Date of Original Version

2008

Type

Article

Abstract or Table of Contents

We measure the mass of the η meson using ψ(2S)→π+π-J/ψ, J/ψ→γη events acquired with the CLEO-c detector operating at the CESR e+e- collider. Using three decay modes, η→ρ0γ, η→π+π-η with η→γγ, and η→π+π-η with η→π+π-π0, we find Mη=957.793±0.054±0.036   MeV, in which the uncertainties are statistical and systematic, respectively. This result is consistent with but substantially more precise than the current world average.

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