Search for the decay K+ to pi+ gamma gamma in the pi+ momentum region P>213 MeV/c

Details Search for the decay K+ to pi+ gamma gamma in the pi+ momentum region P>213 MeV/c Search for the decay K+ to pi+ gamma gamma in the pi+ momentum region P>213 MeV/c

2005-05-24

arxiv.org/abs/hep-ex/0505069v2

Phys.Lett.B623:192-199,2005

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 3 figures; no change in the results, accepted for publication in Physics Letters B

Scientific paper

10.1016/j.physletb.2005.07.057

We have searched for the K+ to pi+ gamma gamma decay in the kinematic region with pi+ momentum close to the end point. No events were observed, and the 90% confidence-level upper limit on the partial branching ratio was obtained, B(K+ to pi+ gamma gamma, P>213 MeV/c) < 8.3 x 10-9 under the assumption of chiral perturbation theory including next-to-leading order ``unitarity'' corrections. The same data were used to determine an upper limit on the K+ to pi+ gamma branching ratio of 2.3 x 10-9 at the 90% confidence level.

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