First observation of the rare decay mode KL0→e+e-

被引：40

作者：

Ambrose, D ^{[1
]}

Arroyo, C

Bachman, M

de Cecco, P

Connor, D

Eckhause, M

Ecklund, KM

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

Ware, CB

Welsh, RE

Wojcicki, SG

Wolin, E

Worm, S

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 | 1998年 / 81卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.81.4309

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In an experiment designed to search for and study very rare two-body decay modes of the K-L(0), we have observed four examples of the decay K-L(0) --> e(+)e(-), where the expected background is 0.17 +/- 0.10 events. This observation translates into a branching fraction of 8.7(-4.1)(+5.7) x 10(-12), consistent with recent theoretical predictions. This result represents by far the smallest branching fraction yet measured in particle physics. [S0031-9007(98)07665-0].

引用

页码：4309 / 4312

页数：4

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