APS » PROLA » Phys. Rev. Lett. » Volume 87 » Issue 14

Phys. Rev. Lett. 87, 141801 (2001) [4 pages]

Search for the Decay ϒ(1S) → γη′
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S. J. Richichi et al. (CLEO Collaboration)
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Received 10 July 2001; published 13 September 2001

We report on a search for the radiative decay ϒ(1S)→γη′ in 61.3 pb-1 of data taken with the CLEO II detector at the Cornell Electron Storage Ring. Three decay chains were investigated, all involving η′→π+π-η, followed by η→γγ, η→π0π0π0, or η→π+π-π0. We find no candidate events in any of the three cases and set a combined upper limit of 1.6×10-5 at 90% C.L., significantly smaller than the previous limit. We compare our result to other radiative ϒ decays, to radiative J/ψ decays, and to theoretical predictions.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v87/e141801
DOI: 10.1103/PhysRevLett.87.141801
PACS: 13.25.Gv, 14.40.Gx

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