Recently, researches on copy number variation （CNV） have extended to every field, such as etiological exploration and precise treatment of complex diseases, as well as genetic breeding and evolution. ...The unique genetic characteristics of CNV have made people gradually believe that it could be used as a biological genetic marker to solve related problems. With the development of detection technology, application of CNV in forensic medicine will increase gradually. In this paper, the concept and development of CNV, as well as its application in forensic medicine are summarized, to provide new ideas for the practical application of CNV in the future.
The complex excited energy levels in the diode-pumped metastable Ar laser may induce harmful effects in laser cycling. Significantly, the influence of the population distribution in 2p energy levels ...on the laser performance is unclear yet. In this work, the absolute populations in all the 2p states were measured online by the simultaneous applications of tunable diode laser absorption spectroscopy and optical emission spectroscopy. The results showed that most atoms were populated to the 2p
, 2p
, and 2p
levels while lasing, and the majority of the 2p
population was efficiently transferred to the 2p
level with the aid of helium, which was beneficial for the laser performance.
A
bstract
Based on 4.5 fb
−
1
e
+
e
−
collision data collected with BESIII detector at seven energy points between 4.600 and 4.699 GeV, the branching fractions for
Λ
c
+
→
pη
and
Λ
c
+
→
pω
were ...measured by means of single-tag method. The branching fractions of
Λ
c
+
→
pη
and
Λ
c
+
→
pω
are determined to be (1.57
±
0.11
stat
±
0.04
syst
)
×
10
−
3
and (1.11
±
0.20
stat
±
0.07
syst
)
×
10
−
3
, with a statistical significance of greater than 10
σ
and 5.7
σ
, respectively. These results are consistent with the previous measurements by BESIII, LHCb and Belle, and the result of
Λ
c
+
→
pη
is the most precise to date.
A
bstract
Using (10087 ± 44) × 10
6
J
/
ψ
events collected with the BESIII detector at the BEPCII
e
+
e
−
storage ring at the center-of-mass energy of
s
= 3.097 GeV, we present a search for the rare ...semi-muonic charmonium decay
J
/
ψ
→
D
−
μ
+
ν
μ
+ c.c.. Since no significant signal is observed, we set an upper limit of the branching fraction to be
B
(
J
/
ψ
→
D
−
μ
+
ν
μ
+ c.c.) < 5.6 × 10
−
7
at 90% confidence level. This is the first search for the weak decay of charmonium with a muon in the final state.
Observation of ψ(3686) →Ω−K+Ξ¯0 + c.c Ai, X. C.; Bakina, O.; Balossino, I. ...
The journal of high energy physics,
04/2024, Letnik:
2024, Številka:
4
Journal Article
Recenzirano
Odprti dostop
A
bstract
Using (27
.
12
±
0
.
14)
×
10
8
ψ
(3686) events collected with the BESIII detector at BEPCII, the decay of
ψ
(3686)
→
Ω
−
K
+
Ξ
¯
0
+ c
.
c
.
is observed for the first time. The branching ...fraction of this decay is measured to be
B
ψ
3686
→
Ω
−
K
+
Ξ
¯
0
+
c
.
c
.
= (2
.
78 ± 0
.
40 ± 0
.
18) × 10
−
6
, where the first uncertainty is statistical and the second is systematic. Possible baryon excited states are searched for in this decay, but no evident intermediate state is observed with the current sample size.
A
bstract
Based on
e
+
e
−
collision data collected at center-of-mass energies from 2.000 to 3.080 GeV by the BESIII detector at the BEPCII collider, a partial wave analysis is performed for the ...process
e
+
e
−
→
K
S
0
K
L
0
π
0
. The results allow the Born cross sections of the process
e
+
e
−
→
K
S
0
K
L
0
π
0
, as well as its subprocesses
e
+
e
−
→
K
∗
(892)
0
K
¯
0
and
K
2
∗
(1430)
0
K
¯
0
to be measured. The Born cross sections for
e
+
e
−
→
K
S
0
K
L
0
π
0
are consistent with previous measurements by BaBar, but with substantially improved precision. The Born cross section lineshape of the process
e
+
e
−
K
∗
(892)
0
K
¯
0
is consistent with a vector meson state around 2.2 GeV with a significance of 3.2
σ
. A Breit-Wigner fit determines its mass as
M
Y
= (2164
.
