ITA
ENG

Measurement of the branching ratio and asymmetry of the decay Xi degrees -> Sigma degrees gamma

Authors

Alavi-Harati, A 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 Hamm, J Hanagaki, K Hidaka, S Hsiung, YB Jejer, V Jensen, DA Kessler, R Kobrak, HGE LaDue, J Lath, A Ledovskoy, A McBride, PL Mikelsons, P Monnier, E Nakaya, T Nelson, KS Nguyen, H O'Dell, V Pang, M Pordes, R Prasad, V Quinn, B Ramberg, EJ Ray, RE Roodman, A Sadamoto, M Schnetzer, S Senyo, K Shanahan, P Shawhan, PS Shields, J Slater, W Solomey, N Somalwar, SV Stone, RL Suzuki, I Swallow, EC Taegar, SA Tesarek, RJ Thomson, GB Toale, PA Tripathi, A Tschirhart, R Turner, SE Wah, YW Wang, J White, HB Whitmore, J Winstein, B Winston, R Yamanaka, T Zimmerman, ED

Citation

A. Alavi-harati et al., Measurement of the branching ratio and asymmetry of the decay Xi degrees -> Sigma degrees gamma, PHYS REV L, 86(15), 2001, pp. 3239-3243

Citations number

Categorie Soggetti

Physics

Journal title

PHYSICAL REVIEW LETTERS

ISSN journal

00319007 → ACNP

Volume

Issue

Year of publication

2001

Pages

3239 - 3243

Database

ISI

SICI code

0031-9007(20010409)86:15<3239:MOTBRA>2.0.ZU;2-O

Abstract

We have studied the rare weak radiative hyperon decay Xi degrees --> Sigma degrees gamma in the KTeV experiment at Fermilab. We have identified 4045 s ignal events over a background of 804 events. The dominant Xi degrees --> L ambda pi degrees decay, which was used for normalization, is the only impor tant background source. An analysis of the acceptance of both modes yields a branching ratio of B(Xi degrees --> Sigma degrees gamma) / B(Xi degrees - -> Lambda pi degrees) = (3.34 +/- 0.05 +/- 0.09) X 10(-3). By analyzing the final state decay distributions, we have also determined that the Sigma de grees emission asymmetry parameter for this decay is alpha (Xi Sigma) = -0. 63 +/- 0.09.