EIC code displayed by LXR master/​include/​Herwig/​Decay/​Baryon/​SU3BaryonOctetOctetPhotonDecayer.h	Source navigation Diff markup Identifier search General search
	Version: master test Revert   Change

File indexing completed on 2026-08-06 09:23:59

 // -*- C++ -*-
 #ifndef HERWIG_SU3BaryonOctetOctetPhotonDecayer_H
 #define HERWIG_SU3BaryonOctetOctetPhotonDecayer_H
 // This is the declaration of the SU3BaryonOctetOctetPhotonDecayer class.
 
 #include "Baryon1MesonDecayerBase.h"
 
 namespace Herwig {
 using namespace ThePEG;
 
 /** \ingroup Decay
  *
  *  The <code>SU3BaryonOctetOctetPhotonDecayer</code> class performs the decay of 
  *  a baryon octet to a different baryon octet and a photon.
  *
  *  The Lagrangian is taken to be
  * \f[
  *  ir_d\left[ {\rm tr}\left(\bar{R}\sigma_{\mu\nu}\{f^{\mu\nu}_+,B\}\right)
  *            +{\rm tr}\left(\bar{B}\sigma_{\mu\nu}\{f^{\mu\nu}_+,R\}\right)
  *            \right]
  * +ir_f\left[ {\rm tr}\left(\bar{R}\sigma_{\mu\nu}[f^{\mu\nu}_+,B] \right)
  *            +{\rm tr}\left(\bar{B}\sigma_{\mu\nu}[f^{\mu\nu}_+,R] \right)
  *            \right],
  * \f]
  *  where \f$B\f$ is the matrix field for the ground state baryon multiplet, \f$R\f$
  *  is the 
  *  matrix field for the excited baryon multiplet and \f$f^{\mu\nu}_+\f$ is the chiral
  * field strength tensor for the electromagentic field given by
  * \f[ f^{\mu\nu}_+ = Q F^{\mu\nu} = \left(\begin{array}{ccc}\frac23&0&0\\
  *                                                           0&-\frac13&0\\
  *                                                           0&0&-\frac13
  *     \end{array}\right) F^{\mu\nu},\f]
  * where \f$F^{\mu\nu}\f$ is the electromagentic field strength tensor.
  * This form is used for the case where both baryon multiplets have the same parity and
  * an additional \f$\gamma_5\f$ is added for the case where the multiplets have 
  * opposite parity.
  *
  * For the decay of spin-\f$\frac32\f$ baryons we use the form
  * \f[
  *  ir_d\left[ {\rm tr}\left(\bar{R}^\mu\gamma_\nu\{f^{\mu\nu}_+,B\}\right)
  *            +{\rm tr}\left(\bar{B}\gamma_\nu\{f^{\mu\nu}_+,R^\mu\}\right)
  *            \right]
  * +ir_f\left[ {\rm tr}\left(\bar{R}^\mu\gamma_\nu[f^{\mu\nu}_+,B] \right)
  *            +{\rm tr}\left(\bar{B}\gamma_\nu[f^{\mu\nu}_+,R^\mu] \right)
  *            \right],
  * \f]
  *  where \f$R^\mu\f$ is the matrix field for the excited baryon multiplet.
  *  This form is used when the baryon's have the same parity and this form with
  *  an additional \f$\gamma_5\f$ when they have opposite parity.
  *
  *  This is one of a number of decayers based on \f$SU(3)\f$ symmetry which are
  *  intended for the decay of excited baryons.
  *
  * @see Baryon1MesonDecayerBase
  * @see SU3BaryonOctetOctetPhotonDecayer
  * @see SU3BaryonDecupletOctetPhotonDecayer
  * @see SU3BaryonDecupletOctetScalarDecayer
  * @see SU3BaryonSingletOctetPhotonDecayer
  * @see SU3BaryonSingletOctetScalarDecayer
  * @see SU3BaryonOctetDecupletScalarDecayer
  * @see SU3BaryonOctetOctetScalarDecayer
  * 
  */
 class SU3BaryonOctetOctetPhotonDecayer: public Baryon1MesonDecayerBase {
 
 public:
 
   /**
    * Default constructor.
    */
   SU3BaryonOctetOctetPhotonDecayer();
 
   /**
    * Which of the possible decays is required
    * @param cc Is this mode the charge conjugate
    * @param parent The decaying particle
    * @param children The decay products
    */
   virtual int modeNumber(bool & cc, tcPDPtr parent, 
              const tPDVector & children) const;
 
   /**
    * Output the setup information for the particle database
    * @param os The stream to output the information to
    * @param header Whether or not to output the information for MySQL
    */
   virtual void dataBaseOutput(ofstream & os,bool header) const;
 
 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);
   //@}
 
   /**
    * Standard Init function used to initialize the interfaces.
    */
   static void Init();
 
 protected:
 
   /**
    *  Coupling Members.
    */
   //@{
   /**
    * Couplings for spin-\f$\frac12\f$ to spin-\f$\frac12\f$ and a vector.
    * @param imode The mode
    * @param m0 The mass of the decaying particle.
    * @param m1 The mass of the outgoing baryon.
    * @param m2 The mass of the outgoing meson.
    * @param A1 The coupling \f$A_1\f$ described above.
    * @param A2 The coupling \f$A_2\f$ described above.
    * @param B1 The coupling \f$B_1\f$ described above.
    * @param B2 The coupling \f$B_2\f$ described above.
    */
   virtual void halfHalfVectorCoupling(int imode,Energy m0,Energy m1,Energy m2,
                       Complex& A1,Complex& A2,
                       Complex& B1,Complex& B2) const;
 
