Measurements of the Decay KLe+eμ+μ

A. Alavi-Harati et al. (KTeV Collaboration)
Phys. Rev. Lett. 90, 141801 – Published 9 April 2003

Abstract

The KTeV experiment at Fermilab has isolated a total of 132 events from the rare decay KLe+eμ+μ, with an estimated background of 0.8 events. The branching ratio of this mode is determined to be [2.69±0.24(stat)±0.12(syst)]×109, with a radiative cutoff of Meeμμ2/MK2>0.95. The first measurement using this mode of the parameter α from the D’Ambrosio-Isidori-Portolès (DIP) model of the KLγ*γ* vertex yields a result of 1.59±0.37, consistent with values obtained from other decay modes. Because of the limited statistics, no sensitivity is found to the DIP parameter β. We use this decay mode to set limits on CP and lepton violation.

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  • Received 2 December 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.141801

©2003 American Physical Society

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Vol. 90, Iss. 14 — 11 April 2003

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