Using a sample of 1.31×109 J/ψ events collected with the BESIII detector, we perform a search for the rare decay η′→4π0 via J/ψ→γη′. No significant η′ signal is observed in the 4π0 invariant mass ...spectrum. With a Bayesian approach, the upper limit on the branching fraction is determined to be B(η′→4π0)<4.94×10−5 at the 90% confidence level, which is a factor of 6 smaller than the previous experimental limit.
Perianal fistulas, characterised as granulomatous inflammation of fistulas around the anal canal, are associated with significant morbidity resulting in a negative impact on quality of life and a ...tremendous burden to the healthcare system. Treatment of anal fistulas usually consists of anal surgery; however, results of closure rates are not satisfactory especially with complex perianal fistulas, after which many patients may suffer from anal incontinence. Recently, the administration of mesenchymal stem cells (MSCs) has shown promising efficacy. Herein, we aim to explore whether MSCs are effective for complex perianal fistulas and if they have either short-term, medium-term, long-term or over-long-term efficacy. Additionally, we want to elucidate whether factors such as drug dosage, MSC source, cell type, and disease aetiology influence treatment efficacy. We searched four online databases and analysed data based on information within the clinical trials registry. The outcomes of eligible trials were analysed with Review Manager 5.4.1. Relative risk and related 95% confidence interval were calculated to compare the effect between the MSCs and control groups. In addition, the Cochrane risk of bias tool was applied to evaluate the bias risk of eligible studies. Meta-analyses showed that therapy with MSCs was superior to conventional treatment for complex perianal fistulas in short-, long- and over-long-term follow-up phases. However, there was no statistical difference in treatment efficacy in the medium term between the two methods. Subgroup meta-analyses showed factors including cell type, cell source and cell dosage were superior compared to the control, but there was no significant difference between different experimental groups of those factors. Besides, local MSCs therapy has shown more promising results for fistulas as a result of Crohn's Disease (CD). Although we tend to maintain that MSCs therapy is effective for cryptoglandular fistulas equally, more studies are needed to confirm this conclusion in the future.
MSCs Transplantation could be a new therapeutic method for complex perianal fistulas of both cryptoglandular and CD origin showing high efficacy in the short-term to over-long-term phases, as well as high efficacy in sustained healing. The difference in cell types, cell sources and cell dosages did not influence MSCs' efficacy.
A
bstract
With data samples collected with the BESIII detector at seven energy points at
$$ \sqrt{s} $$
s
= 3
.
68
−
3
.
71 GeV, corresponding to an integrated luminosity of 333 pb
−
1
, we present a ...study of the Λ transverse polarization in the
e
+
e
−
→
$$ \Lambda \overline{\Lambda} $$
Λ
Λ
¯
reaction. The significance of polarization by combining the seven energy points is found to be 2.6
σ
including the systematic uncertainty, which implies a non-zero phase between the transition amplitudes of the
$$ \Lambda \overline{\Lambda} $$
Λ
Λ
¯
helicity states. The modulus ratio and the relative phase of EM-
psionic
form factors combined with all energy points are measured to be
R
Ψ
=
$$ {0.71}_{-0.10}^{+0.10} $$
0.71
−
0.10
+
0.10
±
0.03 and ∆Φ
Ψ
=
$$ {23}_{-8.0}^{+8.8} $$
23
−
8.0
+
8.8
±
1.6
°
, where the first uncertainties are statistical and the second systematic.
A search for the rare radiative leptonic decay Ds+→γe+νe is performed for the first time using electron-positron collision data corresponding to an integrated luminosity of 3.19 fb−1, collected with ...the BESIII detector at a center-of-mass energy of 4.178 GeV. No evidence for the Ds+→γe+νe decay is seen, and an upper limit of B(Ds+→γe+νe)<1.3×10−4 is set on the partial branching fraction at a 90% confidence level for radiative photon energies Eγ*>0.01 GeV.
