Search for the Decay $Υ(1S)\to γη^{'}$

Details Search for the Decay $Υ(1S)\to γη^{'}$ Search for the Decay $Υ(1S)\to γη^{'}$

2001-07-10

arxiv.org/abs/hep-ex/0107021v1

Phys.Rev.Lett.87:141801,2001

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, submitted to PRL

Scientific paper

10.1103/PhysRevLett.87.141801

We report on a search for the radiative decay U(1S) -> gamma + eta' 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 eta' -> pi+ pi- + eta, followed by eta -> gamma + gamma, eta -> pi0 + pi0 + pi0, or eta -> pi+ + pi- + pi0. We find no candidate events in any of the three cases and set a combined upper limit of 1.6 x 10^-5 at 90% C.L., significantly smaller than the previous limit. We compare our result to other radiative U(1S) decays, to radiative J/psi decays, and to theoretical predictions.

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