Improved measurement of /V(cb)/ using B-->D*l nu decays.
We determine the weak coupling /V(cb)/ between the b and c quarks using a sample of 3 x 10(6) BB; events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed B-->D*l nu; 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 d Gamma/dw. By extrapolating d Gamma/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. Combined with theoretical results for F(1) we determine /V(cb)/=0.0469+/-0.0014(stat)+/-0.0020(syst)+/-0.0018(theor).
Briere
R A
RA
Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
Chen
G P
GP
Ferguson
T
T
Tatishvili
G
G
Vogel
H
H
Adam
N E
NE
Alexander
J P
JP
Bebek
C
C
Berger
B E
BE
Berkelman
K
K
Blanc
F
F
Boisvert
V
V
Cassel
D G
DG
Drell
P S
PS
Duboscq
J E
JE
Ecklund
K M
KM
Ehrlich
R
R
Gibbons
L
L
Gittelman
B
B
Gray
S W
SW
Hartill
D L
DL
Heltsley
B K
BK
Hsu
L
L
Jones
C D
CD
Kandaswamy
J
J
Kreinick
D L
DL
Magerkurth
A
A
Mahlke-Krüger
H
H
Meyer
T O
TO
Mistry
N B
NB
Nordberg
E
E
Palmer
M
M
Patterson
J R
JR
Peterson
D
D
Pivarski
J
J
Riley
D
D
Sadoff
A J
AJ
Schwarthoff
H
H
Shepherd
M R
MR
Thayer
J G
JG
Urner
D
D
Valant-Spaight
B
B
Viehhauser
G
G
Warburton
A
A
Weinberger
M
M
Athar
S B
SB
Avery
P
P
Stoeck
H
H
Yelton
J
J
Brandenburg
G
G
Ershov
A
A
Kim
D Y-J
DY
Wilson
R
R
Benslama
K
K
Eisenstein
B I
BI
Ernst
J
J
Gollin
G D
GD
Hans
R M
RM
Karliner
I
I
Lowrey
N
N
Marsh
M A
MA
Plager
C
C
Sedlack
C
C
Selen
M
M
Thaler
J J
JJ
Williams
J
J
Edwards
K W
KW
Ammar
R
R
Besson
D
D
Zhao
X
X
Anderson
S
S
Frolov
V V
VV
Kubota
Y
Y
Lee
S J
SJ
Li
S Z
SZ
Poling
R
R
Smith
A
A
Stepaniak
C J
CJ
Urheim
J
J
Ahmed
S
S
Alam
M S
MS
Jian
L
L
Saleem
M
M
Wappler
F
F
Eckhart
E
E
Gan
K K
KK
Gwon
C
C
Hart
T
T
Honscheid
K
K
Hufnagel
D
D
Kagan
H
H
Kass
R
R
Pedlar
T K
TK
Thayer
J B
JB
von Toerne
E
E
Wilksen
T
T
Zoeller
M M
MM
Richichi
S J
SJ
Severini
H
H
Skubic
P
P
Dytman
S A
SA
Nam
S
S
Savinov
V
V
Chen
S
S
Hinson
J W
JW
Lee
J
J
Miller
D H
DH
Pavlunin
V
V
Shibata
E I
EI
Shipsey
I P J
IP
Cronin-Hennessy
D
D
Lyon
A L
AL
Park
C S
CS
Park
W
W
Thorndike
E H
EH
Coan
T E
TE
Gao
Y S
YS
Liu
F
F
Maravin
Y
Y
Narsky
I
I
Stroynowski
R
R
Ye
J
J
Artuso
M
M
Boulahouache
C
C
Bukin
K
K
Dambasuren
E
E
Mountain
R
R
Skwarnicki
T
T
Stone
S
S
Wang
J C
JC
Mahmood
A H
AH
Csorna
S E
SE
Danko
I
I
Xu
Z
Z
Bonvicini
G
G
Cinabro
D
D
Dubrovin
M
M
McGee
S
S
Bornheim
A
A
Lipeles
E
E
Pappas
S P
SP
Shapiro
A
A
Sun
W M
WM
Weinstein
A J
AJ
Masek
G
G
Paar
H P
HP
Mahapatra
R
R