A
bstract
Using 1310
.
6 × 10
6
J/ψ
and 448
.
1 × 10
6
ψ
(3686) events collected with the BESIII detector, the branching fractions of
J/ψ
decays to Σ
+
Σ
¯
−
is measured to be (10
.
61 ± 0
.
04 ± 0
.
...36) × 10
−
4
, which is significantly more precise than the current world average. The branching fractions of
ψ
(3686) decays to Σ
+
Σ
¯
−
is measured to be (2
.
52 ± 0
.
04 ± 0
.
09) × 10
−
4
, which is consistent with the previous measurements. In addition, the ratio of
B
(
ψ
(3686) → Σ
+
Σ
¯
−
)
/
B
(
J/ψ
→ Σ
+
Σ
¯
−
) is determined to be (23
.
8 ± 1
.
1)% which violates the “12% rule”.
A
bstract
By using 6.32 fb
−
1
of data collected with the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV, we perform an amplitude analysis of the decay
D
s
+
→
K
S
0
π
+
π
0
...and determine the relative fractions and phase differences of different intermediate processes, which include
K
S
0
ρ
(770)
+
,
K
S
0
ρ
(1450)
+
,
K
*
(892)
0
π
+
,
K
*
(892)
+
π
0
, and
K
*
(1410)
0
π
+
. With the detection efficiency based on the amplitude analysis results, the absolute branching fraction is measured to be
ℬ
D
s
+
→
K
S
0
π
+
π
0
=
5.43
±
0.30
stat
±
0.15
syst
×
10
−
3
.
A
bstract
Using a total of 5
.
25 fb
−
1
of
e
+
e
−
collision data with center-of-mass energies from 4.236 to 4.600 GeV, we report the first observation of the process
e
+
e
−
→ ηψ
(2
S
) with a ...statistical significance of 4.9 standard deviations. The data sets were collected by the BESIII detector operating at the BEPCII storage ring. We measure the yield of events integrated over center-of-mass energies and also present the energy dependence of the measured cross section.
A
bstract
By analyzing 4
.
48 × 10
8
ψ
(3686) events collected with the BESIII detector, we observe the decays
χ
cJ
→
nK
S
0
Λ
¯
+ c
.
c
.
(
J
= 0, 1, 2) for the first time, via the radiative ...transition
ψ
(3686) →
γχ
cJ
. The branching fractions are determined to be (6
.
65 ± 0
.
26
stat
± 0
.
41
syst
) × 10
−
4
, (1
.
66 ± 0
.
12
stat
± 0
.
12
syst
) × 10
−
4
, and (3
.
58 ± 0
.
16
stat
± 0
.
23
syst
) × 10
−
4
for
J
= 0, 1, and 2, respectively.
Multiplicities of charged hadrons produced in deep inelastic muon scattering off a
6
LiD target have been measured as a function of the DIS variables
x
Bj
,
Q
2
,
W
2
and the final state hadron ...variables
p
T
and
z
. The
distributions are fitted with a single exponential function at low values of
to determine the dependence of
on
x
Bj
,
Q
2
,
W
2
and
z
. The
z
-dependence of
is shown to be a potential tool to extract the average intrinsic transverse momentum squared of partons,
, as a function of
x
Bj
and
Q
2
in a leading order QCD parton model.
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