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Measurement of structure-dependent K+ --> &mgr;(+)nu(&mgr;)gamma decay |
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| Authors: | Adler Atiya Chiang Diwan Frank Haggerty Kettell Kycia Li Littenberg Sambamurti Stevens Strand Witzig Komatsubara Kuriki Muramatsu Sugimoto Inagaki Kabe Kobayashi Kuno Sato Shinkawa Yoshimura Kishi |
| Institution: | Brookhaven National Laboratory, Upton, New York 11973, USA. |
| Abstract: | We report the first measurement of a structure-dependent component in the decay K+-->&mgr;(+)nu(&mgr;)gamma. Using the kinematic region where the muon kinetic energy is greater than 137 MeV and the photon energy is greater than 90 MeV, we find that the absolute value of the sum of the vector and axial-vector form factors is |F(V)+F(A)| = 0.165+/-0.007+/-0.011. This corresponds to a branching ratio of B(SD+) = (1.33+/-0.12+/-0.18)x10(-5). We also set the limit -0. 04 |
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