Using a sample of (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector, we perform the first partial wave analysis of ψ(3686)→K+K−η. In addition to the well established states, ϕ(1020), ...ϕ(1680), and K3*(1780), contributions from X(1750), ρ(2150), ρ3(2250), and K2*(1980) are also observed. The X(1750) state is determined to be a 1−− resonance. The simultaneous observation of the ϕ(1680) and X(1750) indicates that the X(1750), with previous observations in photoproduction, is distinct from the ϕ(1680). The masses, widths, branching fractions of ψ(3686)→K+K−η, and the intermediate resonances are also measured.
The production fractions of B¯s0 and Λb0 hadrons, normalized to the sum of B− and B¯0 fractions, are measured in 13 TeV pp collisions using data collected by the LHCb experiment, corresponding to an ...integrated luminosity of 1.67 fb−1. These ratios, averaged over the b hadron transverse momenta from 4 to 25 GeV and pseudorapidity from 2 to 5, are 0.122±0.006 for B¯s0, and 0.259±0.018 for Λb0, where the uncertainties arise from both statistical and systematic sources. The Λb0 ratio depends strongly on transverse momentum, while the B¯s0 ratio shows a mild dependence. Neither ratio shows variations with pseudorapidity. The measurements are made using semileptonic decays to minimize theoretical uncertainties. In addition, the ratio of D+ to D0 mesons produced in the sum of B¯0 and B− semileptonic decays is determined as 0.359±0.006±0.009, where the uncertainties are statistical and systematic.
Summary
Background
Human papillomavirus (HPV) infection might be one of the potential risk factors for oesophageal cancer. However, the previous epidemiological findings were heterogeneous.
Aim
To ...explore the association between HPV infection and oesophageal cancer risk by means of meta‐analysis.
Methods
Studies on HPV infection and oesophageal cancer were identified, the prevalence of HPV infection and its association with oesophageal cancer risk were quantitatively summarised by meta‐analysis.
Results
A total of 8990 oesophageal squamous cell carcinoma (SCC) patients and 174 oesophageal adenocarcinomas patients were evaluated from 76 included studies. Summarised HPV prevalence in oesophageal SCC was 22.2% 95% confidence interval (CI), 18.3–26.7%, HPV‐16 was the most frequently observed subtype with a summarised prevalence of 11.4% (95% CI: 8.2–15.7%). With respect to oesophageal adenocarcinoma, HPV prevalence was 35.0% (95% CI, 13.2–65.7%) and HPV‐16 prevalence was 11.4% (95% CI: 8.2–15.7%). Due to the limited number of included studies on oesophageal adenocarcinoma, association analyses were performed to oesophageal SCC only. Significant association was observed between HPV infection and oesophageal SCC with a summarised odds ratio of 3.32 (95% CI, 2.26–4.87). According to HPV‐16, the strength of the association was found to be 3.52 (95% CI, 2.04–6.07).
Conclusions
Human papillomavirus infection was observed to be associated with an increased risk of oesophageal SCC in this meta‐analysis. However, due to the evident heterogeneity observed between the included studies and the strength of the association not as strong as observed for cervical cancer and laryngeal cancer, further studies are needed to clarify the relation and its underlying mechanisms.
Using a data sample of (1310.6±7.0)×106 J/ψ events collected with the BESIII detector operating at the BEPCII collider, we perform the first experimental search for invisible decays of a light ...vector meson (V=ω, ϕ) via J/ψ→Vη decays. The decay of η→π+π−π0 is utilized to tag the V meson decaying into the invisible final state. No evidence for a significant invisible signal is observed, and the upper limits on the ratio of branching fractions at the 90% confidence level are determined to be B(ω→invisible)B(ω→π+π−π0)<8.1×10−5 and B(ϕ→invisible)B(ϕ→K+K−)<3.4×10−4. By using the world average values of B(ω→π+π−π0) and B(ϕ→K+K−), the upper limits on the decay branching fractions at the 90% confidence level are set as B(ω→invisible)<7.3×10−5 and B(ϕ→invisible)<1.7×10−4, respectively.
A
bstract
Using data collected with the BESIII detector in
e
+
e
−
collisions at center-of-mass energies between 4.178 and 4.226 GeV and corresponding to 6.32 fb
−
1
of integrated luminosity, we ...report the amplitude analysis and branching-fraction measurement of the
D
s
+
→ π
+
π
0
η
′ decay. We find that the dominant intermediate process is
D
s
+
→ ρ
+
η
′ and the significances of other resonant and nonresonant processes are all less than 3
σ
. The upper limits on the branching fractions of
S
-wave and
P
-wave nonresonant components are set to 0.10% and 0.74% at the 90% confidence level, respectively. In addition, the branching fraction of the
D
s
+
→ π
+
π
0
η
′ decay is measured to be (6
.
15
±
0
.
25(stat
.
)
±
0
.
18(syst
.
))%, which receives significant contribution only from
D
s
+
→ ρ
+
η
′ according to the amplitude analysis.
The four decay modes D0→ϕπ0, D0→ϕη, D+→ϕπ+, and D+→ϕK+ are studied by using a data sample taken at the centre-of-mass energy s=3.773 GeV with the BESIII detector, corresponding to an integrated ...luminosity of 2.93 fb−1. The branching fractions of the first three decay modes are measured to be B(D0→ϕπ0)=(1.168±0.028±0.028)×10−3, B(D0→ϕη)=(1.81±0.46±0.06)×10−4, and B(D+→ϕπ+)=(5.70±0.05±0.13)×10−3, respectively, where the first uncertainties are statistical and the second are systematic. In addition, the upper limit of the branching fraction for D+→ϕK+ is given to be 2.1×10−5 at the 90% confidence level. The ratio of B(D0→ϕπ0) to B(D+→ϕπ+) is calculated to be (20.49±0.50±0.45)%, which is consistent with the theoretical prediction based on isospin symmetry between these two decay modes.
Search for the decay $h_c$ → $π^0J/ψ Bai, X. H.; Bai, Y.; Bakina, O. ...
The journal of high energy physics,
05/2022, Letnik:
2022, Številka:
5
Journal Article
Recenzirano
Odprti dostop
A search for the decay $h_c$ → $π^0J/ψ$ is performed using a sample of hc produced in the reaction $e^+e^-$ → $π^+π^-h_c$. The data samples were collected with the BESIII detector at center-of-mass ...energies between 4.189 and 4.437 GeV, corresponding to a total integrated luminosity of 11 fb-1. No significant signal is observed. Upper limits on the branching ratio $\mathcal{B}$($h_c$ →$π^oJ/ψ$)/$\mathcal{B}$($h_c$ →$γη_c$ →$γK^+K_-π^o$) and on the branching fraction $\mathcal{B}$($h_c$ →$π^oJ/ψ$) are determined to be 7.5 x 10-2 and 4.7 x 10-4 at 90% confidence level, respectively. The latter is derived from the former using the measured branching fraction of the normalization channel. This is the first determination of the upper limit of the decay $h_c$ → $π^0J/ψ$
PDF
