850 K 32 pp. | ||

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Title | Some Comments on the Decays of eta (550) | |

Author(s) | Veltman, M.; Yellin, J. | |

Publication Date | July 1966 | |

Report Number | BNL--10396 | |

Unique Identifier | ACC0154 | |

Other Numbers | OSTI ID: 4435257 | |

Research Org | Brookhaven National Laboratory, Upton, N. Y. | |

Contract No | AT(30-2)-Gen-16 | |

Sponsoring Org | U. S. Atomic Energy Commission (AEC) | |

Subject | N34220 -- Physics (High Energy) -- Particle Interactions & Properties (Theoretical) -- Electromagnetic; Branching Ratio; Charge Conjugation; Conservation Law; Dalitz Plot; Decay; Elementary Particles; Eta Resonances; Group Theory; Isospin; Photons; Pions; Quantum Mechanics; Resonance; Selection Rules; SU Group; SU-3 Group; Transients | |

Keywords | Particle Physics | |

Related Web Pages | Martinus Veltman, the Electroweak Theory,and Elementary Particle Physics | |

Abstract | Various decay modes of the {eta}(500) are discussed. The relations, through SU{sub 3} and the Gell-Mann, Sharp, Wagner model, between the {eta}-decay modes and the modes {eta} {yields} {pi}{pi}{gamma), {pi}{sup 0} {yields} {gamma}{gamma} are investigated taking into account {eta}-{eta}{sup *} mixing. The present experimental values for the neutral branching ratios plus the shape of the {eta} {yields} {pi}{sup +}{pi}{sup {minus}}{pi}{sup 0} Dalitz plot are shown to require a 25% {vert_bar}{Delta}{rvec I}{vert_bar} = 3 contribution to the {eta} {yields} 3{pi} amplitude. The connection between a possible charge asymmetry in {eta} {yields} {pi}{sup +}{pi}{sup {minus}}{pi}{sup 0} and the branching ratio {Gamma}{sub {eta} {yields} {pi}{sup 0}e{sup +}e{sup {minus}}}/{Gamma}{sub {eta}}{sup all} is investigated in the framework of a model proposed earlier by several authors. It is shown that there is no conflict between the existing data and this model. The Dalitz plot distribution of {eta} {yields} {pi}{sup +}{pi}{sup {minus}}{pi}{sup 0} is discussed under various assumptions about the properties of the interaction responsible for the decay. (auth) | |

850 K 32 pp. | ||

View Document | ||