First observation of B(s)(0) → J/ψη and B(s)(0) → J/ψη'.
We report first observations of B(s)(0) → J/ψη and B(s)(0) → J/ψη'. The results are obtained from 121.4  fb(-1) of data collected at the Υ(5S) resonance with the Belle detector at the KEKB e+ e- collider. We obtain the branching fractions B(B(s)(0) → J/ψη)=[5.10±0.50(stat)±0.25(syst)(-0.79)(+1.14)(N(B(s)(*) B(s)(*))]×10(-4), and B(B(s)(0) → J/ψη')=[3.71±0.61(stat)±0.18(syst)(-0.57)(+0.83)(N(B(s)(*) B(s)(*))]×10(-4). The ratio of the two branching fractions is measured to be (B(B(s) → J/ψη'))/(B(B(s) → J/ψη))=0.73±0.14(stat)±0.02(syst).
Seoul National University, Seoul.
J
J
Li
I
I
Adachi
H
H
Aihara
K
K
Arinstein
D M
DM
Asner
V
V
Aulchenko
T
T
Aushev
A M
AM
Bakich
V
V
Bhardwaj
B
B
Bhuyan
M
M
Bischofberger
A
A
Bondar
A
A
Bozek
M
M
Bračko
O
O
Brovchenko
T E
TE
Browder
M-C
MC
Chang
A
A
Chen
P
P
Chen
B G
BG
Cheon
R
R
Chistov
K
K
Cho
S-K
SK
Choi
Y
Y
Choi
J
J
Dalseno
Z
Z
Doležal
A
A
Drutskoy
S
S
Eidelman
S
S
Esen
J E
JE
Fast
V
V
Gaur
A
A
Garmash
Y M
YM
Goh
J
J
Haba
T
T
Hara
K
K
Hayasaka
H
H
Hayashii
Y
Y
Horii
Y
Y
Hoshi
W-S
WS
Hou
Y B
YB
Hsiung
H J
HJ
Hyun
T
T
Iijima
K
K
Inami
A
A
Ishikawa
R
R
Itoh
M
M
Iwabuchi
Y
Y
Iwasaki
T
T
Iwashita
T
T
Julius
J H
JH
Kang
P
P
Kapusta
N
N
Katayama
T
T
Kawasaki
H J
HJ
Kim
H O
HO
Kim
J B
JB
Kim
K T
KT
Kim
M J
MJ
Kim
Y J
YJ
Kim
K
K
Kinoshita
B R
BR
Ko
N
N
Kobayashi
P
P
Kodyš
S
S
Korpar
P
P
Križan
P
P
Krokovny
T
T
Kuhr
R
R
Kumar
A
A
Kuzmin
Y-J
YJ
Kwon
J S
JS
Lange
M J
MJ
Lee
S-H
SH
Lee
Y
Y
Li
J
J
Libby
C
C
Liu
Y
Y
Liu
Z Q
ZQ
Liu
D
D
Liventsev
R
R
Louvot
D
D
Matvienko
S
S
McOnie
Y
Y
Miyazaki
R
R
Mizuk
G B
GB
Mohanty
A
A
Moll
T
T
Mori
N
N
Muramatsu
I
I
Nakamura
E
E
Nakano
M
M
Nakao
H
H
Nakazawa
Z
Z
Natkaniec
S
S
Nishida
K
K
Nishimura
O
O
Nitoh
S
S
Ogawa
T
T
Ohshima
S
S
Okuno
S L
SL
Olsen
W
W
Ostrowicz
G
G
Pakhlova
C W
CW
Park
H K
HK
Park
K S
KS
Park
T K
TK
Pedlar
T
T
Peng
R
R
Pestotnik
M
M
Petrič
L E
LE
Piilonen
M
M
Prim
M
M
Röhrken
S
S
Ryu
H
H
Sahoo
K
K
Sakai
Y
Y
Sakai
T
T
Sanuki
Y
Y
Sato
O
O
Schneider
C
C
Schwanda
A J
AJ
Schwartz
K
K
Senyo
O
O
Seon
M E
ME
Sevior
M
M
Shapkin
V
V
Shebalin
C P
CP
Shen
T-A
TA
Shibata
J-G
JG
Shiu
F
F
Simon
P
P
Smerkol
Y-S
YS
Sohn
A
A
Sokolov
S
S
Stanič
M
M
Starič
M
M
Sumihama
T
T
Sumiyoshi
S
S
Tanaka
G
G
Tatishvili
Y
Y
Teramoto
K
K
Trabelsi
M
M
Uchida
S
S
Uehara
Y
Y
Unno
S
S
Uno
P
P
Urquijo
Y
Y
Usov
G
G
Varner
K E
KE
Varvell
V
V
Vorobyev
A
A
Vossen
C H
CH
Wang
P
P
Wang
M
M
Watanabe
Y
Y
Watanabe
J
J
Wicht
K M
KM
Williams
E
E
Won
Y
Y
Yamashita
C Z
CZ
Yuan
Z P
ZP
Zhang
V
V
Zhilich
A
A
Zupanc
D004601:Elementary Particles; D011789:Quantum Theory