Some Comments on the Decays of η (550)

Phys. Rev. 154, 1469 – Published 25 February 1967
M. Veltman and Joel Yellin


Various decay modes of the η(550) are discussed. The relations, through SU3 and the Gell-Mann-Sharp-Wagner model, between the η-decay modes and the modes ηππγ, π0γγ are investigated, taking into account η-η* mixing. The present experimental values for the neutral branching ratios plus the shape of the ηπ+π-π0 Dalitz plot are shown to require a 30% |ΔI|=3 contribution to the η3π amplitude. The connection between a possible charge asymmetry in ηπ+π-π0 and branching ratio Γηπ0e*e*Γηall 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 ηπ+π-π0 is discussed under various assumptions about the properties of the interaction responsible for the decay.


  • Received 13 July 1966
  • Published in the issue dated February 1967

© 1967 The American Physical Society

Authors & Affiliations

M. Veltman* and Joel Yellin

  • Brookhaven National Laboratory, Upton, New York

  • *Permanent address: CERN, Geneva, Switzerland.
  • Present address: Physics Department, University of Tel-Aviv, Tel-Aviv, Israel.

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