ITA
ENG

Measurement of the decay K-L -> pi(0)gamma gamma

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 Golossanov, A Graham, G Graham, J Hagan, K Halkiadakis, E Hanagaki, K 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 Nauenberg, U 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 Wu, JY Yamanaka, T Zimmerman, ED

Citation

A. Alavi-harati et al., Measurement of the decay K-L -> pi(0)gamma gamma, PHYS REV L, 83(5), 1999, pp. 917-921

Citations number

Categorie Soggetti

Physics

Journal title

PHYSICAL REVIEW LETTERS

ISSN journal

00319007 → ACNP

Volume

Issue

Year of publication

1999

Pages

917 - 921

Database

ISI

SICI code

0031-9007(19990802)83:5<917:MOTDK->2.0.ZU;2-Y

Abstract

We report on a new measurement of the decay K-L --> pi(0)gamma gamma by the KTeV experiment at Fermilab. We determine the K-L --> pi(0)gamma gamma bra nching ratio to be (1.68 +/- 0.07 +/- 0.08) x 10(-6). Our data show the fir st evidence for a low-mass gamma gamma signal as predicted by recent O(p(6) ) chiral perturbation calculations which include vector meson exchange cont ributions. From our data, we extract a value for the effective vector coupl ing a(V) = -0.72 +/- 0.05 +/- 0.06.