Search for the Rare Decay KLπ0e+e

A. Alavi-Harati et al.
Phys. Rev. Lett. 93, 021805 – Published 9 July 2004

Abstract

The KTeV/E799 experiment at Fermilab has searched for the rare kaon decay KLπ0e+e. This mode is expected to have a significant CP violating component. The measurement of its branching ratio could support the standard model or could indicate the existence of new physics. This Letter reports new results from the 1999–2000 data set. One event is observed with an expected background at 0.99±0.35 events. We set a limit on the branching ratio of 3.5×1010 at the 90% confidence level. Combin­ing with the previous result based on the data set taken in 1997 yields the final KTeV result: BR(KLπ0e+e)<2.8×1010 at 90% C.L.

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  • Received 17 September 2003

DOI:https://doi.org/10.1103/PhysRevLett.93.021805

©2004 American Physical Society

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Vol. 93, Iss. 2 — 9 July 2004

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