Observation of B+-->K1(1270)+gamma.
We report the observation of the radiative decay B+-->K1(1270)(+) gamma using a data sample of 140 fb(-1) taken at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- collider. We find the branching fraction to be B(B+-->K1(1270)(+)gamma)=(4.3+/-0.9(stat.)+/-0.9(syst.))x10(-5) with a significance of 7.3sigma. We find no significant signal for B+-->K1(1400)(+)gamma and set an upper limit B(B+-->K1(1400)(+)gamma)<1.5 x 10(-5) at the 90% confidence level. We also measure inclusive branching fractions for B+-->K+pi+pi-gamma and B0-->K0pi+pi-gamma in the mass range 1 GeV/c(2)<M(K+(0)pi+pi-)<2 GeV/c(2).
Yang
Heyoung
H
Seoul National University, Seoul, Korea.
Nakao
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Abe
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Abe
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Aihara
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Asano
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Aushev
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Bahinipati
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Bedny
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Bondar
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Bozek
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Bracko
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Brodzicka
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Browder
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Chang
M-C
MC
Chang
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Chao
Y
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Chen
A
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Chen
W T
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Cheon
B G
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Chistov
R
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Choi
S-K
SK
Choi
Y
Y
Choi
Y K
YK
Chuvikov
A
A
Cole
S
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Dalseno
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Dash
M
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Eidelman
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Enari
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Fang
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Gabyshev
N
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Garmash
A
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Gershon
T
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Gokhroo
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Golob
B
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Haba
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Hayasaka
K
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Hayashii
H
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Hazumi
M
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Hinz
L
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Hokuue
T
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Hoshi
Y
Y
Hsiung
Y B
YB
Iijima
T
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Imoto
A
A
Inami
K
K
Iwasaki
Y
Y
Kang
J H
JH
Kang
J S
JS
Kataoka
S U
SU
Katayama
N
N
Kawai
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Kawasaki
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Khan
H R
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Kichimi
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Kim
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S K
SK
Kim
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Kim
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Kinoshita
K
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Korpar
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Krokovny
P
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Kuo
C C
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Kuzmin
A
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Kwon
Y-J
YJ
Lange
J S
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Leder
G
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Lee
S H
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Lesiak
T
T
Li
J
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Lin
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SW
Majumder
G
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Matsumoto
T
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Matyja
A
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Mitaroff
W
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Miyabayashi
K
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Miyake
H
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Miyata
H
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Mizuk
R
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Nagamine
T
T
Nagasaka
Y
Y
Nakano
E
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Natkaniec
Z
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Nishida
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Nitoh
O
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Ogawa
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Ohshima
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Okabe
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Okuno
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Olsen
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Ostrowicz
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Pakhlov
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Palka
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Park
C W
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Parslow
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Pestotnik
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Piilonen
L E
LE
Rozanska
M
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Sagawa
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Sakai
Y
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Sato
N
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Schietinger
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Schneider
O
O
Schümann
J
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Schwanda
C
C
Schwartz
A J
AJ
Seuster
R
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Shibuya
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Somov
A
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Soni
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N
Stamen
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Stanic
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Staric
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M
Sumisawa
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Sumiyoshi
T
T
Suzuki
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Suzuki
S Y
SY
Tajima
O
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Takasaki
F
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Tamura
N
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Tanaka
M
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Taylor
G N
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Teramoto
Y
Y
Tian
X C
XC
Tsukamoto
T
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Uehara
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Uglov
T
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Ueno
K
K
Uno
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Ushiroda
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Varner
G
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Varvell
K E
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Villa
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Wang
C H
CH
Wang
M-Z
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Watanabe
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Yamaguchi
A
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Yamashita
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Y
Yamauchi
M
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Yuan
Y
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Zhang
L M
LM
Zhang
Z P
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Zhilich
V
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Zontar
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Zürcher
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