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Measurement of the B Semileptonic Branching Fraction with Lepton Tags

Barish, B. and Chadha, M. and Chan, S. and Eigen, G. and Miller, J. S. and O'Grady, C. and Urheim, J. and Würthwein, F. and Weinstein, Alan J. (1996) Measurement of the B Semileptonic Branching Fraction with Lepton Tags. Physical Review Letters, 76 (10). pp. 1570-1574. ISSN 0031-9007.

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We have used the CLEO II detector and 2.06fb^(-1) of ϒ(4S) data to measure the B-meson semileptonic branching fraction. The B→Xeν 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→Xeν) = (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 ϒ(4S) decays to final states other than BB̅ .

Item Type:Article
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Weinstein, Alan J.0000-0002-0928-6784
Additional Information:© 1996 The American Physical Society. Received 16 October 1995; published in the issue dated 4 March 1996. We are grateful to the CESR staff for providing excellent luminosity and running conditions. We thank A. Vainshtein and M. Shifman for stimulating discussions. This work was supported by the National Science Fundation, the U.S. Department of Energy, the Heisenberg Foundation, the Alexander von Humboldt Stiftung, the Natural Sciences and Engineering Research Council of Canada, and the A.P. Sloan Foundation.
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Heisenberg FoundationUNSPECIFIED
Alexander von Humboldt StiftungUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
A. P. Sloan FoundationUNSPECIFIED
Classification Code:PACS: 13.20.He, 13.30.Ce, 14.40.Nd
Record Number:CaltechAUTHORS:20120207-111915609
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Official Citation:Measurement of the B Semileptonic Branching Fraction with Lepton Tags B. Barish et al. ((CLEO Collaboration)) pp. 1570-1574
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29169
Deposited By: Ruth Sustaita
Deposited On:07 Feb 2012 19:38
Last Modified:27 Jan 2015 22:49

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