Search for a low mass particle decaying into μ+ μ- in B0 → K*0 X and B0 → ρ0 X at Belle.
We search for dimuon decays of a low mass particle in the decays B0→K*0 X and B0→ρ0 X using a data sample of 657×10(6)BB events collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. We find no evidence for such a particle in the mass range from 212  MeV/c2 to 300  MeV/c2 for lifetimes below 10(-12)  s, and set upper limits on its branching fractions. In particular, we search for a particle with a mass of 214.3  MeV/c2 reported by the HyperCP experiment, and obtain upper limits on the products B(B0→K*0 X)×B(X→μ+ μ- )<2.26(2.27)×10(-8) and B(B0→ρ0 X)×B(X→μ+ μ-)<1.73(1.73)×10(-8) at 90% C.L. for a scalar (vector) X particle.
Hyun
H J
HJ
Kyungpook National University, Taegu.
Park
H K
HK
Kim
H O
HO
Park
H
H
Aihara
H
H
Arinstein
K
K
Aushev
T
T
Bakich
A M
AM
Barberio
E
E
Bay
A
A
Belous
K
K
Bischofberger
M
M
Bondar
A
A
Bozek
A
A
Bracko
M
M
Chang
M-C
MC
Chang
P
P
Chao
Y
Y
Chen
A
A
Chen
P
P
Cheon
B G
BG
Cho
I-S
IS
Choi
Y
Y
Dalseno
J
J
Danilov
M
M
Dash
M
M
Drutskoy
A
A
Eidelman
S
S
Gabyshev
N
N
Golob
B
B
Ha
H
H
Hara
T
T
Horii
Y
Y
Hoshi
Y
Y
Hou
W-S
WS
Hsiung
Y B
YB
Inami
K
K
Iwasaki
Y
Y
Joshi
N J
NJ
Kah
D H
DH
Kang
J H
JH
Kapusta
P
P
Kawasaki
T
T
Kichimi
H
H
Kiesling
C
C
Kim
H J
HJ
Kim
J H
JH
Kim
M J
MJ
Ko
B R
BR
Kodys
P
P
Krizan
P
P
Kuzmin
A
A
Kwon
Y-J
YJ
Kyeong
S-H
SH
Lange
J S
JS
Lee
S-H
SH
Li
J
J
Liventsev
D
D
Louvot
R
R
Matyja
A
A
McOnie
S
S
Miyabayashi
K
K
Miyata
H
H
Miyazaki
Y
Y
Mohanty
G B
GB
Nakano
E
E
Nakazawa
H
H
Nishida
S
S
Nishimura
K
K
Nitoh
O
O
Ohshima
T
T
Okuno
S
S
Olsen
S L
SL
Palka
H
H
Park
C W
CW
Pestotnik
R
R
Petric
M
M
Piilonen
L E
LE
Ryu
S
S
Sahoo
H
H
Sakai
Y
Y
Schneider
O
O
Sevior
M E
ME
Shapkin
M
M
Shiu
J-G
JG
Shwartz
B
B
Singh
J B
JB
Stanic
S
S
Staric
M
M
Sumiyoshi
T
T
Suzuki
S
S
Teramoto
Y
Y
Trabelsi
K
K
Uehara
S
S
Unno
Y
Y
Uno
S
S
Varner
G
G
Varvell
K E
KE
Vervink
K
K
Wang
C H
CH
Wang
M-Z
MZ
Wang
P
P
Wang
X L
XL
Wedd
R
R
Won
E
E
Yabsley
B D
BD
Yamashita
Y
Y
Zhang
Z P
ZP
Zhilich
V
V
Zyukova
O
O
D000465:Algorithms; D004735:Energy Transfer; D007477:Ions; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry*; D009686:Nuclear Physics; D010315:Particle Accelerators
D007477:Ions