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Phys. Rev. D 56, 5359–5365 (1997)

New upper limit on the decay ηe+e-

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T. E. Browder et al. (CLEO Collaboration)
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Received 3 June 1997; published in the issue dated 1 November 1997

We have searched for the rare decay of the η meson ηe+e- using the CLEO II detector. The η’s were produced in e+e- collisions with 10 GeV center-of-mass energy at the Cornell Electron Storage Ring (CESR). We find with 90% confidence the upper limit on the branching fraction B(ηe+e-)<7.7×10-5. The application of conventional elementary particle theory to this decay predicts a branching fraction of about 10-9.

© 1997 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.56.5359
DOI:
10.1103/PhysRevD.56.5359
PACS:
14.40.Aq, 13.40.Hq