Using 6.32 fb–1 of electron-positron collision data recorded by the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV, we present the first search for the decay $D^{+}_{s}$ → ...a0(980)0e+νe, a0(980)0 → π0η, which could proceed via a0(980) – f0(980) mixing. No significant signal is observed. An upper limit of 1.2 × 10–4 at the 90% confidence level is set on the product of the branching fractions of $D^{+}_{s}$ → a0(980)0e+νe and a0(980)0 → π0η decays.
Using the data samples collected in the energy range from 3.773 to 4.600 GeV with the BESIII detector at the BEPCII collider, we measure the dressed cross sections as a function of center-of-mass ...energy for e(+)e(-) -> K+K- pi(+)pi(-) (pi(0)), K+K-K+K- (pi(0)), pi(+)pi(-) pi(+)pi(-) (pi(0)), and p (p) over bar pi(+)pi(-)(pi(0)). The cross sections for e(+)e(-) -> K+K-K+K- pi(0), p (p) over bar pi(+)pi(-)(pi(0)) are the first measurements. Cross sections for the other five channels are much more precise than previous results in this energy region. We also search for charmonium and charmonium-like resonances, such as the Y(4230), decaying into the same final states. We find evidence of the psi(4040) decaying to pi(+)pi(-) pi(+)pi(-) pi(0) with a statistical significance of 3.6 sigma. Upper limits are provided for other decays since no clear signals are observed.
Using (10.087±0.044)×109 J/ψ events collected by the Beijing Spectrum III (BESIII) detector at the Beijing Electron Positron Collider II (BEPCII) collider, we search for the hyperon semileptonic ...decay ... . No significant signal is observed and the upper limit on the branching fraction ... is set to be 2.59×10−4 at 90% confidence level. This result is one order of magnitude more strict than the previous best limit.(ProQuest: … denotes formulae omitted.)
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
.
Gout is a chronic disease resulting from elevated serum urate (SU). Previous genome-wide association studies (GWAS) have identified dozens of susceptibility loci for SU/gout, but few have been ...conducted for Chinese descent. Here, we try to extensively investigate whether these loci contribute to gout risk in Han Chinese. A total of 2255 variants in linkage disequilibrium (LD) with GWAS identified SU/gout associated variants were analyzed in a Han Chinese cohort of 1255 gout patients and 1848 controls. Cumulative genetic risk score analysis was performed to assess the cumulative effect of multiple "risk" variants on gout incidence. 23 variants (41%) of LD pruned variants set (n = 56) showed nominal association with gout in our sample (p < 0.05). Some of the previously reported gout associated loci (except ALDH16A1), including ABCG2, SLC2A9, GCKR, ALDH2 and CNIH2, were replicated. Cumulative genetic risk score analyses showed that the risk of gout increased for individuals with the growing number (≥8) of the risk alleles on gout associated loci. Most of the gout associated loci identified in previous GWAS were confirmed in an independent Chinese cohort, and the SU associated loci also confer susceptibility to gout. These findings provide important information of the genetic association of gout.
With the charged-particle decay spectroscopy extended to the proton drip-line region, half-lives of nuclei of interest decrease rapidly. Consequently, severe signal piling-up resulting from the ...implanted ions and their successive decays in position sensitive detectors become more and more common. To extract the spectroscopic information from the pile-up pulses with good accuracy, a digital pulse analysis algorithm is presented in this paper and validated with the α decay of 219Th and the internal conversion electron decays of 210,211Ra isomers, all of which have ∼μs half-lives. The results show that with proper baseline correction, standard pulse construction and plateau-region fitting etc., the spectroscopic information of overlapping signals with time separation down to 80 ns and amplitude of individual pile-up pulse down to 70 keV, can be readily extracted.
The process e+e− → ϕη is studied at 22 center-of-mass energy points (√s) between 2.00 and 3.08 GeV using 715 pb−1 of data collected with the BESIII detector. The measured Born cross section of e+e− → ...ϕη is found to be consistent with BABAR measurements, but with improved precision. A resonant structure around 2.175 GeV is observed with a significance of 6.9 σ with mass (2163.5 ± 6.2 ± 3.0) MeV/c2 and width (31.1+21.1−11.6 ± 1.1) MeV, where the first uncertainties are statistical and the second are systematic.
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