Observation of a vector charmoniumlike state in e + e − → D + s D s 1 ( 2536 ) − + c . c .
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Date
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Abstract
Using a data sample of
921.9
fb
−
1
collected with the Belle detector, we study the process of
e
+
e
−
→
D
+
s
D
s
1
(
2536
)
−
+
c
.
c
.
via initial-state radiation. We report the first observation of a vector charmoniumlike state decaying to
D
+
s
D
s
1
(
2536
)
−
+
c
.
c
.
with a significance of
5.9
σ
, including systematic uncertainties. The measured mass and width are
(
4625.9
+
6.2
−
6.0
(
stat
)
±
0.4
(
syst
)
)
MeV
/
c
2
and
(
49.8
+
13.9
−
11.5
(
stat
)
±
4.0
(
syst
)
)
MeV
, respectively. The product of the
e
+
e
−
→
D
+
s
D
s
1
(
2536
)
−
+
c
.
c
.
cross section and the branching fraction of
D
s
1
(
2536
)
−
→
¯
D
*
0
K
−
is measured from the
D
s
¯
D
s
1
(
2536
)
threshold to 5.59 GeV.
Description
Only IISERM authors are available in the record.
Keywords
Citation
Physical Review D, 100(11).