Ma H, Appel R, Atoyan GS, Bassalleck B, Bergman DR, Cheung N, Dhawan S, Do H, Egger J, Eilerts S, Fischer H, Herold W, Issakov VV, Kaspar H, Kraus DE, Lazarus DM, Lichard P, Lowe J, Lozano J, Majid W, Menzel W, Pislak S, Poblaguev AA, Rehak P, Sher A, Thompson JA. New measurement of the rare decay K+ --> pi(+)&mgr;(+)&mgr;(-).
PHYSICAL REVIEW LETTERS 2000;
84:2580-2583. [PMID:
11017274 DOI:
10.1103/physrevlett.84.2580]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/1999] [Indexed: 05/23/2023]
Abstract
More than 400 K+-->pi(+)&mgr;(+)&mgr;(-) events were observed in a rare K+ decay experiment at the Brookhaven Alternating Gradient Synchrotron. Normalized to the K+-->pi(+)pi(+)pi(-) decay, the branching ratio is determined to be [9.22+/-0.60(stat)+/-0. 49(syst)]x10(-8). This branching ratio and the &mgr;&mgr; mass spectrum is in very good agreement with the measurement of the K+-->pi(+)e(+)e(-) decay, but deviates significantly from the previous measurement.
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