7
±
9
.
1
±
3
.
1) MeV
/c
2
and its width as Γ
Y
= (32
.
4
±
21
.
0
±
1
.
8) MeV.
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.
A segmented primary mirror (PM) is an efficient solution to the problems of a monolithic PM manufacture, testing, transportation, and launch. However, the problem of the radius of curvature (ROC) ...matching among PM segments will arise, which if not solved will seriously degrade the final imaging quality of the system. Accurately detecting ROC mismatch among PM segments from the wavefront map is of crucial importance for efficiently correcting this kind of manufacturing error, while currently there are few related studies. Based on the inherent relation between the PM segment's ROC error and corresponding sub-aperture defocus aberration, this paper proposes that the ROC mismatch can be accurately estimated from the sub-aperture defocus aberration. Secondary mirror (SM) lateral misalignments will influence the accuracy of estimating ROC mismatch. A strategy is also proposed to reduce the influence of SM lateral misalignments. Detailed simulations are performed to demonstrate the effectiveness of the proposed method for detecting ROC mismatch among PM segments. This paper paves a road for detecting ROC mismatch using image-based wavefront sensing methods.
Study of η′ → π+π−l+l− decays at BESIII Ai, X. C.; Bakina, O.; Balossino, I. ...
The journal of high energy physics,
16/7, Letnik:
2024, Številka:
7
Journal Article
Recenzirano
Odprti dostop
A
bstract
With a sample of (10087
±
44)
×
10
6
J/ψ
events accumulated with the BESIII detector, we analyze the decays
η
′
→ π
+
π
−
l
+
l
−
(
l
=
e, μ
) via the process
J/ψ → γη
′. The branching ...fractions are measured to be
B
(
η
′
→ π
+
π
−
e
+
e
−
) = (2
.
45
±
0
.
02(stat
.
)
±
0
.
08(syst
.
))
×
10
−
3
and
B
(
η
′
→ π
+
π
−
μ
+
μ
−
) = (2
.
16
±
0
.
12(stat
.
)
±
0
.
06(syst
.
))
×
10
−
5
, and the ratio is
B
η
′
→
π
+
π
−
e
+
e
−
B
η
′
→
π
+
π
−
μ
+
μ
−
=
113.4
±
0.9
stat
.
±
3.7
syst
.
. In addition, by combining the
η
′ →
π
+
π
−
e
+
e
−
and
η
′ →
π
+
π
−
μ
+
μ
−
decays, the slope parameter of the electromagnetic transition form factor is measured to be
b
η
′
= 1.30 ± 0.19 (GeV
/c
2
)
−
2
, which is consistent with previous measurements from BESIII and theoretical predictions from the VMD model. The asymmetry in the angle between the
π
+
π
−
and
l
+
l
−
decay planes, which has the potential to reveal the
CP
-violation originating from an unconventional electric dipole transition, is also investigated. The asymmetry parameters are determined to be
A
CP
η
′
→
π
+
π
−
e
+
e
−
=
−
0.21
±
0.73
stat
.
±
0.01
syst
.
%
and
A
CP
η
′
→
π
+
π
−
μ
+
μ
−
=
0.62
±
4.71
stat
.
±
0.08
syst
.
%
, implying that no evidence of
CP
-violation is observed at the present statistics. Finally, an axion-like particle is searched for via the decay
η
′ →
π
+
π
−
a, a
→
e
+
e
−
, and upper limits of the branching fractions are presented for the mass assumptions of the axion-like particle in the range of 0
−
500 MeV
/c
2
.
A
bstract
Using 24.1 fb
−
1
of
e
+
e
−
collision data collected with the BESIII detector at the BEPCII collider, the Born cross sections and effective form factors of the
e
+
e
−
→
Σ
+
Σ
¯
−
reaction ...are measured. The measurements are performed at center-of-mass energies ranging from 3.510 to 4.951 GeV. No significant evidence for the decay of the charmonium(-like) states,
ψ
(3770),
ψ
(4040),
ψ
(4160),
Y
(4230),
Y
(4360),
ψ
(4415), and
Y
(4660), into a
Σ
+
Σ
¯
−
final state is observed. Consequently, upper limits for the products of the branching fractions and the electronic partial widths at the 90% confidence level are reported for these decays.
