First Observation of KLπ±eνe+e

E. Abouzaid et al. (KTeV Collaboration)
Phys. Rev. Lett. 99, 081803 – Published 24 August 2007

Abstract

This Letter is the first report of the KLπ±eνe+e decay. Based on 19208±144 events, we determine the branching fraction, B(KLπ±eνe+e;Me+e>5MeV/c2,Ee+e*>30MeV)=(1.285±0.041)×105, and Γ(Ke3ee;Me+e>5MeV/c2)/Γ(Ke3)=[4.57±0.04(stat)±0.14(syst)]×105. This ratio agrees with a theoretical prediction based on chiral perturbation theory (ChPT) calculated to O(p4). The measured kinematical distributions agree with those predicted by just ChPT O(p4), but show significant disagreement with ones predicted by leading-order ChPT.

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  • Received 22 May 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.081803

©2007 American Physical Society

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Vol. 99, Iss. 8 — 24 August 2007

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