Measurement of the η-Meson Mass Using ψ(2S)ηJ/ψ

D. H. Miller et al. (CLEO Collaboration)
Phys. Rev. Lett. 99, 122002 – Published 18 September 2007

Abstract

We measure the mass of the η meson using ψ(2S)ηJ/ψ events acquired with the CLEO-c detector operating at the CESR e+e collider. Using the four decay modes ηγγ, 3π0, π+ππ0, and π+πγ, we find Mη=547.785±0.017±0.057MeV, in which the first uncertainty is statistical and the second systematic. This result has an uncertainty comparable to the two most precise previous measurements and is consistent with that of NA48, but is inconsistent at the level of 6.5σ with the much smaller mass obtained by GEM.

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  • Received 12 July 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.122002

©2007 American Physical Society

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See Also

Measurement of Prominent η-Decay Branching Fractions

A. Lopez et al. (CLEO Collaboration)
Phys. Rev. Lett. 99, 122001 (2007)

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Vol. 99, Iss. 12 — 21 September 2007

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