Search for the Decay $K_{L} \to π^{0} e^{+} e^{-}$

Publisher Website

15 January 2001

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 86 (3) , 397-401
https://doi.org/10.1103/physrevlett.86.397

Abstract

We report on a search for the decay

K_{L} \to π^{0} e^{+} e^{-}

carried out by the KTeV/E799 experiment at Fermilab. This decay is expected to have a significant

CP

violating contribution and the measurement of its branching ratio could support the Cabibbo-Kobayashi-Maskawa mechanism for

CP

violation or could point to new physics. Two events were observed in the 1997 data with an expected background of

1.06 \pm 0.41

events, and we set an upper limit

B (K_{L} \to π^{0} e^{+} e^{-}) < 5.1 \times 10^{- 10}

at the

90 %

confidence level.

Keywords

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Version 1, 2000-09-12, ArXiv

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