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

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 Poblaguev, AA Postoev, VE Proskurjakov, AL Rehak, P Robmann, P Sher, A Thompson, JA Truol, P Weyer, H Zeller, ME
Citation
R. Appel et al., Improved limit on the rate of the decay K+ -> pi(+)mu(+)e(-), PHYS REV L, 85(12), 2000, pp. 2450-2453
Citations number
14
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
85
Issue
12
Year of publication
2000
Pages
2450 - 2453
Database
ISI
SICI code
0031-9007(20000918)85:12<2450:ILOTRO>2.0.ZU;2-O
Abstract
We report results of a search for the lepton-family number violating decay K+ --> pi(+) mu(+) 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 x 10(-11) (90% C.L.). Togethe r with results based on data collected in 1995 and an earlier experiment, E 777, this result establishes a combined 90% confidence level upper limit on the branching ratio at 2.8 x 10(-11). We also report a new upper limit on the branching ratio for pi(0) --> mu(+) e(-) of 3.8 x 10(-10) (90% C.L.).