Measurement of the B̄→D*lν̄ branching fractions and -Vcb-

B. Barish, M. Chadha, S. Chan, D. F. Cowen, G. Eigen, J. S. Miller, C. O'Grady, J. Urheim, A. J. Weinstein, D. Acosta, M. Athanas, G. Masek, H. P. Paar, J. Gronberg, R. Kutschke, S. Menary, R. J. Morrison, S. Nakanishi, H. N. Nelson, T. K. NelsonC. Qiao, J. D. Richman, A. Ryd, H. Tajima, D. Sperka, M. S. Witherell, M. Procario, R. Balest, K. Cho, M. Daoudi, W. T. Ford, D. R. Johnson, K. Lingel, M. Lohner, P. Rankin, J. G. Smith, 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, F. Würthwein, P. Avery, A. Freyberger, J. Rodriguez, S. Yang, J. Yelton, D. Cinabro, S. Henderson, T. Liu, M. Saulnier, R. Wilson, H. Yamamoto, T. Bergfeld, B. I. Eisenstein, G. Gollin, B. Ong, M. Palmer, M. Selen, J. J. Thaler, K. W. Edwards, M. Ogg, A. Bellerive, D. I. Britton, E. R.F. Hyatt, D. B. MacFarlane, P. M. Patel, B. Spaan, A. J. Sadoff, 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, H. Lam, Y. Kubota, M. Lattery, M. Momayezi, J. K. Nelson, S. Patton, D. Perticone, R. Poling, V. Savinov, S. Schrenk, R. Wang, M. S. Alam, I. J. Kim, B. Nemati, Z. Ling, J. J. O'Neill, H. Severini, C. R. Sun, F. Wappler, 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, M. M. Zoeller, F. Butler, X. Fu, G. Kalbfleisch, W. R. Ross, P. Skubic, M. Wood, J. Fast, R. L. Mcilwain, T. Miao, D. H. Miller, M. Modesitt, D. Payne, E. I. Shibata, I. P.J. Shipsey, P. N. Wang, M. Battle, J. Ernst, L. Gibbons, Y. Kwon, S. Roberts, E. H. Thorndike, C. H. Wang, J. Dominick, M. Lambrecht, S. Sanghera, V. Shelkov, T. Skwarnicki, R. Stroynowski, I. Volobouev, G. Wei, P. Zadorozhny, 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, G. Zhu, J. Bartelt, S. E. Csorna, Z. Egyed, V. Jain, D. Gibaut, K. Kinoshita

Research output: Contribution to journalArticle

138 Citations (Scopus)

Abstract

We study the exclusive semileptonic B meson decays B-→D*0l-ν̄ and B̄0→D*+l-ν̄ using data collected with the CLEO II detector at the Cornell Electron-positron Storage Ring (CESR). We present measurements of the branching fractions scrB(B̄0→D*+l-ν̄)= (0.5/f00)[4.49±0.32(stat.)±0.39 (syst.)]% and scrB(B-→D*0l-(ν̄)= (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(B̄→D*lν̄)=[29.9±1.9 (stat) ±2.7 (syst.) ±2.0 (lifetime)] ns-1 (independent of f+-/f00). From this partial width we calculate B̄→D*lν̄ 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 B̄→D*lν̄ 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.

Original languageEnglish
Pages (from-to)1014-1033
Number of pages20
JournalPhysical Review D
Volume51
Issue number3
DOIs
Publication statusPublished - 1995

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Measurement of the B̄→D*lν̄ branching fractions and -Vcb-'. Together they form a unique fingerprint.

  • Cite this

    Barish, B., Chadha, M., Chan, S., Cowen, D. F., Eigen, G., Miller, J. S., O'Grady, C., Urheim, J., Weinstein, A. J., Acosta, D., Athanas, M., Masek, G., Paar, H. P., Gronberg, J., Kutschke, R., Menary, S., Morrison, R. J., Nakanishi, S., Nelson, H. N., ... Kinoshita, K. (1995). Measurement of the B̄→D*lν̄ branching fractions and -Vcb-. Physical Review D, 51(3), 1014-1033. https://doi.org/10.1103/PhysRevD.51.1014