Study of the q2 dependence of B→πℓν and of B→ρ(ω)ℓν and extraction of |Vub|

S. B. Athar, P. Avery, L. Breva-Newell, V. Potlia, H. Stoeck, J. Yelton, K. Benslama, B. I. Eisenstein, G. D. Gollin, I. Karliner, N. Lowrey, C. Plager, C. Sedlack, M. Selen, J. J. Thaler, J. Williams, K. W. Edwards, D. Besson, X. Zhao, S. AndersonV. V. Frolov, D. T. Gong, Y. Kubota, S. Z. Li, R. Poling, A. Smith, C. J. Stepaniak, J. Urheim, Z. Metreveli, K. K. Seth, A. Tomaradze, P. Zweber, S. Ahmed, M. S. Alam, J. Ernst, L. Jian, M. Saleem, F. Wappler, K. Arms, E. Eckhart, K. K. Gan, C. Gwon, K. Honscheid, D. Hufnagel, H. Kagan, R. Kass, T. K. Pedlar, E. von Toerne, M. M. Zoeller, H. Severini, P. Skubic, S. A. Dytman, J. A. Mueller, S. Nam, V. Savinov, J. W. Hinson, J. Lee, D. H. Miller, V. Pavlunin, B. Sanghi, E. I. Shibata, I. P.J. Shipsey, D. Cronin-Hennessy, A. L. Lyon, C. S. Park, W. Park, J. B. Thayer, E. H. Thorndike, T. E. Coan, Y. S. Gao, F. Liu, Y. Maravin, R. Stroynowski, M. Artuso, C. Boulahouache, S. Blusk, E. Dambasuren, O. Dorjkhaidav, R. Mountain, H. Muramatsu, R. Nandakumar, T. Skwarnicki, S. Stone, J. C. Wang, A. H. Mahmood, S. E. Csorna, I. Danko, G. Bonvicini, D. Cinabro, M. Dubrovin, S. McGee, A. Bornheim, E. Lipeles, S. P. Pappas, A. Shapiro, W. M. Sun, A. J. Weinstein, R. A. Briere, G. P. Chen, T. Ferguson, G. Tatishvili, H. Vogel, 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, M. Weinberger

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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 b→u transition. Our data set consists of the 9.7×106 BB̄ meson pairs collected at the Y(4S) resonance with the CLEO II detector. We measure B(B0→π -+ν)=(1.33±0.18±0.11± 0.01±0.07)×10-4 and B(B0→ρ -+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 B→πℓν mode and quark model symmetries. We extract |V ub| using light-cone sum rules for 0≤q2<16GeV 2 and lattice QCD for 16 GeV2≤q2<q max2. Combining both intervals yields |V ub|=(3.24 ±0.22±0.13-0.39 +0.55-0.09)×10-3 for πℓν, and |V ub|=(3.00±0.210.35+0.29 -0.38+0.494±0.28)×10-3 for pfv, 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+ 0.16-0.39+0.53±0.03)×10 -3.

Original languageEnglish (US)
Article number072003
Pages (from-to)720031-7200325
Number of pages6480295
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7
StatePublished - Oct 2003

Bibliographical note

Funding Information:
This reeaswasrsupcporthed by the RussniFoandaution of Fundamental Research (Grant 96-03-33820), INAS T Project 96-922 and International Soros Science Educational Program (Grant a97-1151).


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