Phys. Rev. D
51,
1014–1033
(1995)
Measurement of the B¯→D*lν¯ branching fractions and ‖Vcb‖
B. Barish et al.
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B. Barish, M. Chadha, S. Chan, D. F. Cowen, G. Eigen, J. S. Miller, C. O’Grady, J. Urheim, and A. J. Weinstein
California Institute of Technology, Pasadena, California 91125
D. Acosta, M. Athanas, G. Masek, and H. P. Paar
University of California, San Diego, La Jolla, California 92093
J. Gronberg, R. Kutschke, S. Menary, R. J. Morrison, S. Nakanishi, H. N. Nelson, T. K. Nelson, C. Qiao, J. D. Richman, A. Ryd, H. Tajima, D. Sperka, and M. S. Witherell
University of California, Santa Barbara, California 93106
M. Procario
Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
R. Balest, K. Cho, M. Daoudi, W. T. Ford, D. R. Johnson, K. Lingel, M. Lohner, P. Rankin, and J. G. Smith
University of Colorado, Boulder, Colorado 80309-0390
J. P. Alexander, C. Bebek, K. Berkelman, K. Bloom, T. E. Browder, D. G. Cassel, H. A. Cho, D. M. Coffman, D. S. Crowcroft, P. S. Drell, R. Ehrlich, P. Gaidarev, R. S. Galik, M. Garcia-Sciveres, B. Geiser, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, C. D. Jones, S. L. Jones, J. Kandaswamy, N. Katayama, P. C. Kim, D. L Kreinick, G. S. Ludwig, J. Masui, J. Mevissen, N. B. Mistry, C. R. Ng, E. Nordberg, J. R. Patterson, D. Peterson, D. Riley, S. Salman, M. Sapper, and F. Würthwein
Cornell University, Ithaca, New York 14853
P. Avery, A. Freyberger, J. Rodriguez, S. Yang, and J. Yelton
University of Florida, Gainesville, Florida 32611
D. Cinabro, S. Henderson, T. Liu, M. Saulnier, R. Wilson, and H. Yamamoto
Harvard University, Cambridge, Massachusetts 02138
T. Bergfeld, B. I. Eisenstein, G. Gollin, B. Ong, M. Palmer, M. Selen, and J. J. Thaler
University of Illinois, Champaign-Urbana, Illinois, 61801
K. W. Edwards and M. Ogg
Carleton University, Ottawa, Ontario K1S 5B6 and the Institute of Particle Physics, Canada
A. Bellerive, D. I. Britton, E. R. F. Hyatt, D. B. MacFarlane, P. M. Patel, and B. Spaan
McGill University, Montréal, Québec H3A 2T8 and the Institute of Particle Physics, Canada
A. J. Sadoff
Ithaca College, Ithaca, New York 14850
R. Ammar, S. Ball, P. Baringer, A. Bean, D. Besson, D. Coppage, N. Copty, R. Davis, N. Hancock, M. Kelly, S. Kotov, I. Kravchenko, N. Kwak, and H. Lam
University of Kansas, Lawrence, Kansas 66045
Y. Kubota, M. Lattery, M. Momayezi, J. K. Nelson, S. Patton, D. Perticone, R. Poling, V. Savinov, S. Schrenk, and R. Wang
University of Minnesota, Minneapolis, Minnesota 55455
M. S. Alam, I. J. Kim, B. Nemati, Z. Ling, J. J. O’Neill, H. Severini, C. R. Sun, and F. Wappler
State University of New York at Albany, Albany, New York 12222
G. Crawford, C. M. Daubenmier, R. Fulton, D. Fujino, K. K. Gan, K. Honscheid, H. Kagan, R. Kass, J. Lee, R. Malchow, Y. Skovpen, M. Sung, C. White, and M. M. Zoeller
Ohio State University, Columbus, Ohio, 43210
F. Butler, X. Fu, G. Kalbfleisch, W. R. Ross, P. Skubic, and M. Wood
University of Oklahoma, Norman, Oklahoma 73019
J. Fast, R. L. McIlwain, T. Miao, D. H. Miller, M. Modesitt, D. Payne, E. I. Shibata, I. P. J. Shipsey, and P. N. Wang
Purdue University, West Lafayette, Indiana 47907
M. Battle, J. Ernst, L. Gibbons, Y. Kwon, S. Roberts, E. H. Thorndike, and C. H. Wang
University of Rochester, Rochester, New York 14627
J. Dominick, M. Lambrecht, S. Sanghera, V. Shelkov, T. Skwarnicki, R. Stroynowski, I. Volobouev, G. Wei, and P. Zadorozhny
Southern Methodist University, Dallas, Texas 75275
M. Artuso, M. Goldberg, D. He, N. Horwitz, R. Kennett, R. Mountain, G. C. Moneti, F. Muheim, Y. Mukhin, S. Playfer, Y. Rozen, S. Stone, M. Thulasidas, G. Vasseur, X. Xing, and G. Zhu
Syracuse University, Syracuse, New York 13244
J. Bartelt, S. E. Csorna, Z. Egyed, and V. Jain
Vanderbilt University, Nashville, Tennessee 37235
D. Gibaut and K. Kinoshita
Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
Received 23 June 1994; published in the issue dated 1 February 1995
We study the exclusive semileptonic B meson decays B-→D*0l-ν¯ and B¯0→D*+l-ν¯ using data collected with the CLEO II detector at the Cornell Electron-positron Storage Ring (CESR). We present measurements of the branching fractions scrB(B¯0→D*+l-ν¯)= (0.5/f00)[4.49±0.32(stat.)±0.39 (syst.)]% and scrB(B-→D*0l-(ν¯)= (0.5/f+-)[5.13±0.54 (stat) ±0.64 (syst)]%, where f00 and f+- are the neutral and charged B meson production fractions at the Υ(4S) resonance, respectively. Assuming isospin invariance and taking the ratio of charged to neutral B meson lifetimes measured at higher energy machines, we determine the ratio f+-/f00=1.04±0.13 (stat) ±0.12 (syst) ±0.10 (lifetime); further assuming f+-+f00=1 we also determine the partial width Γ(B¯→D*lν¯)=[29.9±1.9 (stat) ±2.7 (syst.) ±2.0 (lifetime)] ns-1 (independent of f+-/f00). From this partial width we calculate B¯→D*lν¯ branching fractions that do not depend on f+-/f00 or the individual B lifetimes, but only on the charged to neutral B lifetime ratio. The product of the CKM matrix element ‖Vcb‖ times the normalization of the decay form factor at the point of no recoil of the D* meson, scrF(y=1), is determined from a linear fit to the combined differential decay rate of the exclusive B¯→D*lν¯ decays: ‖Vcb‖scrF(1)=0.0351±0.0019 (stat) ±0.0018 (syst) ±0.0008 (lifetime). The value for ‖Vcb‖ is extracted using theoretical calculations of the form factor normalization.
© 1995 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.51.1014
DOI:
10.1103/PhysRevD.51.1014
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