Improved branching ratio measurement for the decay K0L → μ+μ-

被引：49

作者：

Ambrose, D ^{[1
]}

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

Welsh, RE

Wojcicki, SG

机构：

[1] Univ Texas, Austin, TX 78712 USA

[2] Stanford Univ, Stanford, CA 94305 USA

[3] Univ Calif Irvine, Irvine, CA 92697 USA

[4] Coll William & Mary, Williamsburg, VA 23187 USA

[5] Univ Richmond, Richmond, VA 23173 USA

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.84.1389

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report results from Experiment 871, performed at the BNL AGS, of a measurement of the branching ratio K-L(0) --> mu(+)mu(-) with respect to the CP-violating mode K-L(0) --> pi(+)pi(-). This experiment detected over 6200 candidate mu(+)mu(-) events, a factor of 6 more than that seen in all previous measurements combined. The resulting branching ratio Gamma(K-L(0) --> mu(+)mu(-))/Gamma(K-L(0) --> pi(+)pi(-)) = (3.474 +/- 0.057) X 10(-6) leads to a branching fraction B(K-L(0) --> mu(+)mu(-)) = (7.18 +/- 0.17) X 10(-9), which is consistent with the current world average, and reduces the uncertainty in this decay mode by a factor of 3.

引用

页码：1389 / 1392

页数：4

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