First observation of the decay B --> J/psistraight phiK
We present the first observation of the decay B-->J/psistraight phiK. Using 9.6x10(6) B&Bmacr; meson pairs collected with the CLEO detector, we have observed ten fully reconstructed B-->J/psistraight phiK candidates, whereas the estimated background is 0.5+/-0.2 event. We obtain a branching fraction of B(B-->J/psistraight phiK) = (8. 8(+3.5)(-3.0)[stat]+/-1.3[syst])x10(-5). This is the first observed B meson decay requiring the creation of an additional s&smacr; quark pair.
Smith
JG
Ohio State University, Columbus, Ohio 43210, USA.
Alexander
JP
Baker
R
Bebek
C
Berger
BE
Berkelman
K
Blanc
F
Boisvert
V
Cassel
DG
Dickson
M
Drell
PS
Ecklund
KM
Ehrlich
R
Foland
AD
Gaidarev
P
Gibbons
L
Gittelman
B
Gray
SW
Hartill
DL
Heltsley
BK
Hopman
PI
Jones
CD
Kreinick
DL
Lohner
M
Magerkurth
A
Meyer
TO