Authors

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
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-Kruger
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
I. 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

Published in:

Physical Review D 67,7 (2003) 072001;

Abstract

We measure the primary lepton momentum spectrum in (B) over bar -->Xl (ν) over bar decays, for plgreater than or equal to1.5 GeV/c in the B rest frame. From this, we calculate various moments of the spectrum. In particular, we find R(0)equivalent tointegral(1.7 GeV)(dGamma/dE(sl))dEl/integral(1.5 GeV)(dGamma/dE(sl))dEl=0.6187+/-0.0014(stat)+/-0.0016(sys) and R(1)equivalent tointegral(1.5 GeV)El(dGamma/dE(sl))dEl/integral(1.5 GeV)(dGamma/dE(sl))dEl=(1.7810+/-0.0007(stat)+/-0.0009(sys)) GeV. We use these moments to determine non-perturbative parameters governing the semileptonic width. In particular, we extract the heavy quark expansion parameters (&ULambda;) over bar=(0.39+/-0.03(stat)+/-0.06(sys)+/-0.12(th)) GeV and lambda(1)=(-0.25+/-0.02(stat)+/-0.05(sys)+/-0.14(th)) GeV2. The theoretical constraints used are evaluated through order 1/M-B(3) in the non-perturbative expansion and beta(0)alpha(s)(2) in the perturbative expansion. We use these parameters to extract \V-cb\ from the world average of the semileptonic width and find \V-cb\=(40.8+/-0.5(Gammasl)+/-0.4((lambda1),((&ULambda;) over bar )exp)+/-0.9(th))x10(-3). In addition, we extract the short range b-quark mass m(b)(1S)=(4.82+/-0.07(exp)+/-0.11(th)) GeV/c(2). Finally, we discuss the implications of our measurements for the theoretical understanding of inclusive semileptonic processes.

Keywords

radiative-corrections;; semileptonic-b;; qcd;; spectrum;; mass;; physics

Date of this Version

January 2003

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