   /**
    * Couplings for spin-\f$\frac12\f$ to spin-\f$\frac32\f$ and a vector.
    * @param imode The mode
    * @param m0 The mass of the decaying particle.
    * @param m1 The mass of the outgoing baryon.
    * @param m2 The mass of the outgoing meson.
    * @param A1 The coupling \f$A_1\f$ described above.
    * @param A2 The coupling \f$A_2\f$ described above.
    * @param A3 The coupling \f$A_3\f$ described above.
    * @param B1 The coupling \f$B_1\f$ described above.
    * @param B2 The coupling \f$B_2\f$ described above.
    * @param B3 The coupling \f$B_3\f$ described above.
    */
   virtual void threeHalfHalfVectorCoupling(int imode,Energy m0,Energy m1,Energy m2,
                        Complex& A1,Complex& A2,Complex& A3,
                        Complex& B1,Complex& B2,Complex& B3) const;
   //@}
 
 protected:
 
   /** @name Clone Methods. */
   //@{
   /**
    * Make a simple clone of this object.
    * @return a pointer to the new object.
    */
   virtual IBPtr clone() const {return new_ptr(*this);}
 
   /** 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 {return new_ptr(*this);}
   //@}
 
 protected:
 
   /** @name Standard Interfaced functions. */
   //@{
 
   /**
    * Initialize this object after the setup phase before saving and
    * EventGenerator to disk.
    * @throws InitException if object could not be initialized properly.
    */
   virtual void doinit();
 
   /**
    * Initialize this object to the begining of the run phase.
    */
   virtual void doinitrun();
   //@}
 
 private:
 
   /**
    * Private and non-existent assignment operator.
    */
   SU3BaryonOctetOctetPhotonDecayer & 
   operator=(const SU3BaryonOctetOctetPhotonDecayer &) = delete;
 
 private:
 
   /**
    * set-up the modes
    */
   void setupModes(unsigned int) const;
 
 private:
 
   /**
    * The couplings of comutator term.
    */
   InvEnergy _lf;
 
   /**
    * The couplings of anticomutator term.
    */
   InvEnergy _ld;
 
   /**
    * the relative parities of the two baryon multiplets
    */
   bool _parity;
 
   /**
    * PDG codes for the lower lying baryon octet baryons
    */
   //@{
   /**
    *  The PDG code for the \f$p\f$-like member of the outgoing octet.
    */
   int _proton;
 
   /**
    *  The PDG code for the \f$n\f$-like member of the outgoing octet.
    */
   int _neutron;
 
   /**
    *  The PDG code for the \f$\Sigma^0\f$-like member of the outgoing octet.
    */
   int _sigma0;
 
   /**
    *  The PDG code for the  \f$\Sigma^+\f$-like member of the outgoing octet.
    */
   int _sigmap;
 
   /**
    *  The PDG code for the  \f$\Sigma^-\f$-like member of the outgoing octet.
    */
   int _sigmam;
 
   /**
    *  The PDG code for the \f$\Sigma^0\f$-like member of the outgoing octet.
    */
   int _lambda;
 
   /**
    *  The PDG code for the \f$\Xi^0\f$-like member of the outgoing octet.
    */
   int _xi0;
 
   /**
    *  The PDG code for the \f$\Xi^-\f$-like member of the outgoing octet.
    */
   int _xim;
   //@}
 
 
   /**
    * PDG codes for the higher  baryon octet baryons
    */
   //@{
   /**
    *  The PDG code for the \f$p\f$-like member of the outgoing octet.
    */
   int _eproton;
 
   /**
    *  The PDG code for the \f$n\f$-like member of the outgoing octet.
    */
   int _eneutron;
 
   /**
    *  The PDG code for the \f$\Sigma^0\f$-like member of the outgoing octet.
    */
   int _esigma0;
 
   /**
    *  The PDG code for the  \f$\Sigma^+\f$-like member of the outgoing octet.
    */
   int _esigmap;
 
   /**
    *  The PDG code for the  \f$\Sigma^-\f$-like member of the outgoing octet.
    */
   int _esigmam;
 
   /**
    *  The PDG code for the \f$\Sigma^0\f$-like member of the outgoing octet.
    */
   int _elambda;
 
   /**
    *  The PDG code for the \f$\Xi^0\f$-like member of the outgoing octet.
    */
   int _exi0;
 
   /**
    *  The PDG code for the \f$\Xi^-\f$-like member of the outgoing octet.
    */
   int _exim;
   //@}
 
   /**
    * PDG code for the incoming baryons
    */
   mutable vector<int> _incomingB;
 
   /**
    * PDG code for the outgoing baryons
    */
   mutable vector<int> _outgoingB;
 
   /**
    * the maximum weight for the various modes
    */
   vector<double> _maxweight;
 
   /**
    * The couplings for the different modes.
    */
   mutable vector<InvEnergy> _prefactor;
 };
 
 }
 
 
 #endif /* HERWIG_SU3BaryonOctetOctetPhotonDecayer_H */

This page was automatically generated by the 2.3.7 LXR engine. The LXR team