Evidence for the decay KL→μ+μ-γγ -: art. no. 112001

被引：8

作者：

Alavi-Harati, A

Albuquerque, IF

Alexopoulos, T

Arenton, M

Arisaka, K

Averitte, S

Barker, AR

Bellantoni, L

Bellavance, A

Belz, J

Ben-David, R

Bergman, DR

Blucher, E

Bock, GJ

Bown, C

Bright, S

Cheu, E

Childress, S

Coleman, R

Corcoran, MD

Corti, G

Cox, B

Crisler, MB

Erwin, AR

Ford, R

Glazov, A

Golossanov, A

Graham, G

Graham, J

Hagan, K

Halkiadakis, E

Hanagaki, K

Hazumi, M

Hidaka, S

Hsiung, YB

Jejer, V

Jennings, J

Jensen, DA

Kessler, R

Kobrak, HGE

LaDue, J

Lath, A ^{[1
]}

Ledovskoy, A

McBride, PL

McManus, AP

Mikelsons, P

Monnier, E

Nakaya, T

Nelson, KS

Nguyen, H

机构：

[1] Rutgers State Univ, Piscataway, NJ 08855 USA

[2] Univ Arizona, Tucson, AZ 85721 USA

[3] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[4] Univ Calif San Diego, La Jolla, CA 92093 USA

[5] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[6] Univ Colorado, Boulder, CO 80309 USA

[7] Elmhurst Coll, Elmhurst, IL 60126 USA

[8] Fermi Natl Accelerator Lab, Batavia, IL 60510 USA

[9] Osaka Univ, Osaka 560, Japan

[10] Rice Univ, Houston, TX 77005 USA

[11] Univ Virginia, Dept Phys, Charlottesville, VA 22901 USA

[12] Univ Virginia, Inst Nucl & Particle Phys, Charlottesville, VA 22901 USA

[13] Univ Wisconsin, Madison, WI 53706 USA

来源：

PHYSICAL REVIEW D | 2000年 / 62卷 / 11期

关键词：

D O I：

10.1103/PhysRevD.62.112001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have observed the decay K-L-->mu (+)mu (-)gamma gamma at the KTeV experiment at Fermilab. This decay presents a formidable background to the search for new physics in K-L-->pi (0)mu (+)mu (-). The 1997 data yielded a sample of 4 signal events, with an expected background of 0.155+/-0.081 events. The branching ratio is beta (K-L -->mu (+)mu (-)gamma gamma)= [10.4(-5.9)(+7.5) (stat)+/- 0.7 (syst)] x 10(-9) with m(gamma gamma)greater than or equal to1 MeV/c(2), consistent with a QED calculation which predicts (9.1+/-0.8) x 10(-9).

引用

页数：5

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