Decay/FormFactors/AnalyticOmnesFunction.h

0001 // -*- C++ -*-
0002 #ifndef Herwig_AnalyticOmnesFunction_H
0003 #define Herwig_AnalyticOmnesFunction_H
0004 //
0005 // This is the declaration of the AnalyticOmnesFunction class.
0006 //
0007
0008 #include "OmnesFunction.h"
0009
0010 namespace Herwig {
0011
0012 using namespace ThePEG;
0013
0014 /**
0015  * Here is the documentation of the AnalyticOmnesFunction class.
0016  *
0017  * @see \ref AnalyticOmnesFunctionInterfaces "The interfaces"
0018  * defined for AnalyticOmnesFunction.
0019  */
0020 class AnalyticOmnesFunction: public OmnesFunction {
0021
0022 public:
0023
0024   /**
0025    * The default constructor.
0026    */
0027   AnalyticOmnesFunction() : fPi_(130.7*MeV), mRho_(0.7711*GeV),
0028                 rhoWidth_(0.1492*GeV), rhoConst_(0.), mPi_(ZERO),
0029                 localParameters_(true)
0030   {}
0031
0032   /**
0033    *  Method to return the function value
0034    */
0035   virtual Complex D(Energy2 s) const;
0036
0037   /**
0038    * Output the setup information for the particle database
0039    * @param os The stream to output the information to
0040    * @param header Whether or not to output the information for MySQL
0041    * @param create Whether or not to add a statement creating the object
0042    */
0043   virtual void dataBaseOutput(ofstream & os,bool header,bool create) const;
0044
0045 public:
0046
0047   /** @name Functions used by the persistent I/O system. */
0048   //@{
0049   /**
0050    * Function used to write out object persistently.
0051    * @param os the persistent output stream written to.
0052    */
0053   void persistentOutput(PersistentOStream & os) const;
0054
0055   /**
0056    * Function used to read in object persistently.
0057    * @param is the persistent input stream read from.
0058    * @param version the version number of the object when written.
0059    */
0060   void persistentInput(PersistentIStream & is, int version);
0061   //@}
0062
0063   /**
0064    * The standard Init function used to initialize the interfaces.
0065    * Called exactly once for each class by the class description system
0066    * before the main function starts or
0067    * when this class is dynamically loaded.
0068    */
0069   static void Init();
0070
0071 protected:
0072
0073   /** @name Clone Methods. */
0074   //@{
0075   /**
0076    * Make a simple clone of this object.
0077    * @return a pointer to the new object.
0078    */
0079   virtual IBPtr clone() const;
0080
0081   /** Make a clone of this object, possibly modifying the cloned object
0082    * to make it sane.
0083    * @return a pointer to the new object.
0084    */
0085   virtual IBPtr fullclone() const;
0086   //@}
0087 protected:
0088
0089   /** @name Standard Interfaced functions. */
0090   //@{
0091   /**
0092    * Initialize this object after the setup phase before saving an
0093    * EventGenerator to disk.
0094    * @throws InitException if object could not be initialized properly.
0095    */
0096   virtual void doinit();
0097   //@}
0098
0099
0100 private:
0101
0102   /**
0103    * The assignment operator is private and must never be called.
0104    * In fact, it should not even be implemented.
0105    */
0106   AnalyticOmnesFunction & operator=(const AnalyticOmnesFunction &) = delete;
0107
0108 private:
0109
0110   /**
0111    * the pion decay constant, \f$F_\pi\f$.
0112    */
0113   Energy fPi_;
0114
0115   /**
0116    * The \f$\rho\f$ mass
0117    */
0118   Energy mRho_;
0119
0120   /**
0121    * The \f$\rho\f$ width
0122    */
0123   Energy rhoWidth_;
0124
0125   /**
0126    * Constant for the running \f$rho\f$ width.
0127    */
0128   double rhoConst_;
0129
0130   /**
0131    * The \f$m_\pi\f$.
0132    */
0133   Energy mPi_;
0134
0135   /**
0136    * Use local values of the parameters.
0137    */
0138   bool localParameters_;
0139
0140 };
0141
0142 }
0143
0144 #endif /* Herwig_AnalyticOmnesFunction_H */