossible for the selected configuration
0039    * and true on success.
0040    */
0041   virtual bool doMap();
0042
0043   /**
0044    * Return the pt associated to the last merged splitting.
0045    */
0046   virtual Energy lastPt() const;
0047
0048   /**
0049    * Return the pt associated to emitter emission and sppectator momentum.
0050    */
0051   virtual Energy lastPt(Lorentz5Momentum,Lorentz5Momentum,Lorentz5Momentum) const ;
0052
0053
0054   /**
0055    * Return the momentum fraction associated to the last splitting.
0056    */
0057   virtual double lastZ() const;
0058
0059   /**
0060    * Given a pt, return the boundaries on z
0061    */
0062   virtual pair<double,double> zBounds(Energy pt, Energy hardPt ) const;
0063
0064   /*
0065    * True if phase space point is above the alpha cut for this dipole.
0066    */
0067
0068   bool aboveAlpha() const {return dipole()->alpha()<subtractionParameters()[1];}
0069
0070
0071 public:
0072
0073   /** @name Functions used by the persistent I/O system. */
0074   //@{
0075   /**
0076    * Function used to write out object persistently.
0077    * @param os the persistent output stream written to.
0078    */
0079   void persistentOutput(PersistentOStream & os) const;
0080
0081   /**
0082    * Function used to read in object persistently.
0083    * @param is the persistent input stream read from.
0084    * @param version the version number of the object when written.
0085    */
0086   void persistentInput(PersistentIStream & is, int version);
0087   //@}
0088
0089   /**
0090    * The standard Init function used to initialize the interfaces.
0091    * Called exactly once for each class by the class description system
0092    * before the main function starts or
0093    * when this class is dynamically loaded.
0094    */
0095   static void Init();
0096
0097 protected:
0098
0099   /** @name Clone Methods. */
0100   //@{
0101   /**
0102    * Make a simple clone of this object.
0103    * @return a pointer to the new object.
0104    */
0105   virtual IBPtr clone() const;
0106
0107   /** Make a clone of this object, possibly modifying the cloned object
0108    * to make it sane.
0109    * @return a pointer to the new object.
0110    */
0111   virtual IBPtr fullclone() const;
0112   //@}
0113
0114
0115 // If needed, insert declarations of virtual function defined in the
0116 // InterfacedBase class here (using ThePEG-interfaced-decl in Emacs).
0117
0118
0119 private:
0120
0121   /**
0122    * The assignment operator is private and must never be called.
0123    * In fact, it should not even be implemented.
0124    */
0125   IFLightTildeKinematics & operator=(const IFLightTildeKinematics &) = delete;
0126
0127 };
0128
0129 }
0130
0131 #endif /* HERWIG_IFLightTildeKinematics_H */