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Artamonov, A.V.; Bassalleck, B.; Bhuyan, B.; Blackmore, E.W.; Bryman, D.A.; Chen, S.; Chiang, I.-H.; Christidi, I.-A.; Cooper, P.S.; Diwan, M.V.; Frank, J.S.; Fujiwara, T.; Hu, J.; Jaffe, D.E.; Kabe, S.; Kettell, S.H.; Khabibullin, M.M.; Khotjantsev, A.N.; Kitching, P.; Kobayashi, M.; Komatsubara, T.K.; Konaka, A.; Kozhevnikov, A.P.; Kudenko, Yu.G.; Kushnirenko, A.; Landsberg, L.G.; Lewis, B.; Li, K.K.; Littenberg, L.S.; Macdonald, J.A.; Mildenberger, J.; Mineev, O.V.; Miyajima, M.; Mizouchi, K.; Mukhin, V.A.; Muramatsu, N.; Nakano, T.; Nomachi, M.; Nomura, T.; Numao, T.; Obraztsov, V.F.; Omata, K.; Patalakha, D.I.; Petrenko, S.V.; Poutissou, R.; Ramberg, E.J.; Redlinger, G.; Sato, T.; Sekiguchi, T.; Shinkawa, T.; Strand, R.C.; Sugimoto, S.; Tamagawa, Y.; Tschirhart, R.; Tsunemi, T.; Vavilov, D.V.; Viren, B.; Yershov, N.V.; Yoshimura, Y.; Yoshioka, T.
Physics letters. B, 09/2005, Letnik: 623, Številka: 3-4Journal Article
We have searched for the K+→π+γγ decay in the kinematic region with π+ 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+→π+γγ,P>213 MeV/c)<8.3×10−9 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+→π+γ branching ratio of 2.3×10−9 at the 90% confidence level.
