Phys. Rev. Lett.
86,
3239–3243
(2001)
Measurement of the Branching Ratio and Asymmetry of the Decay Ξ°→Σ°γ
A. Alavi-Harati et al. (KTeV Collaboration)
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A. Alavi-Harati12, T. Alexopoulos12,*, M. Arenton11, K. Arisaka2, S. Averitte10, A. R. Barker5, L. Bellantoni7, A. Bellavance9, J. Belz10,†, R. Ben-David7, D. R. Bergman10, E. Blucher4, G. J. Bock7, C. Bown4, S. Bright4, E. Cheu1, S. Childress7, R. Coleman7, M. D. Corcoran9, G. Corti11, B. Cox11, M. B. Crisler7, A. R. Erwin12, R. Ford7, A. Glazov4, A. Golossanov11, G. Graham4, J. Graham4, K. Hagan11, E. Halkiadakis10, J. Hamm1, K. Hanagaki8,‡, S. Hidaka8, Y. B. Hsiung7, V. Jejer11, D. A. Jensen7, R. Kessler4, H. G. E. Kobrak3, J. LaDue5, A. Lath10, A. Ledovskoy11, P. L. McBride7, P. Mikelsons5, E. Monnier4,§, T. Nakaya7,**, K. S. Nelson11, H. Nguyen7, V. O'Dell7, M. Pang7, R. Pordes7, V. Prasad4, B. Quinn4, E. J. Ramberg7,††, R. E. Ray7, A. Roodman4,‡‡, M. Sadamoto8, S. Schnetzer10, K. Senyo8,a, P. Shanahan7, P. S. Shawhan4,b, J. Shields11, W. Slater2, N. Solomey4, S. V. Somalwar10, R. L. Stone10, I. Suzuki8,c, E. C. Swallow4,6, S. A. Taegar1, R. J. Tesarek10,d, G. B. Thomson10, P. A. Toale5, A. Tripathi2, R. Tschirhart7, S. E. Turner2, Y. W. Wah4, J. Wang1, H. B. White7, J. Whitmore7, B. Winstein4, R. Winston4, T. Yamanaka8, and E. D. Zimmerman4,e (KTeV Collaboration)
1University of Arizona, Tucson, Arizona 85721
2University of California at Los Angeles, Los Angeles, California 90095
3University of California at San Diego, La Jolla, California 92093
4The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637
5University of Colorado, Boulder, Colorado 80309
6Elmhurst College, Elmhurst, Illinois 60126
7Fermi National Accelerator Laboratory, Batavia, Illinois 60510
8Osaka University, Toyonaka, Osaka 560-0043 Japan
9Rice University, Houston, Texas 77005
10Rutgers University, Piscataway, New Jersey 08854
11The Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia 22901
12University of Wisconsin, Madison, Wisconsin 53706
Received 11 December 2000; published in the issue dated 9 April 2001
We have studied the rare weak radiative hyperon decay Ξ°→Σ°γ in the KTeV experiment at Fermilab. We have identified 4045 signal events over a background of 804 events. The dominant Ξ°→Λπ° decay, which was used for normalization, is the only important background source. An analysis of the acceptance of both modes yields a branching ratio of B(Ξ°→Σ°γ)/B(Ξ°→Λπ°) = (3.34±0.05±0.09)×10-3. By analyzing the final state decay distributions, we have also determined that the Σ° emission asymmetry parameter for this decay is αΞΣ = -0.63±0.09.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.3239
DOI:
10.1103/PhysRevLett.86.3239
PACS:
13.30.Eg, 13.40.Hq, 14.20.Jn
*Present address: National Technical University, 175 73 Athens, Greece. †Present address: Montana State University, Bozeman, Montana 59717. ‡Present address: Princeton University, Princeton, New Jersey 08544. §On leave from C.P.P. Marseille/C.N.R.S., France. **Present address: Kyoto University, 606-8502 Japan. ††To whom all correspondence should be addressed. ‡‡Present address: Stanford Linear Accelerator Center, Stanford, California 94309. aPresent address: Nagoya University, Nagoya 464-8602 Japan. bPresent address: California Institute of Technology, Pasadena, California 91125. cPresent address: Fermi National Accelerator Laboratory, Batavia, Illinois 60510. d ePresent address: Columbia University, New York, New York 10027.
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