Phys. Rev. D
68,
072003
(2003)
[25 pages]
Study of the q2 dependence of B⃗πlν and of B⃗ρ(ω)lν and extraction of |Vub|
S. B. Athar et al. (CLEO Collaboration)
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S. B. Athar, P. Avery, L. Breva-Newell, V. Potlia, H. Stoeck, and J. Yelton
University of Florida, Gainesville, Florida 32611, USA
K. Benslama, B. I. Eisenstein, G. D. Gollin, I. Karliner, N. Lowrey, C. Plager, C. Sedlack, M. Selen, J. J. Thaler, and J. Williams
University of Illinois, Urbana-Champaign, Illinois 61801, USA
K. W. Edwards
Carleton University, Ottawa, Ontario, Canada K1S 5B6
the Institute of Particle Physics, Canada
D. Besson and X. Zhao
University of Kansas, Lawrence, Kansas 66045, USA
S. Anderson, V. V. Frolov, D. T. Gong, Y. Kubota, S. Z. Li, R. Poling, A. Smith, C. J. Stepaniak, and J. Urheim
University of Minnesota, Minneapolis, Minnesota 55455, USA
Z. Metreveli, K. K. Seth, A. Tomaradze, and P. Zweber
Northwestern University, Evanston, Illinois 60208, USA
S. Ahmed, M. S. Alam, J. Ernst, L. Jian, M. Saleem, and F. Wappler
State University of New York at Albany, Albany, New York 12222, USA
K. Arms, E. Eckhart, K. K. Gan, C. Gwon, K. Honscheid, D. Hufnagel, H. Kagan, R. Kass, T. K. Pedlar, E. von Toerne, and M. M. Zoeller
Ohio State University, Columbus, Ohio 43210, USA
H. Severini and P. Skubic
University of Oklahoma, Norman, Oklahoma 73019, USA
S. A. Dytman, J. A. Mueller, S. Nam, and V. Savinov
University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
J. W. Hinson, J. Lee, D. H. Miller, V. Pavlunin, B. Sanghi, E. I. Shibata, and I. P. J. Shipsey
Purdue University, West Lafayette, Indiana 47907, USA
D. Cronin-Hennessy, A. L. Lyon, C. S. Park, W. Park, J. B. Thayer, and E. H. Thorndike
University of Rochester, Rochester, New York 14627, USA
T. E. Coan, Y. S. Gao, F. Liu, Y. Maravin, and R. Stroynowski
Southern Methodist University, Dallas, Texas 75275, USA
M. Artuso, C. Boulahouache, S. Blusk, E. Dambasuren, O. Dorjkhaidav, R. Mountain, H. Muramatsu, R. Nandakumar, T. Skwarnicki, S. Stone, and J. C. Wang
Syracuse University, Syracuse, New York 13244, USA
A. H. Mahmood
University of Texas–Pan American, Edinburg, Texas 78539, USA
S. E. Csorna and I. Danko
Vanderbilt University, Nashville, Tennessee 37235, USA
G. Bonvicini, D. Cinabro, M. Dubrovin, and S. McGee
Wayne State University, Detroit, Michigan 48202, USA
A. Bornheim, E. Lipeles, S. P. Pappas, A. Shapiro, W. M. Sun, and A. J. Weinstein
California Institute of Technology, Pasadena, California 91125, USA
R. A. Briere, G. P. Chen, T. Ferguson, G. Tatishvili, and H. Vogel
Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
N. E. Adam, J. P. Alexander, K. Berkelman, V. Boisvert, D. G. Cassel, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, R. S. Galik, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, L. Hsu, C. D. Jones, J. Kandaswamy, D. L. Kreinick, A. Magerkurth, H. Mahlke-Krüger, T. O. Meyer, N. B. Mistry, J. R. Patterson, D. Peterson, J. Pivarski, S. J. Richichi, D. Riley, A. J. Sadoff, H. Schwarthoff, M. R. Shepherd, J. G. Thayer, D. Urner, T. Wilksen, A. Warburton*, and M. Weinberger
Cornell University, Ithaca, New York 14853, USA
(CLEO Collaboration)
Received 10 April 2003; published 9 October 2003
We report on determinations of |Vub| resulting from studies of the branching fraction and q2 distributions in exclusive semileptonic B decays that proceed via the b⃗u transition. Our data set consists of the 9.7×106 BB̅ meson pairs collected at the Υ(4S) resonance with the CLEO II detector. We measure B(B0→π-l+ν)=(1.33±0.18±0.11±0.01±0.07)×10-4 and B(B0→ρ-l+ν)=(2.17±0.34-0.54+0.47±0.41±0.01)×10-4, where the errors are statistical, experimental systematic, systematic due to residual form-factor uncertainties in the signal, and systematic due to residual form-factor uncertainties in the cross-feed modes, respectively. We also find B(B+→ηl+ν)=(0.84±0.31±0.16±0.09)×10-4, consistent with what is expected from the B⃗πlν mode and quark model symmetries. We extract |Vub| using light-cone sum rules for 0<~q2<16GeV2 and lattice QCD for 16GeV2<~q2<qmax2. Combining both intervals yields |Vub|=(3.24±0.22±0.13-0.39+0.55±0.09)×10-3 for πlν, and |Vub|=(3.00±0.21-0.35-0.38+0.29+0.49±0.28)×10-3 for ρlν, where the errors are statistical, experimental systematic, theoretical, and ρlν form-factor shape, respectively. Our combined value from both decay modes is |Vub|=(3.17±0.17-0.17-0.39+0.16+0.53±0.03)×10-3.
© 2003 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.68.072003
DOI:
10.1103/PhysRevD.68.072003
PACS:
13.20.He, 12.15.Hh, 14.40.Nd
*Present address: McGill University, Montréal, Québec, Canada H3A 2T8.
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