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Measurement of the B semileptonic branching fraction with lepton tags
Ammar, Raymond G. Baringer, Philip S. Bean, Alice Besson, David Zeke Coppage, Don Copty, N. Davis, Robin E. P. Hancock, N. Kotov, S. Kravchenko, I.
Ammar, Raymond G.
Baringer, Philip S.
Bean, Alice
Besson, David Zeke
Coppage, Don
Copty, N.
Davis, Robin E. P.
Hancock, N.
Kotov, S.
Kravchenko, I.
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Abstract
We have used the CLEO II detector and 2.06 fb(-1) of Y(4S) data to measure the B-meson semileptonic branching fraction. The B --> Xe nu momentum spectrum was obtained over nearly the full momentum range by using charge and kinematic correlations in events with a high-momentum lepton tag and an additional electron. We find B(B --> Xe nu) = (10.49 +/- 0.17 +/- 0.43)%, with overall systematic uncertainties less than those of untagged single-lepton measurements. We use this result to calculate the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element V-cb and to set an upper limit on the fraction of Y(4S) decays to final states other than B (B) over bar.
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1996-03
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AMERICAN PHYSICAL SOC
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Barish, B, Chadha, M, et al. Measurement of the B semileptonic branching fraction with lepton tags. PHYSICAL REVIEW LETTERS. March 1996. 76(10) : 1570-1574