Search for Rare and Forbidden η Decays

R. A. Briere et al. (CLEO Collaboration)
Phys. Rev. Lett. 84, 26 – Published 3 January 2000
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Abstract

We have searched for rare and forbidden decays of the η meson in hadronic events at the CLEO II detector. The search is conducted on 4.80 fb1 of e+e collisions at 10.6 GeV center-of-mass energy at the Cornell Electron Storage Ring. We find no signals, and set 90% confidence level upper limits of their branching fractions: B(ηe+eη)<2.4×103, B(ηe+eπ0)<1.4×103, B(ηe+eγ)<0.9×103, and B(ηeμ)<4.7×104. We also fit the matrix element of the ηπ+πη Dalitz plot with the parametrization |M|2=A|1+αy|2, where y is a linear function of the kinetic energy of the η, and find Re (α)=0.021±0.025.

  • Received 22 July 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.26

©2000 American Physical Society

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Vol. 84, Iss. 1 — 3 January 2000

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