We examine the electromagnetic Dalitz decay J/ψ → e+e-η and search for di-electron decays of a dark gauge boson (γ') in J/ψ → γ'η with the two η decay modes η → γγ and η → $\pi$+$\pi$-$\pi$0 using ...(1310.6 ± 7.0) × 106 J/ψ events collected with the BESIII detector. The branching fraction of J/ψ → e+e-η is measured to be (1.43 ± 0.04(stat) ± 0.06(syst)) × 10-5, with a precision that is improved by a factor of 1.5 over the previous BESIII measurement. The corresponding dielectron invariant mass dependent modulus square of the transition form factor is explored for the first time, and the pole mass is determined to be Λ = 2.84 ± 0.11(stat) ± 0.08(syst) GeV/c2. We find no evidence of γ' production and set 90% confidence level upper limits on the product branching fraction $\mathcal{B(J/ψ → γ'η)× B(γ' → e^+e^-)}$ as well as the kinetic mixing strength between the Standard Model photon and γ' in the mass range of 0.01 ≤ mγ' ≤ 2.4 GeV/c2.
Using e+e- annihilation data corresponding to an integrated luminosity of 2.93 fb-1 taken at a center-of -mass energy of 3.773 GeV with the BESIII detector, we report the first measurements of the ...branching fractions of the inclusive decays D0 -> pi+pi+pi-X and D+ -> pi+ pi+ pi-X, where pions from K0S decays have been excluded from the pi+pi+pi- system and X denotes any possible particle combination. The branching fractions of D0(D+) -> pi+pi+pi-X are determined to be B(D0 -> pi+pi+pi-X) = (17.60 +/- 0.11 +/- 0.22)% and B(D+ ->pi+pi+pi-X) = (15.25 +/- 0.09 +/- 0.18)%, where the first uncertainties are statistical and the second systematic.
The hadronic interaction of cosmic rays with solar atmosphere can produce high energy gamma-rays. The gamma-ray luminosity is correlated both with the flux of primary cosmic rays and the intensity of ...the solar magnetic field. The gamma-rays below 200 GeV have been observed by Fermi without any evident energy cutoff. The bright gamma-ray flux above 100 GeV has been detected only during solar minimum. The only available data in the TeV range come from the HAWC observations, however, outside the solar minimum. The ARGO-YBJ data set has been used to search for sub-TeV/TeV gamma-rays from the Sun during the solar minimum from 2008 to 2010, the same time period covered by the Fermi data. A suitable model containing the Sun shadow, solar disk emission, and inverse-Compton emission has been developed, and the chi-square minimization method was used to quantitatively estimate the disk gamma-ray signal. The result shows that no significant gamma-ray signal is detected and upper limits to the gamma-ray flux at 0.3-7 TeV are set at the 95% confidence level. In the low energy range these limits are consistent with the extrapolation of the Fermi-LAT measurements taken during solar minimum and are compatible with a softening of the gamma-ray spectrum below 1 TeV. They also provide an experimental upper bound to any solar disk emission at TeV energies. Models of dark matter annihilation via long-lived mediators predicting gamma-ray fluxes >10−7 GeV cm−2 s−1 below 1 TeV are ruled out by the ARGO-YBJ limits.
By analyzing 2.93 fb−1 of e+e− annihilation data taken at the center-of-mass energy √s = 3.773 GeV with the BESIII detector, we determine the branching fractions of the inclusive decays D+ → ϕX and ...D0 → ϕX to be (1.135±0.034±0.031)% and (1.091±0.027±0.035)%, respectively, where X denotes any possible particle combination. The first uncertainties are statistical, and the second are systematic. We also determine the branching fractions of the decays D → ϕX and their charge conjugate modes D¯ → ϕX¯ separately for the first time, and no significant CP asymmetry is observed.
Aims
To produce fibreboard with Triarrhena sacchariflora residue (TSR) without adhesive and understand the relationship between bio‐pretreatment and mechanical property of fibreboard.
Methods and ...Results
White‐rot fungus Coriolus versicolor was used to pretreat TSR, and biochemical and physical analysis were investigated by ultraviolet spectrophotometry, Fourier transform infrared spectroscopy and environmental scanning electron microscopy method.
Conclusions
TSR was suitable to produce fibreboard without adhesive by bio‐pretreatment with C. versicolor. The property of fibreboard became stronger by optimization of bio‐pretreatment parameters, and the moduli of rupture and elasticity of fibreboard were increased to 18·12 MPa and 4·3 GPa, respectively, which were close to national standard of medium‐density fibreboard with adhesive. Bio‐pretreated TSR increased the mechanical properties of fibreboard because of 1·4‐fold content of polysaccharide and 1·15 U g−1 laccase, more hydroxyl group and more porous surface structure than that of untreated TSR.
Significance and Impact of the Study
TSR‐based fibreboard production without adhesive eliminated potential formaldehyde gas emission.
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