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

High Energy Physics - Experiment 2012-08-27 v1
Authors: E787 Collaboration
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Abstract

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.

Keywords

K^+ -> mu^+ nu gamma structure dependent form factors branching ratio lepton flavor

Cite

@article{arxiv.hep-ex/0003019,
  title  = {Measurement of Structure Dependent K^+ -> mu^+ nu gamma},
  author = {E787 Collaboration},
  journal= {arXiv preprint arXiv:hep-ex/0003019},
  year   = {2012}
}

Comments

13 pages, 4 Figures. To be submitted to PRL

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