QTilde/SplittingFunctions/PTCutOff.h

0001 // -*- C++ -*-
0002 #ifndef Herwig_PTCutOff_H
0003 #define Herwig_PTCutOff_H
0004 //
0005 // This is the declaration of the PTCutOff class.
0006 //
0007
0008 #include "SudakovCutOff.h"
0009
0010 namespace Herwig {
0011
0012 using namespace ThePEG;
0013
0014 /**
0015  * Here is the documentation of the PTCutOff class.
0016  *
0017  * @see \ref PTCutOffInterfaces "The interfaces"
0018  * defined for PTCutOff.
0019  */
0020 class PTCutOff: public SudakovCutOff {
0021
0022 public:
0023
0024   /**
0025    *  Calculate the virtual masses for a branchings
0026    */
0027   virtual const vector<Energy> & virtualMasses(const IdList & ids);
0028
0029   /**
0030    * Default pTmin
0031    */
0032   virtual Energy pTmin() { return pTmin_; }
0033
0034   /**
0035    * Default pT2min
0036    */
0037   virtual Energy2 pT2min() { return pT2min_; }
0038
0039
0040 public:
0041
0042   /** @name Functions used by the persistent I/O system. */
0043   //@{
0044   /**
0045    * Function used to write out object persistently.
0046    * @param os the persistent output stream written to.
0047    */
0048   void persistentOutput(PersistentOStream & os) const;
0049
0050   /**
0051    * Function used to read in object persistently.
0052    * @param is the persistent input stream read from.
0053    * @param version the version number of the object when written.
0054    */
0055   void persistentInput(PersistentIStream & is, int version);
0056   //@}
0057
0058   /**
0059    * The standard Init function used to initialize the interfaces.
0060    * Called exactly once for each class by the class description system
0061    * before the main function starts or
0062    * when this class is dynamically loaded.
0063    */
0064   static void Init();
0065
0066 protected:
0067
0068   /** @name Standard Interfaced functions. */
0069   //@{
0070   /**
0071    * Initialize this object after the setup phase before saving an
0072    * EventGenerator to disk.
0073    * @throws InitException if object could not be initialized properly.
0074    */
0075   virtual void doinit();
0076   //@}
0077
0078 protected:
0079
0080   /** @name Clone Methods. */
0081   //@{
0082   /**
0083    * Make a simple clone of this object.
0084    * @return a pointer to the new object.
0085    */
0086   virtual IBPtr clone() const;
0087
0088   /** Make a clone of this object, possibly modifying the cloned object
0089    * to make it sane.
0090    * @return a pointer to the new object.
0091    */
0092   virtual IBPtr fullclone() const;
0093   //@}
0094
0095 private:
0096
0097   /**
0098    * The assignment operator is private and must never be called.
0099    * In fact, it should not even be implemented.
0100    */
0101   PTCutOff & operator=(const PTCutOff &) = delete;
0102
0103 private:
0104
0105   /**
0106    *  Parameters for the \f$p_T\f$ cut-off
0107    */
0108   //@{
0109   /**
0110    *  The minimum \f$p_T\f$ for the branching
0111    */
0112   Energy pTmin_ = 1_GeV;
0113
0114   /**
0115    *  The square of the minimum \f$p_T\f$
0116    */
0117   Energy2 pT2min_ = 1_GeV2;
0118   //@}
0119
0120
0121 };
0122
0123 }
0124
0125 #endif /* Herwig_PTCutOff_H */