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Measurement of charmless semileptonic decays of B mesons
Ammar, Raymond G. Ball, S. Baringer, Philip S. Coppage, Don Copty, N. Davis, Robin E. P. Hancock, N. Kelly, M. Kwak, Nowhan Lam, H.
Ammar, Raymond G.
Ball, S.
Baringer, Philip S.
Coppage, Don
Copty, N.
Davis, Robin E. P.
Hancock, N.
Kelly, M.
Kwak, Nowhan
Lam, H.
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Abstract
Using the CLEO II detector and a sample of 955 000 UPSILON(4S) decays we have confirmed charmless semileptonic decays of B mesons. In the momentum interval 2.3-2.6 GeV/c we observe an excess of 107 +/- 15 +/- 11 leptons, which we attribute to b --> ulnu. This result yields a model-dependent range of values for \V(ub)/V(cb)\ that is lower than has been obtained in previous studies. For the inclusive spectator model of Altarelli et al. we find \V(ub)/V(cb)\ = 0.076 +/- 0.008. Models that describe b --> ulnu with a limited set of exclusive final states give \V(ub)/V(cb)\ = 0.06 - 0.10.
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1993-12
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AMERICAN PHYSICAL SOC
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p4111_1.pdf
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BARTELT, J, CSORNA, SE, et al. Measurement of charmless semileptonic decays of B mesons. PHYSICAL REVIEW LETTERS. December 1993. 71(25) : 4111-4115