Observation of Bs production at the Y(5S) resonance.
Using the CLEO detector at the Cornell Electron Storage Ring, we have observed the Bs meson in e+e- annihilation at the Y(5S) resonance. We find 14 candidates consistent with Bs decays into final states with a J/psi or a Ds(*)- . The probability that we have observed a background fluctuation is less than 8 x 10(-10) . We have established that at the energy of the Y(5S) resonance Bs production proceeds predominantly through the creation of Bs*Bs* pairs. We find sigma(e+e- --> Bs*Bs*) = [0.11(-0.03))(+0.04)(stat) +/- 0.02(syst)]nb , and set the following limits: sigma(e+e- --> BsBs)/ sigma(e+ e- --> Bs*Bs*) <0.16 and [sigma(e+e- --> BsBs*) + sigma(e+e- --> Bs*Bs)]/sigma(e+e- -->Bs*Bs*) < 0.16 (90% C.L.). The mass of the Bs* meson is measured to be M(Bs*) = [5.414+/- 0.001(stat) +/- 0.003(syst)] GeV/c2 .
Wayne State University, Detroit, Michigan 48202, USA.
G
G
Bonvicini
D
D
Cinabro
M
M
Dubrovin
A
A
Lincoln
A
A
Bornheim
S P
SP
Pappas
A J
AJ
Weinstein
D M
DM
Asner
K W
KW
Edwards
R A
RA
Briere
G P
GP
Chen
J
J
Chen
T
T
Ferguson
G
G
Tatishvili
H
H
Vogel
M E
ME
Watkins
J L
JL
Rosner
N E
NE
Adam
J P
JP
Alexander
K
K
Berkelman
D G
DG
Cassel
V
V
Crede
J E
JE
Duboscq
K M
KM
Ecklund
R
R
Ehrlich
L
L
Fields
L
L
Gibbons
B
B
Gittelman
R
R
Gray
S W
SW
Gray
D L
DL
Hartill
B K
BK
Heltsley
D
D
Hertz
C D
CD
Jones
J
J
Kandaswamy
D L
DL
Kreinick
V E
VE
Kuznetsov
H
H
Mahlke-Krüger
T O
TO
Meyer
P U E
PU
Onyisi
J R
JR
Patterson
D
D
Peterson
E A
EA
Phillips
J
J
Pivarski
D
D
Riley
A
A
Ryd
A J
AJ
Sadoff
H
H
Schwarthoff
X
X
Shi
M R
MR
Shepherd
S
S
Stroiney
W M
WM
Sun
D
D
Urner
T
T
Wilksen
K M
KM
Weaver
M
M
Weinberger
S B
SB
Athar
P
P
Avery
L
L
Breva-Newell
R
R
Patel
V
V
Potlia
H
H
Stoeck
J
J
Yelton
P
P
Rubin
C
C
Cawlfield
B I
BI
Eisenstein
G D
GD
Gollin
I
I
Karliner
D
D
Kim
N
N
Lowrey
P
P
Naik
C
C
Sedlack
M
M
Selen
E J
EJ
White
J
J
Williams
J
J
Wiss
D
D
Besson
T K
TK
Pedlar
D
D
Cronin-Hennessy
K Y
KY
Gao
D T
DT
Gong
J
J
Hietala
Y
Y
Kubota
T
T
Klein
B W
BW
Lang
S Z
SZ
Li
R
R
Poling
A W
AW
Scott
A
A
Smith
S
S
Dobbs
Z
Z
Metreveli
K K
KK
Seth
A
A
Tomaradze
P
P
Zweber
J
J
Ernst
K
K
Arms
H
H
Severini
S A
SA
Dytman
W
W
Love
S
S
Mehrabyan
J A
JA
Mueller
V
V
Savinov
Z
Z
Li
A
A
Lopez
H
H
Mendez
J
J
Ramirez
G S
GS
Huang
D H
DH
Miller
V
V
Pavlunin
B
B
Sanghi
I P J
IP
Shipsey
G S
GS
Adams
M
M
Anderson
J P
JP
Cummings
I
I
Danko
J
J
Napolitano
Q
Q
He
H
H
Muramatsu
C S
CS
Park
E H
EH
Thorndike
T E
TE
Coan
Y S
YS
Gao
F
F
Liu
Y
Y
Maravin
M
M
Artuso
C
C
Boulahouache
S
S
Blusk
J
J
Butt
O
O
Dorjkhaidav
J
J
Li
N
N
Menaa
R
R
Mountain
R
R
Nandakumar
K
K
Randrianarivony
R
R
Redjimi
R
R
Sia
T
T
Skwarnicki
S
S
Stone
J C
JC
Wang
K
K
Zhang
S E
SE
Csorna