Measurement of lepton momentum moments in the decay B̄ → Xℓv̄ and determination of the heavy quark expansion parameters and |Vcb|

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. AlexanderK. Berkelman, V. Boisvert, D. G. Cassel, P. S. Drell, 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, S. B. Athar, P. Avery, L. Breva-Newell, V. Potlia, H. Stoeck, J. Yelton, K. Benslama, B. I. Eisenstein, G. D. Gollin, Karliner, N. Lowrey, C. Plager, C. Sedlack, M. Selen, J. J. Thaler, J. Williams, K. W. Edwards, R. Ammar, D. Besson, X. Zhao, S. Anderson, V. 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, S. Chen, J. W. Hinson, J. Lee, D. H. Miller, V. Pavlunin, 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, K. Bukin, E. Dambasuren, R. Mountain, H. Muramatsu, R. Nandakumar, T. Skwarnicki, S. Stone, J. C. Wang

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24 Scopus citations

Abstract

We measure the primary lepton momentum spectrum in B̄→Xℓ v̄ decays, for p≥ 1.5 GeV/c in the B rest frame. From this, we calculate various moments of the spectrum. In particular, we find R0 ≡ ∫1.7 GeV(dΓ/dE sl)dE/∫1.5 GeV(dΓ/ dEsl)dE=0.6187±0.0014stat±0. 0016sys and R11.5 GeVE (dΓ/dEsl)dE/∫ 1.5 GeV(dΓ/dEsl)dE=(1. 7810±0.0007stat±0.0009sys) GeV. We use these moments to determine non-perturbative parameters governing the semileptonic width. In particular, we extract the heavy quark expansion parameters Λ̄=(0.39±0.03stat±0.06 sys±0.12th) GeV and λ1 = (-0.25±0.02stat±0.05sys ±0.14 th) GeV2. The theoretical constraints used are evaluated through order 1/MB3 in the non-perturbative expansion and β0αs2 in the perturbative expansion. We use these parameters to extract |Vcb| from the world average of the semileptonic width and find |Vcb| = (40.8±0.5 Γsl±0.4 (λ1,Λ̄)exp±0.9th)× 10 -3. In addition, we extract the short range b-quark mass m b1S=(4.82±0.070exp±0.11 th) GeV/c2. Finally, we discuss the implications of our measurements for the theoretical understanding of inclusive semileptonic processes.

Original languageEnglish (US)
Article number072001
JournalPhysical Review D
Volume67
Issue number7
DOIs
StatePublished - 2003

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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