Improved limit on the rate of the decay K+ --> pi(+) (+)e(-)

We report results of a search for the lepton-family number violating decay K+-->pi(+) (+)e(-) from data collected by experiment E865 in 1996 at the Alternating Gradient Synchroton of Brookhaven National Laboratory. We place an upper limit on the branching ratio at 3.9x10(-11) ( 90% C.L.). Togethe...

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Bibliographic Details
Published in:Physical review letters 2000-09, Vol.85 (12), p.2450
Main Authors: Appel, R, Atoyan, GS, Bassalleck, B, Bergman, DR, Brown, DN, Cheung, N, Dhawan, S, Do, H, Egger, J, Eilerts, S, Felder, C, Fischer, H, Gach, M, Herold, W, Issakov, VV, Kaspar, H, Kraus, DE, Lazarus, DM, Leipuner, L, Lichard, P, Lowe, J, Lozano, J, Ma, H, Majid, W, Menzel, W, Pislak, S
Format: Article
Language:English
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Summary:We report results of a search for the lepton-family number violating decay K+-->pi(+) (+)e(-) from data collected by experiment E865 in 1996 at the Alternating Gradient Synchroton of Brookhaven National Laboratory. We place an upper limit on the branching ratio at 3.9x10(-11) ( 90% C.L.). Together with results based on data collected in 1995 and an earlier experiment, E777, this result establishes a combined 90% confidence level upper limit on the branching ratio at 2.8x10(-11). We also report a new upper limit on the branching ratio for pi(0)--> (+)e(-) of 3.8x10(-10) ( 90% C. L.).
ISSN:1079-7114