First Observation of the Decay KLπ0e+eγ

A. Alavi-Harati et al. (The KTeV Collaboration)
Phys. Rev. Lett. 87, 021801 – Published 25 June 2001
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Abstract

We report on the first observation of the decay KLπ0e+eγ by the KTeV E799 experiment at Fermilab. Based upon a sample of 48 events with an estimated background of 3.6±1.1 events, we measure the KLπ0e+eγ branching ratio to be (2.34±0.35±0.13)×108. Our data agree with recent O(p6) calculations in chiral perturbation theory that include contributions from vector meson exchange through the parameter aV. A fit was made to the KLπ0e+eγ data for aV with the result 0.67±0.21±0.12, which is consistent with previous results from KTeV.

  • Received 28 November 2000

DOI:https://doi.org/10.1103/PhysRevLett.87.021801

©2001 American Physical Society

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Vol. 87, Iss. 2 — 9 July 2001

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