Evidence for the decay KLμ+μγγ

A. Alavi-Harati et al.
Phys. Rev. D 62, 112001 – Published 16 October 2000
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Abstract

We have observed the decay KLμ+μγγ at the KTeV experiment at Fermilab. This decay presents a formidable background to the search for new physics in KLπ0μ+μ. The 1997 data yielded a sample of 4 signal events, with an expected background of 0.155±0.081 events. The branching ratio is B(KLμ+μγγ)=[10.45.9+7.5(stat)±0.7(syst)]×109 with mγγ>~1MeV/c2, consistent with a QED calculation which predicts (9.1±0.8)×109.

  • Received 23 December 1999

DOI:https://doi.org/10.1103/PhysRevD.62.112001

©2000 American Physical Society

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Vol. 62, Iss. 11 — 1 December 2000

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