Authors

N. E. Adam
J. P. Alexander
C. Bebek
B. E. Berger
K. Berkelman
F. Blanc
V. Boisvert
D. G. Cassel
P. S. Drell
J. E. Duboscq
K. M. Ecklund
R. Ehrlich
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
E. Nordberg
M. Palmer
J. R. Patterson
D. Peterson
J. Pivarski
D. Riley
A. J. Sadoff
H. Schwarthoff
M. R. Shepherd
J. G. Thayer
D. Urner
B. Valant-Spaight
G. Viehhauser
A. Warburton
M. Weinberger
S. B. Athar
P. Avery
H. Stoeck
J. Yelton
G. Brandenburg
A. Ershov
D. Y. J. Kim
R. Wilson
K. Benslama
B. I. Eisenstein
J. Ernst
G. D. Gollin
R. M. Hans
I. Karliner
N. Lowrey
M. A. Marsh
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
Y. Kubota
S. J. Lee
S. Z. Li
R. Poling
A. Smith
C. J. Stepaniak
J. Urheim
S. Ahmed
M. S. Alam
L. Jian
M. Saleem
F. Wappler
E. Eckhart
K. K. Gan
C. Gwon
T. Hart
K. Honscheid
D. Hufnagel
H. Kagan
R. Kass
T. K. Pedlar
J. B. Thayer
E. von Toerne
T. Wilksen
M. M. Zoeller
S. J. Richichi
H. Severini
P. Skubic
S. A. Dytman
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
E. H. Thorndike
T. E. Coan
Y. S. Gao
F. Liu
Y. Maravin
I. Narsky
R. Stroynowski
J. Ye
M. Artuso
C. Boulahouache
K. Bukin
E. Dambasuren
R. Mountain
T. Skwarnicki
S. Stone
J. C. Wang
A. H. Mahmood
S. E. Csorna
I. Danko
Z. Xu
G. Bonvicini
D. Cinabro
M. Dubrovin
S. McGee
A. Bornheim
E. Lipeles
S. P. Pappas
A. Shapiro
W. M. Sun
A. J. Weinstein
G. Masek
H. P. Paar
R. Mahapatra
R. A. Briere
G. P. Chen
T. Ferguson
G. Tatishvili
H. Vogel

Published in:

Physical Review D 67,3 (2003) 032001;

Abstract

In the standard model, the charged current of the weak interaction is governed by a unitary quark mixing matrix that also leads to CP violation. Measurement of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements is essential to searches for new physics, either through the structure of the CKM matrix, or a departure from unitarity. We determine the CKM matrix element \V-cb\ using a sample of 3x10(6) B (B) over bar events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed (B) over bar (0)-->D*(+)l (ν) over bar and B--->D(*0)l (ν) over bar decays as a function of w, the boost of the D* in the B rest frame, and from this we obtain the differential decay rate dGamma/dw. By extrapolating dGamma/dw to w=1, the kinematic end point at which the D* is at rest relative to the B, we extract the product \V-cb\F(1), where F(1) is the form factor at w=1. We find \V-cb\F(1)=0.0431+/-0.0013(stat)+/-0.0018(syst). We combine \V-cb\F(1) with theoretical results for F(1) to determine \V-cb\=0.0469+/-0.0014(stat)+/-0.0020(syst)+/-0.0018(theor). We also integrate the differential decay rate over w to obtain B((B) over bar (0)-->D*(+)(ν) over bar)=(6.09+/-0.19+/-0.40)% and B(B--->D*(0)l (ν) over bar)=(6.50+/-0.20+/-0.43)%.

Keywords

quark effective theory;; effective field-theory;; b-meson decays;; kobayashi-maskawa matrix;; form-factors;; branching fraction;; semileptonic decays;; dispersive bounds;; heavy quarks;; cp-violation

Date of this Version

January 2003

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