Ambrose D, Arroyo C, Bachman M, Connor D, Eckhause M, Graessle S, Hancock AD, Hartman K, Hebert M, Hoff CH, Hoffmann GW, Irwin GM, Kane JR, Kanematsu N, Kuang Y, Lang K, Lee R, Martin RD, McDonough J, Milder A, Molzon WR, Pommot-Maia M, Riley PJ, Ritchie JL, Rubin PD, Vassilakopoulos VI. Improved branching ratio measurement for the decay K(0)(L) --> &mgr;(+)&mgr;(-).
PHYSICAL REVIEW LETTERS 2000;
84:1389-1392. [PMID:
11017525 DOI:
10.1103/physrevlett.84.1389]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/1999] [Indexed: 05/23/2023]
Abstract
We report results from Experiment 871, performed at the BNL AGS, of a measurement of the branching ratio K(0)(L)-->&mgr;(+)&mgr;(-) with respect to the CP-violating mode K(0)(L)-->pi(+)pi(-). This experiment detected over 6200 candidate &mgr;(+)&mgr;(-) events, a factor of 6 more than that seen in all previous measurements combined. The resulting branching ratio gamma(K(0)(L)-->&mgr;(+)&mgr;(-))/gamma(K(0)(L)-->pi(+)pi(-)) = (3. 474+/-0.057)x10(-6) leads to a branching fraction B(K(0)(L)-->&mgr;(+)&mgr;(-)) = (7.18+/-0.17)x10(-9), which is consistent with the current world average, and reduces the uncertainty in this decay mode by a factor of 3.
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