A
bstract
Using a sample of (10
.
09
±
0
.
04)
×
10
9
J/ψ
decays collected with the BESIII detector, partial wave analyses of the decay
J
/
ψ
→
γ
K
S
0
K
S
0
π
0
are performed within the
K
S
0
K
S
0
...π
0
invariant mass region below 1.6 GeV/
c
2
. The covariant tensor amplitude method is used in both mass independent and mass dependent approaches. Both analysis approaches exhibit dominant pseudoscalar and axial vector components, and show good consistency for the other individual components. Furthermore, the mass dependent analysis reveals that the
K
S
0
K
S
0
π
0
invariant mass spectrum for the pseudoscalar component can be well described with two isoscalar resonant states using relativistic Breit-Wigner model, i.e., the
η
(1405) with a mass of
1391.7
±
0.7
−
0.3
+
11.3
MeV/
c
2
and a width of
60.8
±
1.2
−
12.0
+
5.5
MeV, and the
η
(1475) with a mass of
1507.6
±
1.6
−
32.2
+
15.5
MeV/
c
2
and a width of
115.8
±
2.4
−
10.9
+
14.8
MeV. The first and second uncertainties are statistical and systematic, respectively. Alternate models for the pseudoscalar component are also tested, but the description of the
K
S
0
K
S
0
π
0
invariant mass spectrum deteriorates significantly.
A
bstract
Using 2.93 fb
−
1
of
e
+
e
−
collision data collected with the BESIII detector at the center-of-mass energy 3.773 GeV, we perform the first amplitude analysis of the decay
D
+
→
K
S
0
π
+
π
...0
π
0
and determine the relative magnitudes and phases of different intermediate processes. The absolute branching fraction of
D
+
→
K
S
0
π
+
π
0
π
0
is measured to be (2.888
±
0.058
stat
.
±
0.069
syst
.
)%. The dominant intermediate processes are
D
+
→
K
S
0
a
1
(1260)
+
(
→ ρ
+
π
0
) and
D
+
→
K
¯
*0
ρ
+
, with branching fractions of (8.66
±
1.04
stat
.
±
1.39
syst
.
)
×
10
−
3
and (9.70
±
0.81
stat
.
±
0.53
syst
.
)
×
10
−
3
, respectively.
Cypermethrin contamination was a potential threat to soil organisms. In the present work, reproductive damage in earthworms (Amynthas corticis) exposed to cypermethrin was investigated. It was found ...that earthworms could absorb and accumulate residual cypermethrin in soil, and also earthworm activities helped accelerate the degradation of cypermethrin in soil. The accumulation of cypermethrin in earthworms induced sperm damage, and cypermethrin not only caused the imbalance of calcium homeostasis in earthworm sperm cells by inhibiting earthworm sperm Ca2+-ATP and Ca2+-Mg2+-ATP enzyme activities but also caused barriers in acrosome reaction. It also affected sperm energy supply of earthworms by inhibiting the activity of Na+-K+-ATPase and Mg2+-ATPase of earthworm sperm. Meanwhile, the inhibition of acrosome enzyme activity of earthworm sperm by cypermethrin led to hinder fertilization and reduced cocoon production of earthworms, and the damage of cypermethrin to sperm of earthworm was a significant cause of its reproductive toxicity. The results of the evaluation of IBR index showed that reproductive toxicity of cypermethrin to earthworms reduced with the increasing time. The decreased reproductive toxicity of cypermethrin to earthworms at the later stage of exposure (42–56 d) might be due to a combination of reduced absorption of cypermethrin in soil by earthworms, decreased accumulation of cypermethrin in the body, and improved sperm capacitation.
•Earthworms could absorb and accumulate residual cypermethrin in soil.•Earthworm activities helped accelerate the degradation of cypermethrin in soil.•Damage to earthworm spermatozoa by cypermethrin was a significant cause of its reproductive toxicity.•Changes in sperm viability, acrosome enzyme activity and Ca2+-ATPase activity of earthworms indicated reproductive damage in earthworms.
A
bstract
Using 6
.
32 fb
−
1
of
e
+
e
−
collision data collected at the center-of-mass energies between 4.178 and 4.226 GeV with the BESIII detector, we perform an amplitude analysis of the decay
D
...s
+
→ K
+
π
+
π
−
and determine the amplitudes of the various intermediate states. The absolute branching fraction of
D
s
+
→ K
+
π
+
π
−
is measured to be (6
.
11
±
0
.
18
stat
.
±
0
.
11
syst
.
)
×
10
−
3
. The branching fractions of the dominant intermediate processes
D
s
+
→ K
+
ρ
0
, ρ
0
→ π
+
π
−
and
D
s
+
→ K
*
(892)
0
π
+
, K
*
(892)
0
→ K
+
π
−
are determined to be (1
.
96
±
0
.
19
stat
.
±
0
.
23
syst
.
)
×
10
−
3
and (1
.
85
±
0
.
12
stat
.
±
0
.
13
syst
.
)
×
10
−
3
, respectively. The intermediate resonances
f
0
(500),
f
0
(980), and
f
0
(1370) are observed for the first time in this channel.
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