Observation of the D1(2420)-->Dpi + pi- decays.
We report on the first observation of D0/1(2420)-->D0pi- pi+ and D+/1(2420-->D+ pi- pi+ decays (where the contribution from the dominant known D1-->D*pi decay mode is excluded) in the B- -->D0/1pi-) and (-)B0-->D+/1pi- decays, respectively. The observation is based on 15.2 x 10(7) B(-)B events collected with the Belle detector at the KEKB collider. We also set 90% confidence level upper limits for the branching fractions of the four following decays: B- -->D0/1pi-, D01-->D(*0)pi- pi+, (-)B0-->D+/1pi-, D+/1-->D(*+) pi- pi+, B- -->D(*0)2(2460)pi-, D(*0)2 -->D(*0) pi- pi+, (-)B0-->D(*+)2(2460)pi-, D(*+)2-->D(*+)pi- pi+.
Abe
K
K
High Energy Accelerator Research Organization (KEK), Tsukuba, Japan.
Abe
K
K
Adachi
I
I
Aihara
H
H
Akatsu
M
M
Anipko
D
D
Asano
Y
Y
Aushev
T
T
Aziz
T
T
Bahinipati
S
S
Bakich
A M
AM
Banerjee
S
S
Bedny
I
I
Bitenc
U
U
Bizjak
I
I
Blyth
S
S
Bondar
A
A
Bozek
A
A
Bracko
M
M
Brodzicka
J
J
Chang
P
P
Chao
Y
Y
Chen
A
A
Chen
K-F
KF
Chen
W T
WT
Cheon
B G
BG
Chistov
R
R
Choi
S-K
SK
Choi
Y
Y
Chuvikov
A
A
Dalseno
J
J
Danilov
M
M
Dash
M
M
Drutskoy
A
A
Eidelman
S
S
Eiges
V
V
Fang
F
F
Fratina
S
S
Gabyshev
N
N
Garmash
A
A
Gershon
T
T
Gokhroo
G
G
Golob
B
B
Haba
J
J
Hastings
N C
NC
Hayasaka
K
K
Hayashii
H
H
Hazumi
M
M
Higuchi
T
T
Hinz
L
L
Hokuue
T
T
Hoshi
Y
Y
Hou
S
S
Hou
W-S
WS
Iijima
T
T
Imoto
A
A
Inami
K
K
Ishikawa
A
A
Itoh
R
R
Iwasaki
Y
Y
Kang
J H
JH
Kang
J S
JS
Kapusta
P
P
Kataoka
S U
SU
Katayama
N
N
Kawai
H
H
Kawasaki
T
T
Kichimi
H
H
Kim
H J
HJ
Kim
J H
JH
Kim
S K
SK
Kim
S M
SM
Kinoshita
K
K
Koppenburg
P
P
Korpar
S
S
Krizan
P
P
Krokovny
P
P
Kuo
C C
CC
Kuzmin
A
A
Kwon
Y-J
YJ
Leder
G
G
Lee
S H
SH
Lesiak
T
T
Li
J
J
Lin
S-W
SW
Liventsev
D
D
MacNaughton
J
J
Majumder
G
G
Mandl
F
F
Matsumoto
T
T
Matyja
A
A
Mitaroff
W
W
Miyata
H
H
Mizuk
R
R
Nagamine
T
T
Nagasaka
Y
Y
Nakano
E
E
Natkaniec
Z
Z
Nishida
S
S
Nitoh
O
O
Ogawa
S
S
Ohshima
T
T
Okabe
T
T
Okuno
S
S
Olsen
S L
SL
Ostrowicz
W
W
Ozaki
H
H
Pakhlov
P
P
Palka
H
H
Park
C W
CW
Parslow
N
N
Pestotnik
R
R
Piilonen
L E
LE
Poluektov
A
A
Sagawa
H
H
Sakai
Y
Y
Sato
N
N
Schietinger
T
T
Schneider
O
O
Schümann
J
J
Semenov
S
S
Senyo
K
K
Seuster
R
R
Shibuya
H
H
Shwartz
B
B
Singh
J B
JB
Somov
A
A
Soni
N
N
Stamen
R
R
Stanic
S
S
Staric
M
M
Sumisawa
K
K
Sumiyoshi
T
T
Suzuki
S
S
Suzuki
S Y
SY
Tajima
O
O
Takasaki
F
F
Tamai
K
K
Tamura
N
N
Tanaka
M
M
Teramoto
Y
Y
Tian
X C
XC
Tsukamoto
T
T
Uehara
S
S
Uglov
T
T
Ueno
K
K
Uno
S
S
Varvell
K E
KE
Villa
S
S
Wang
C C
CC
Wang
C H
CH
Watanabe
M
M
Yabsley
B D
BD
Yamaguchi
A
A
Yamashita
Y
Y
Yamauchi
M
M
Ying
J
J
Yusa
Y
Y
Zhang
C C
CC
Zhang
J
J
Zhang
L M
LM
Zhang
Z P
ZP
Zhilich
V
V
Zontar
D
D