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arXiv · 1003.3609

Measurement of the K+ -> pi0 mu+ nu_mu gamma Branching Ratio

The E787 Collaboration
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Abstract

A measurement of the decay K+ -> pi0 mu+ nu_mu gamma has been performed with the E787 detector at Brookhaven National Laboratory. Forty events were observed in the signal region with the background expectation of (16.5 +- 2.7) events. The branching ratio was measured to be (1.58 +- 0.46(stat.) +- 0.08(syst.)) x 10^{-5}} in the kinematic region Eg >30 MeV and theta_{mu gamma} > 20degree, where Eg is the energy of the emitted photon and theta_{mu gamma} is the angle between the muon and the photon in the K+ rest frame. The results were consistent with theoretical predictions.

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The E787 Collaboration. 2010-03-18. Measurement of the K+ -> pi0 mu+ nu_mu gamma Branching Ratio. https://doi.org/10.1103/physrevd.81.092001

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