Improved limit on the rate of the decay K+→π+μ+e

R. Appel, G. S. Atoyan, B. Bassalleck, D. R. Bergman, D. N. Brown, N. Cheung, S. Dhawan, H. Do, J. Egger, S. Eilerts, C. Felder, H. Fischer, M. Gach, W. Herold, V. V. Issakov, H. Kaspar, D. E. Kraus, D. M. Lazarus, L. Leipuner, P. LichardJ. Lowe, J. Lozano, H. Ma, W. Majid, W. Menzel, S. Pislak, A. A. Poblaguev, V. E. Postoev, A. L. Proskurjakov, P. Rehak, P. Robmann, A. Sher, J. A. Thompson, P. Truöl, H. Weyer, M. E. Zeller

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


We report results of a search for the lepton-family number violating decay K+→π+μ+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 3.9×10−11 (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 2.8×10−11. We also report a new upper limit on the branching ratio for π0→μ+e of3.8 × 10−10 (90% C.L.).

Original languageEnglish
Pages (from-to)2450-2453
Number of pages4
JournalPhysical Review Letters
Issue number12
StatePublished - Sep 18 2000


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