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Evidence for the decay K-L ->mu(+)mu(-)gamma gamma - art. no. 112001

Authors

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 Ledovskoy, A McBride, PL McManus, AP Mikelsons, P Monnier, E Nakaya, T Nelson, KS Nguyen, H O'Dell, V Pang, M Pordes, R Prasad, V Qiao, C Quinn, B Ramberg, EJ Ray, RE Roodman, A Sadamoto, M Schnetzer, S Senyo, K Shanahan, P Shawhan, PS Slater, W Solomey, N Somalwar, SV Stone, RL Suzuki, I Swallow, EC Swanson, RA Taegar, SA Tesarek, RJ Thomson, GB Toale, PA Tripathi, A Tschirhart, R Wah, YW Wang, J White, HB Whitmore, J Winstein, B Winston, R Yamanaka, T Zimmerman, ED

Citation

A. Alavi-harati et al., Evidence for the decay K-L ->mu(+)mu(-)gamma gamma - art. no. 112001, PHYS REV D, 6211(11), 2000, pp. 2001

Citations number

Categorie Soggetti

Physics

Journal title

PHYSICAL REVIEW D

ISSN journal

05562821 → ACNP

Volume

6211

Issue

Year of publication

2000

Database

ISI

SICI code

0556-2821(200012)6211:11<2001:EFTDK->2.0.ZU;2-1

Abstract

We have observed the decay K-L-->mu (+)mu (-)gamma gamma at the KTeV experi ment 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 sampl e 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 equa l to1 MeV/c(2), consistent with a QED calculation which predicts (9.1+/-0.8 ) x 10(-9).