Measurement of Structure Dependent K^+ -> mu^+ nu gamma

Details Measurement of Structure Dependent K^+ -> mu^+ nu gamma Measurement of Structure Dependent K^+ -> mu^+ nu gamma

2000-03-16

arxiv.org/abs/hep-ex/0003019v1

Phys.Rev.Lett.85:2256-2259,2000

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 4 Figures. To be submitted to PRL

Scientific paper

10.1103/PhysRevLett.85.2256

We report the first measurement of a structure dependent component in the decay K^+ -> mu^+ nu 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 \pm 0.007 \pm 0.011. This corresponds to a branching ratio of BR(SD^+) = (1.33 \pm 0.12 \pm 0.18) \times 10^{-5}. We also set the limit -0.04 < F_V-F_A < 0.24 at 90% c.l.

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