Observation of the decay Ξ0→Σ+μ-ν̄μ

E. Abouzaid, T. Alexopoulos, M. Arenton, R. F. Barbosa, A. R. Barker, L. Bellantoni, A. Bellavance, E. Blucher, G. J. Bock, E. Cheu, R. Coleman, M. D. Corcoran, B. Cox, A. R. Erwin, C. O. Escobar, A. Glazov, A. Golossanov, R. A. Gomes, P. Gouffon, K. HanagakiY. B. Hsiung, H. Huang, D. A. Jensen, R. Kessler, K. Kotera, J. Ladue, A. Ledovskoy, P. L. McBride, E. Monnier, K. S. Nelson, H. Nguyen, R. Niclasen, H. Ping, V. Prasad, X. R. Qi, E. J. Ramberg, R. E. Ray, M. Ronquest, E. Santos, J. Shields, W. Slater, D. Smith, N. Solomey, E. C. Swallow, P. A. Toale, R. Tschirhart, C. Velissaris, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. Wilking, B. Winstein, R. Winston, E. T. Worcester, M. Worcester, T. Yamanaka, E. D. Zimmerman, R. F. Zukanovich

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The Ξ0 muon semileptonic decay has been observed for the first time with nine identified events using the KTeV beam line and detector at Fermilab. The decay is normalized to the Ξ0 beta decay mode and yields a value for the ratio of decay rates Γ(Ξ0→Σ+μ-ν̄μ)/ Γ(Ξ0→Σ+e-ν̄e) of [1.8-0.5+0.7(stat)±0.2(syst) ]×10-2. This is in agreement with the SU(3) flavor symmetric quark model.

Original languageEnglish (US)
Article number081801
JournalPhysical review letters
Issue number8
StatePublished - Aug 19 2005
Externally publishedYes

Bibliographical note

Funding Information:
The authors are grateful to S.I.Eidelman for useful discussions and valuable comments. This work is supported in part by The Russian Fund for Basic Researches, grants No. 97-02-18561 and 96-15-96327.


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