Phys. Rev. Lett.
77,
5000–5004
(1996)
First Measurement of the B → πℓν and B → ρ(ω)ℓν Branching Fractions
J. P. Alexander et al. (CLEO Collaboration)
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J. P. Alexander1, C. Bebek1, B. E. Berger1, K. Berkelman1, K. Bloom1, D. G. Cassel1, H. A. Cho1, D. M. Coffman1, D. S. Crowcroft1, M. Dickson1, P. S. Drell1, D. J. Dumas1, R. Ehrlich1, R. Elia1, P. Gaidarev1, B. Gittelman1, S. W. Gray1, D. L. Hartill1, B. K. Heltsley1, C. D. Jones1, S. L. Jones1, J. Kandaswamy1, N. Katayama1, P. C. Kim1, D. L. Kreinick1, T. Lee1, Y. Liu1, G. S. Ludwig1, J. Masui1, J. Mevissen1, N. B. Mistry1, C. R. Ng1, E. Nordberg1, J. R. Patterson1, D. Peterson1, D. Riley1, A. Soffer1, C. Ward1, P. Avery1, C. Prescott2, S. Yang2, J. Yelton2, G. Brandenburg3, R. A. Briere3, T. Liu3, M. Saulnier3, R. Wilson3, H. Yamamoto3, T. E. Browder4, F. Li4, J. L. Rodriguez4, T. Bergfeld5, B. I. Eisenstein5, J. Ernst5, G. E. Gladding5, G. D. Gollin5, I. Karliner5, M. Palmer5, M. Selen5, J. J. Thaler5, K. W. Edwards6, M. Ogg6, A. Bellerive7, D. I. Britton7, R. Janicek7, D. B. MacFarlane7, K. W. McLean7, P. M. Patel7, A. J. Sadoff8, R. Ammar9, P. Baringer9, A. Bean9, D. Besson9, D. Coppage9, N. Copty9, R. Davis9, N. Hancock9, S. Kotov9, I. Kravchenko9, N. Kwak9, S. Anderson10, Y. Kubota10, M. Lattery10, J. J. O'Neill10, S. Patton10, R. Poling10, T. Riehle10, V. Savinov10, A. Smith10, M. S. Alam11, S. B. Athar11, I. J. Kim11, Z. Ling11, A. H. Mahmood11, H. Severini11, S. Timm11, F. Wappler11, J. E. Duboscq12, D. Fujino12, R. Fulton12, K. K. Gan12, K. Honscheid12, H. Kagan12, R. Kass12, J. Lee12, M. Sung12, A. Undrus12, R. Wanke12, C. White12, A. Wolf12, M. M. Zoeller12, B. Nemati13, S. J. Richichi13, W. R. Ross13, P. Skubic13, M. Wood13, M. Bishai14, J. Fast14, E. Gerndt14, J. W. Hinson14, D. H. Miller14, E. I. Shibata14, I. P. J. Shipsey14, M. Yurko14, M. Battle15, L. Gibbons15, S. D. Johnson15, Y. Kwon15, S. Roberts15, K. Sparks15, E. H. Thorndike15, C. P. Jessop16, K. Lingel16, H. Marsiske16, M. L. Perl16, S. F. Schaffner16, R. Wang16, T. E. Coan17, V. Fadeyev17, I. Korolkov17, Y. Maravin17, I. Narsky17, V. Shelkov17, J. Staeck17, R. Stroynowski17, I. Volobouev17, J. Ye17, M. Artuso18, A. Efimov18, M. Gao18, M. Goldberg18, R. Greene18, D. He18, S. Kopp18, G. C. Moneti18, R. Mountain18, Y. Mukhin18, T. Skwarnicki18, S. Stone18, X. Xing18, J. Bartelt19, S. E. Csorna19, V. Jain19, S. Marka19, A. Freyberger20, D. Gibaut20, K. Kinoshita20, I. C. Lai20, P. Pomianowski20, S. Schrenk20, G. Bonvicini21, D. Cinabro21, B. Barish22, M. Chadha22, S. Chan22, G. Eigen22, J. S. Miller22, C. O'Grady22, M. Schmidtler22, J. Urheim22, A. J. Weinstein22, F. Würthwein22, D. M. Asner23, M. Athanas23, D. W. Bliss23, W. S. Brower23, G. Masek23, H. P. Paar23, J. Gronberg24, C. M. Korte24, R. Kutschke24, D. J. Lange24, S. Menary24, R. J. Morrison24, S. Nakanishi24, H. N. Nelson24, T. K. Nelson24, C. Qiao24, J. D. Richman24, D. Roberts24, A. Ryd24, H. Tajima24, M. S. Witherell24, R. Balest25, B. H. Behrens25, K. Cho25, W. T. Ford25, M. Lohner25, H. Park25, P. Rankin25, J. Roy25, and J. G. Smith25 (CLEO Collaboration)
1Cornell University, Ithaca, New York 14853
2University of Florida, Gainesville, Florida 32611
3Harvard University, Cambridge, Massachusetts 02138
4University of Hawaii at Manoa, Honolulu, Hawaii 96822
5University of Illinois, Champaign-Urbana, Illinois 61801
6Carleton University and Institute of Particle Physics, Ottawa, Ontario Canada K1S 5B6
7McGill University and Institute of Particle Physics, Montréal, Québec, Canada H3A 2T8
8Ithaca College, Ithaca, New York 14850
9University of Kansas, Lawrence, Kansas 66045
10University of Minnesota, Minneapolis, Minnesota 55455
11State University of New York at Albany, Albany, New York 12222
12The Ohio State University, Columbus, Ohio 43210
13University of Oklahoma, Norman, Oklahoma 73019
14Purdue University, West Lafayette, Indiana 47907
15University of Rochester, Rochester, New York 14627
16Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
17Southern Methodist University, Dallas, Texas 75275
18Syracuse University, Syracuse, New York 13244
19Vanderbilt University, Nashville, Tennessee 37235
20Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
21Wayne State University, Detroit, Michigan 48202
22California Institute of Technology, Pasadena, California 91125
23University of California, San Diego, La Jolla, California 92093
24University of California, Santa Barbara, California 93106
25University of Colorado, Boulder, Colorado 80309-0390
Received 1 July 1996; published in the issue dated 16 December 1996
CLEO has studied B decays to πℓν, ρℓν, and ωℓν, where ℓ = eorμ, by incorporating the missing momentum into full B reconstruction. With the B0 and B+ modes combined according to isospin predictions for the relative partial widths, we obtain B(B0→π-ℓ+ν) = (1.8±0.4±0.3±0.2)×10-4 and B(B0→ρ-ℓ+ν) = (2.5±0.4-0.7+0.5±0.5)×10-4, where the errors are statistical, systematic, and the estimated model dependence. We also estimate |Vub| = (3.3±0.2-0.4+0.3±0.7)×10-3.
© 1996 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.5000
DOI:
10.1103/PhysRevLett.77.5000
PACS:
13.20.He, 12.15.Hh, 14.40.Nd
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