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.
Kyoto University, Kyoto.
N
N
Taniguchi
M
M
Nakao
S
S
Nishida
I
I
Adachi
H
H
Aihara
K
K
Arinstein
T
T
Aushev
T
T
Aziz
A M
AM
Bakich
V
V
Balagura
A
A
Bay
K
K
Belous
V
V
Bhardwaj
U
U
Bitenc
A
A
Bondar
A
A
Bozek
M
M
Bracko
T E
TE
Browder
M-C
MC
Chang
P
P
Chang
Y
Y
Chao
A
A
Chen
K-F
KF
Chen
W T
WT
Chen
B G
BG
Cheon
C-C
CC
Chiang
I-S
IS
Cho
Y
Y
Choi
J
J
Dalseno
M
M
Dash
A
A
Drutskoy
W
W
Dungel
S
S
Eidelman
B
B
Golob
H
H
Ha
J
J
Haba
T
T
Hara
K
K
Hayasaka
H
H
Hayashii
M
M
Hazumi
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
Iwabuchi
M
M
Iwasaki
Y
Y
Iwasaki
N J
NJ
Joshi
D H
DH
Kah
H
H
Kaji
J H
JH
Kang
H
H
Kawai
T
T
Kawasaki
H
H
Kichimi
S K
SK
Kim
Y I
YI
Kim
Y J
YJ
Kim
K
K
Kinoshita
S
S
Korpar
P
P
Krizan
P
P
Krokovny
R
R
Kumar
A
A
Kuzmin
Y-J
YJ
Kwon
S-H
SH
Kyeong
J S
JS
Lange
J S
JS
Lee
S E
SE
Lee
T
T
Lesiak
A
A
Limosani
S-W
SW
Lin
C
C
Liu
Y
Y
Liu
D
D
Liventsev
F
F
Mandl
S
S
McOnie
K
K
Miyabayashi
Y
Y
Miyazaki
G R
GR
Moloney
Y
Y
Nagasaka
I
I
Nakamura
E
E
Nakano
H
H
Nakazawa
Z
Z
Natkaniec
O
O
Nitoh
T
T
Nozaki
S
S
Ogawa
T
T
Ohshima
S
S
Okuno
S L
SL
Olsen
H
H
Ozaki
P
P
Pakhlov
G
G
Pakhlova
C W
CW
Park
H
H
Park
H K
HK
Park
K S
KS
Park
L S
LS
Peak
L E
LE
Piilonen
H
H
Sahoo
Y
Y
Sakai
N
N
Sasao
O
O
Schneider
J
J
Schümann
C
C
Schwanda
A J
AJ
Schwartz
R
R
Seidl
K
K
Senyo
M E
ME
Sevior
M
M
Shapkin
C P
CP
Shen
J-G
JG
Shiu
B
B
Shwartz
J B
JB
Singh
A
A
Sokolov
S
S
Stanic
M
M
Staric
K
K
Sumisawa
T
T
Sumiyoshi
S Y
SY
Suzuki
N
N
Tamura
G N
GN
Taylor
Y
Y
Teramoto
I
I
Tikhomirov
K
K
Trabelsi
T
T
Tsuboyama
S
S
Uehara
T
T
Uglov
Y
Y
Unno
S
S
Uno
P
P
Urquijo
G
G
Varner
C H
CH
Wang
M-Z
MZ
Wang
P
P
Wang
X L
XL
Wang
Y
Y
Watanabe
R
R
Wedd
J
J
Wicht
E
E
Won
B D
BD
Yabsley
Y
Y
Yamashita
Y
Y
Yusa
Z P
ZP
Zhang
V
V
Zhilich
V
V
Zhulanov
T
T
Zivko
A
A
Zupanc
O
O
Zyukova