Measurements of the Rare Decay KLe+ee+e

A. Alavi-Harati et al. (KTeV Collaboration)
Phys. Rev. Lett. 86, 5425 – Published 11 June 2001
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Abstract

We observe 441 KLe+ee+e candidate events with a background of 4.2 events and measure B(KLe+ee+e)=[3.72±0.18(stat)±0.23(syst)]×108 in the KTeV/E799II experiment at Fermilab. Using the distribution of the angle between the planes of the e+e pairs, we measure the CP parameters βCP=0.23±0.09(stat)±0.02(syst) and γCP=0.09±0.09(stat)±0.02(syst). We also present the first detailed study of the e+e invariant mass spectrum in this decay mode.

  • Received 5 February 2001

DOI:https://doi.org/10.1103/PhysRevLett.86.5425

©2001 American Physical Society

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Vol. 86, Iss. 24 — 11 June 2001

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