Phys. Rev. Lett.
76,
1570–1574
(1996)
Measurement of the B Semileptonic Branching Fraction with Lepton Tags
B. Barish et al. (CLEO Collaboration)
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B. Barish1, M. Chadha1, S. Chan1, G. Eigen1, J. S. Miller1, C. O'Grady1, J. Urheim1, A. J. Weinstein1, F. Würthwein1, D. M. Asner2, M. Athanas2, D. W. Bliss2, W. S. Brower2, G. Masek2, H. P. Paar2, J. Gronberg3, C. M. Korte3, R. Kutschke3, S. Menary3, R. J. Morrison3, S. Nakanishi3, H. N. Nelson3, T. K. Nelson3, C. Qiao3, J. D. Richman3, D. Roberts3, A. Ryd3, H. Tajima3, M. S. Witherell3, R. Balest4, K. Cho4, W. T. Ford4, M. Lohner4, H. Park4, P. Rankin4, J. G. Smith4, J. P. Alexander5, C. Bebek5, B. E. Berger5, K. Berkelman5, K. Bloom5, T. E. Browder5, D. G. Cassel5, H. A. Cho5, D. M. Coffman5, D. S. Crowcroft5, M. Dickson5, P. S. Drell5, D. J. Dumas5, R. Ehrlich5, R. Elia5, P. Gaidarev5, B. Gittelman5, S. W. Gray5, D. L. Hartill5, B. K. Heltsley5, S. Henderson5, C. D. Jones5, S. L. Jones5, J. Kandaswamy5, N. Katayama5, P. C. Kim5, D. L. Kreinick5, T. Lee5, Y. Liu5, G. S. Ludwig5, J. Masui5, J. Mevissen5, N. B. Mistry5, C. R. Ng5, E. Nordberg5, J. R. Patterson5, D. Peterson5, D. Riley5, A. Soffer5, P. Avery6, A. Freyberger6, K. Lingel6, C. Prescott6, J. Rodriguez6, S. Yang6, J. Yelton6, G. Brandenburg7, D. Cinabro7, T. Liu7, M. Saulnier7, R. Wilson7, H. Yamamoto7, T. Bergfeld8, B. I. Eisenstein8, J. Ernst8, G. E. Gladding8, G. D. Gollin8, M. Palmer8, M. Selen8, J. J. Thaler8, K. W. Edwards9,9b, K. W. McLean9,9b, M. Ogg9,9b, A. Bellerive10,10b, D. I. Britton10,10b, E. R. F. Hyatt10,10b, R. Janicek10,10b, D. B. MacFarlane10,10b, P. M. Patel10,10b, B. Spaan10,10b, A. J. Sadoff11, R. Ammar12, P. Baringer12, A. Bean12, D. Besson12, D. Coppage12, N. Copty12, R. Davis12, N. Hancock12, S. Kotov12, I. Kravchenko12, N. Kwak12, Y. Kubota13, M. Lattery13, J. K. Nelson13, S. Patton13, R. Poling13, T. Riehle13, V. Savinov13, R. Wang13, M. S. Alam14, I. J. Kim14, Z. Ling14, A. H. Mahmood14, J. J. O'Neill14, H. Severini14, C. R. Sun14, S. Timm14, F. Wappler14, J. E. Duboscq15, R. Fulton15, D. Fujino15, K. K. Gan15, K. Honscheid15, H. Kagan15, R. Kass15, J. Lee15, M. Sung15, C. White15, A. Wolf15, M. M. Zoeller15, X. Fu16, B. Nemati16, W. R. Ross16, P. Skubic16, M. Wood16, M. Bishai17, J. Fast17, E. Gerndt17, J. W. Hinson17, T. Miao17, D. H. Miller17, M. Modesitt17, E. I. Shibata17, I. P. J. Shipsey17, P. N. Wang17, L. Gibbons18, S. D. Johnson18, Y. Kwon18, S. Roberts18, E. H. Thorndike18, T. E. Coan19, J. Dominick19, V. Fadeyev19, I. Korolkov19, M. Lambrecht19, S. Sanghera19, V. Shelkov19, T. Skwarnicki19, R. Stroynowski19, I. Volobouev19, G. Wei19, M. Artuso20, M. Gao20, M. Goldberg20, D. He20, N. Horwitz20, S. Kopp20, G. C. Moneti20, R. Mountain20, F. Muheim20, Y. Mukhin20, S. Playfer20, S. Stone20, X. Xing20, J. Bartelt21, S. E. Csorna21, V. Jain21, S. Marka21, D. Gibaut22, K. Kinoshita22, P. Pomianowski22, and S. Schrenk22 (CLEO Collaboration)
1California Institute of Technology, Pasadena, California 91125
2University of California, San Diego, La Jolla, California 92093
3University of California, Santa Barbara, California 93106
4University of Colorado, Boulder, Colorado 80309-0390
5Cornell University, Ithaca, New York 14853
6University of Florida, Gainesville, Florida 32611
7Harvard University, Cambridge, Massachusetts 02138
8University of Illinois, Champaign-Urbana, Illinois 61801
9Carleton University, Ottawa, Ontario, Canada K1S 5B6
9band the Institute of Particle Physics, Canada
10McGill University, Montréal, Québec, Canada H3A 2T8
10band the Institute of Particle Physics, Montréal, Québec, Canada
11Ithaca College, Ithaca, New York 14850
12University of Kansas, Lawrence, Kansas 66045
13University of Minnesota, Minneapolis, Minnesota 55455
14State University of New York at Albany, Albany, New York 12222
15Ohio State University, Columbus, Ohio 43210
16University of Oklahoma, Norman, Oklahoma 73019
17Purdue University, West Lafayette, Indiana 47907
18University of Rochester, Rochester, New York 14627
19Southern Methodist University, Dallas, Texas 75275
20Syracuse University, Syracuse, New York 13244
21Vanderbilt University, Nashville, Tennessee 37235
22Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
Received 16 October 1995; published in the issue dated 4 March 1996
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 Vcb and to set an upper limit on the fraction of ϒ(4S) decays to final states other than BB̅ .
© 1996 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.1570
DOI:
10.1103/PhysRevLett.76.1570
PACS:
13.20.He, 13.30.Ce, 14.40.Nd
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