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research
Evidence of
Υ
(
1
S
)
→
J
/
ψ
+
χ
c
1
\Upsilon(1S) \to J/\psi+\chi_{c1}
Υ
(
1
S
)
→
J
/
ψ
+
χ
c
1
and search for double-charmonium production in
Υ
(
1
S
)
\Upsilon(1S)
Υ
(
1
S
)
and
Υ
(
2
S
)
\Upsilon(2S)
Υ
(
2
S
)
decays
Authors
A. Abdesselam
I. Adachi
+157 more
H. Aihara
S. Al Said
K. Arinstein
D. M. Asner
V. Aulchenko
T. Aushev
R. Ayad
A. M. Bakich
Y. Ban
V. Bansal
P. Behera
Belle Collaboration
B. Bhuyan
A. Bobrov
A. Bozek
M. Bračko
T. E. Browder
Vladimir Chekelian
A. Chen
B. G. Cheon
K. Chilikin
R. Chistov
K. Cho
V. Chobanova
S. -K. Choi
Y. Choi
D. Cinabro
J. Dalseno
M. Danilov
J. Dingfelder
Z. Doležal
A. Drutskoy
Z. Drásal
K. Dutta
S. Eidelman
H. Farhat
J. E. Fast
Torben Ferber
N. Gabyshev
S. Ganguly
A. Garmash
V. Gaur
R. Gillard
Y. M. Goh
B. Golob
J. Haba
T. Hara
K. Hayasaka
H. Hayashii
X. H. He
W. -S. Hou
M. Huschle
T. Iijima
K. Inami
A. Ishikawa
Ryosuke Itoh
I. Jaegle
D. Joffe
K. K. Joo
T. Julius
T. Kawasaki
D. Y. Kim
H. J. Kim
J. B. Kim
J. H. Kim
K. T. Kim
K. Kinoshita
B. R. Ko
Peter Kodys
Samo Korpar
Peter Krizan
P. Krokovny
A. Kuzmin
Y. -J. Kwon
Jens Sören Lange
L. Li Gioi
J. Li
Y. Li
J. Libby
D. Liventsev
P. Lukin
K. Miyabayashi
H. Miyata
A. Moll
R. Mussa
E. Nakano
Mikihiko Nakao
T. Nanut
N. K. Nisar
S. Nishida
S. Okuno
Waclaw Ostrowicz
C. W. Park
H. Park
T. K. Pedlar
Rok Pestotnik
M. Petrič
L. E. Piilonen
E. Ribežl
M. Ritter
Armine Rostomyan
Y. Sakai
S. Sandilya
L. Santelj
T. Sanuki
O. Schneider
G. Schnell
C. Schwanda
D. Semmler
K. Senyo
V. Shebalin
C. P. Shen
T. -A. Shibata
J. -G. Shiu
B. Shwartz
A. Sibidanov
F. Simon
Y. -S. Sohn
A. Sokolov
Marko Staric
Michael Steder
T. Sumiyoshi
U. Tamponi
K. Tanida
G. Tatishvili
Y. Teramoto
M. Uchida
S. Uehara
T. Uglov
Y. Unno
S. Uno
P. Urquijo
Y. Usov
S. E. Vahsen
C. Van Hulse
P. Vanhoefer
G. Varner
A. Vinokurova
V. Vorobyev
A. Vossen
M. N. Wagner
C. H. Wang
M. -Z. Wang
P. Wang
X. L. Wang
M. Watanabe
Y. Watanabe
E. Won
J. Yamaoka
S. D. Yang
Sergey Yashchenko
Y. Yook
C. Z. Yuan
Z. P. Zhang
V. Zhilich
V. Zhulanov
D. Červenkov
Publication date
1 January 2014
Publisher
'American Physical Society (APS)'
Doi
Cite
View
on
arXiv
Abstract
Using data samples of
102
×
1
0
6
102\times10^6
102
×
1
0
6
Υ
(
1
S
)
\Upsilon(1S)
Υ
(
1
S
)
and
158
×
1
0
6
158\times10^6
158
×
1
0
6
Υ
(
2
S
)
\Upsilon(2S)
Υ
(
2
S
)
events collected with the Belle detector, a first experimental search has been made for double-charmonium production in the exclusive decays
Υ
(
1
S
,
2
S
)
→
J
/
ψ
(
ψ
′
)
+
X
\Upsilon(1S,2S)\rightarrow J/\psi(\psi')+X
Υ
(
1
S
,
2
S
)
→
J
/
ψ
(
ψ
′
)
+
X
, where
X
=
η
c
X=\eta_c
X
=
η
c
,
χ
c
J
(
J
=
0
,
1
,
2
)
\chi_{cJ} (J=~0,~1,~2)
χ
c
J
(
J
=
0
,
1
,
2
)
,
η
c
(
2
S
)
\eta_c(2S)
η
c
(
2
S
)
,
X
(
3940
)
X(3940)
X
(
3940
)
, and
X
(
4160
)
X(4160)
X
(
4160
)
. No significant signal is observed in the spectra of the mass recoiling against the reconstructed
J
/
ψ
J/\psi
J
/
ψ
or
ψ
′
\psi'
ψ
′
except for the evidence of
χ
c
1
\chi_{c1}
χ
c
1
production with a significance of
4.6
σ
4.6\sigma
4.6
σ
for
Υ
(
1
S
)
→
J
/
ψ
+
χ
c
1
\Upsilon(1S)\rightarrow J/\psi+\chi_{c1}
Υ
(
1
S
)
→
J
/
ψ
+
χ
c
1
. The measured branching fraction
\BR(\Upsilon(1S)\rightarrow J/\psi+\chi_{c1})
is
(
3.90
±
1.21
(
s
t
a
t
.
)
±
0.23
(
s
y
s
t
.
)
)
×
1
0
−
6
(3.90\pm1.21(\rm stat.)\pm0.23 (\rm syst.))\times10^{-6}
(
3.90
±
1.21
(
stat.
)
±
0.23
(
syst.
))
×
1
0
−
6
. The
90
%
90\%
90%
confidence level upper limits on the branching fractions of the other modes having a significance of less than
3
σ
3\sigma
3
σ
are determined. These results are consistent with theoretical calculations using the nonrelativistic QCD factorization approach.Comment: 12 pages, 4 figures, 1 table. The fit range was extended to include X(4160) signal according to referee's suggestions. Other results unchanged. Paper was accepted for publication as a regular article in Physical Review
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