Observation of a resonancelike structure in the pi +- psi' mass distribution in exclusive B-->Kpi +- psi' decays.
A distinct peak is observed in the pi +/- psi' invariant mass distribution near 4.43 GeV in B-->K pi +/- psi' decays. A fit using a Breit-Wigner resonance shape yields a peak mass and width of M=4433+/-4(stat)+/-2(syst) MeV and Gamma=45-13+18(stat)-13+30(syst) MeV. The product branching fraction is determined to be B(B 0-->K -/+Z+/-(4430)) x B(Z+/-(4430)-->pi+/-psi')=(4.1+/-1.0(stat)+/-1.4(syst)) x 10(-5), where Z+/-(4430) is used to denote the observed structure. The statistical significance of the observed peak is 6.5 sigma. These results are obtained from a 605 fb(-1) data sample that contains 657 x 10(6) BB pairs collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e+ e- collider.
Gyeongsang National University, Chinju.
S-K
SK
Choi
S L
SL
Olsen
I
I
Adachi
H
H
Aihara
V
V
Aulchenko
T
T
Aushev
T
T
Aziz
A M
AM
Bakich
V
V
Balagura
I
I
Bedny
U
U
Bitenc
A
A
Bondar
A
A
Bozek
M
M
Bracko
J
J
Brodzicka
T E
TE
Browder
P
P
Chang
Y
Y
Chao
A
A
Chen
K-F
KF
Chen
W T
WT
Chen
B G
BG
Cheon
R
R
Chistov
Y
Y
Choi
J
J
Dalseno
M
M
Danilov
M
M
Dash
S
S
Eidelman
N
N
Gabyshev
B
B
Golob
J
J
Haba
T
T
Hara
K
K
Hayasaka
H
H
Hayashii
M
M
Hazumi
D
D
Heffernan
Y
Y
Hoshi
W-S
WS
Hou
H J
HJ
Hyun
T
T
Iijima
K
K
Inami
A
A
Ishikawa
H
H
Ishino
R
R
Itoh
M
M
Iwasaki
Y
Y
Iwasaki
D H
DH
Kah
J H
JH
Kang
N
N
Katayama
H
H
Kawai
T
T
Kawasaki
H
H
Kichimi
H O
HO
Kim
S K
SK
Kim
Y J
YJ
Kim
K
K
Kinoshita
P
P
Krizan
P
P
Krokovny
R
R
Kumar
C C
CC
Kuo
A
A
Kuzmin
Y-J
YJ
Kwon
J S
JS
Lange
J S
JS
Lee
M J
MJ
Lee
S E
SE
Lee
T
T
Lesiak
A
A
Limosani
S-W
SW
Lin
Y
Y
Liu
D
D
Liventsev
F
F
Mandl
A
A
Matyja
S
S
McOnie
T
T
Medvedeva
W
W
Mitaroff
K
K
Miyabayashi
H
H
Miyake
H
H
Miyata
Y
Y
Miyazaki
R
R
Mizuk
G R
GR
Moloney
E
E
Nakano
M
M
Nakao
S
S
Nishida
O
O
Nitoh
T
T
Nozaki
S
S
Ogawa
T
T
Ohshima
S
S
Okuno
H
H
Ozaki
P
P
Pakhlov
G
G
Pakhlova
C W
CW
Park
H
H
Park
L S
LS
Peak
R
R
Pestotnik
L E
LE
Piilonen
H
H
Sahoo
Y
Y
Sakai
O
O
Schneider
A J
AJ
Schwartz
K
K
Senyo
M
M
Shapkin
C P
CP
Shen
H
H
Shibuya
B
B
Shwartz
J B
JB
Singh
A
A
Somov
S
S
Stanic
M
M
Staric
T
T
Sumiyoshi
S Y
SY
Suzuki
F
F
Takasaki
K
K
Tamai
M
M
Tanaka
Y
Y
Teramoto
I
I
Tikhomirov
S
S
Uehara
T
T
Uglov
Y
Y
Unno
S
S
Uno
P
P
Urquijo
G
G
Varner
K
K
Vervink
S
S
Villa
C H
CH
Wang
M-Z
MZ
Wang
P
P
Wang
X L
XL
Wang
Y
Y
Watanabe
R
R
Wedd
E
E
Won
B D
BD
Yabsley
Y
Y
Yamashita
C Z
CZ
Yuan
Z P
ZP
Zhang
V
V
Zhulanov
A
A
Zupanc
O
O
Zyukova