Phys. Rev. Lett.
82,
3751–3754
(1999)
Observation of the Decay Ξ0→Σ+e-ν̅ e
A. Affolder et al. (KTeV Collaboration)
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A. Affolder4, A. Alavi-Harati12, I. F. Albuquerque10, 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. Golossanov11, G. Graham4, J. Graham4, K. Hagan11, E. Halkiadakis10, K. Hanagaki8, S. Hidaka8, Y. B. Hsiung7, V. Jejer11, J. Jennings2, D. A. Jensen7, R. Kessler4, H. G. E. Kobrak3, J. LaDue5, A. Lath10, A. Ledovskoy11, P. L. McBride7, A. P. McManus11, P. Mikelsons5, E. Monnier4,*, T. Nakaya7, U. Nauenberg5, K. S. Nelson11, H. Nguyen7, V. O'Dell7, M. Pang7, R. Pordes7, V. Prasad4, C. Qiao4, B. Quinn4, E. J. Ramberg7, R. E. Ray7, A. Roodman4, M. Sadamoto8, S. Schnetzer10, K. Senyo8, P. Shanahan7, P. S. Shawhan4, W. Slater2, N. Solomey4, S. V. Somalwar10, R. L. Stone10, I. Suzuki8, E. C. Swallow4,6, R. A. Swanson3, S. A. Taegar1, R. J. Tesarek10, G. B. Thomson10, P. A. Toale5, A. Tripathi2, R. Tschirhart7, Y. W. Wah4, J. Wang1, H. B. White7, J. Whitmore7, B. Winstein4, R. Winston4, J. Y. Wu5, T. Yamanaka8, and E. D. Zimmerman4 (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 Japan
9Rice University, Houston, Texas 77005
10Rutgers University, Piscataway, New Jersey 08855
11The Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia 22901
12University of Wisconsin, Madison, Wisconsin 53706
Received 23 December 1998; published in the issue dated 10 May 1999
We present the first observation of Ξ0 beta decay, using the KTeV beam line and detector at Fermilab. We have identified 176 beta decay events after subtracting a 7 event background. Normalization to 41 024 simultaneously collected Ξ0→Λ0π0 decays yields a branching ratio of Γ(Ξ0→Σ+e-ν̅ e)/Γtotal = (2.71±0.22statistical±0.31systematic)×10-4. The flavor symmetric quark model calculation agrees with this result.
© 1999 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.3751
DOI:
10.1103/PhysRevLett.82.3751
*On leave from C.P.P. Marseille/C.N.R.S., France. To whom correspondence should be addressed. Electronic address: monnier@hep.uchicago.edu
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