Phys. Rev. Lett. 85, 2256–2259 (2000)Measurement of Structure-Dependent K+ → μ+νμγ DecayReceived 17 March 2000; published in the issue dated 11 September 2000 We report the first measurement of a structure-dependent component in the decay K+→μ+νμγ. 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 |FV+FA| = 0.165±0.007±0.011. This corresponds to a branching ratio of B(SD+) = (1.33±0.12±0.18)×10-5. We also set the limit -0.04<FV-FA<0.24 at 90% C.L. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.2256
DOI:
10.1103/PhysRevLett.85.2256
PACS:
13.20.Eb, 13.40.Ks
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