Measurement of branching fractions, isospin, and CP-violating asymmetries for exclusive b-->dgamma modes.
We report new measurements of the decays B+-->rho+gamma, B0-->rho0gamma, and B0-->omegagamma using a data sample of 657x10(6) B meson pairs accumulated with the Belle detector at the KEKB e+e- collider. We measure branching fractions B(B+-->rho+gamma)=(8.7_-2.7-1.1;+2.9+0.9)x10(-7), B(B0-->rho0gamma)=(7.8_-1.6-1.0;+1.7+0.9)x10(-7), and B(B0-->omegagamma)=(4.0_-1.7;+1.9+/-1.3)x10(-7). We also report the isospin asymmetry Delta(rhogamma)=-0.48_-0.19-0.09;+0.21+0.08 and the first measurement of the direct CP-violating asymmetry ACP(B+-->rho+gamma)=-0.11+/-0.32+/-0.09, where the first and second errors are statistical and systematic, respectively.
Taniguchi
N
N
Kyoto University, Kyoto.
Nakao
M
M
Nishida
S
S
Adachi
I
I
Aihara
H
H
Arinstein
K
K
Aushev
T
T
Aziz
T
T
Bakich
A M
AM
Balagura
V
V
Bay
A
A
Belous
K
K
Bhardwaj
V
V
Bitenc
U
U
Bondar
A
A
Bozek
A
A
Bracko
M
M
Browder
T E
TE
Chang
M-C
MC
Chang
P
P
Chao
Y
Y
Chen
A
A
Chen
K-F
KF
Chen
W T
WT
Cheon
B G
BG
Chiang
C-C
CC
Cho
I-S
IS
Choi
Y
Y
Dalseno
J
J
Dash
M
M
Drutskoy
A
A
Dungel
W
W
Eidelman
S
S
Golob
B
B
Ha
H
H
Haba
J
J
Hara
T
T
Hayasaka
K
K
Hayashii
H
H
Hazumi
M
M
Hoshi
Y
Y
Hou
W-S
WS
Hyun
H J
HJ
Iijima
T
T
Inami
K
K
Ishikawa
A
A
Ishino
H
H
Itoh
R
R
Iwabuchi
M
M
Iwasaki
M
M
Iwasaki
Y
Y
Joshi
N J
NJ
Kah
D H
DH
Kaji
H
H
Kang
J H
JH
Kawai
H
H
Kawasaki
T
T
Kichimi
H
H
Kim
S K
SK
Kim
Y I
YI
Kim
Y J
YJ
Kinoshita
K
K
Korpar
S
S
Krizan
P
P
Krokovny
P
P
Kumar
R
R
Kuzmin
A
A
Kwon
Y-J
YJ
Kyeong
S-H
SH
Lange
J S
JS
Lee
J S
JS
Lee
S E
SE
Lesiak
T
T
Limosani
A
A
Lin
S-W
SW
Liu
C
C
Liu
Y
Y
Liventsev
D
D
Mandl
F
F
McOnie
S
S
Miyabayashi
K
K
Miyazaki
Y
Y
Moloney
G R
GR
Nagasaka
Y
Y
Nakamura
I
I
Nakano
E
E
Nakazawa
H
H
Natkaniec
Z
Z
Nitoh
O
O
Nozaki
T
T
Ogawa
S
S
Ohshima
T
T
Okuno
S
S
Olsen
S L
SL
Ozaki
H
H
Pakhlov
P
P
Pakhlova
G
G
Park
C W
CW
Park
H
H
Park
H K
HK
Park
K S
KS
Peak
L S
LS
Piilonen
L E
LE
Sahoo
H
H
Sakai
Y
Y
Sasao
N
N
Schneider
O
O
Schümann
J
J
Schwanda
C
C
Schwartz
A J
AJ
Seidl
R
R
Senyo
K
K
Sevior
M E
ME
Shapkin
M
M
Shen
C P
CP
Shiu
J-G
JG
Shwartz
B
B
Singh
J B
JB
Sokolov
A
A
Stanic
S
S
Staric
M
M
Sumisawa
K
K
Sumiyoshi
T
T
Suzuki
S Y
SY
Tamura
N
N
Taylor
G N
GN
Teramoto
Y
Y
Tikhomirov
I
I
Trabelsi
K
K
Tsuboyama
T
T
Uehara
S
S
Uglov
T
T
Unno
Y
Y
Uno
S
S
Urquijo
P
P
Varner
G
G
Wang
C H
CH
Wang
M-Z
MZ
Wang
P
P
Wang
X L
XL
Watanabe
Y
Y
Wedd
R
R
Wicht
J
J
Won
E
E
Yabsley
B D
BD
Yamashita
Y
Y
Yusa
Y
Y
Zhang
Z P
ZP
Zhilich
V
V
Zhulanov
V
V
Zivko
T
T
Zupanc
A
A
Zyukova
O
O