We report an amplitude analysis and branching fraction measurement of D+s → K+K−π+ decay using a data sample of 3.19 fb−1 recorded with BESIII detector at a center-of-mass energy of 4.178 GeV. We ...perform a model-independent partial wave analysis in the low K+K− mass region to determine the K+K− S-wave line shape, followed by an amplitude analysis of our very pure high-statistics sample. With the detection efficiency based on the amplitude analysis results, the absolute branching fraction is measured to be B(D+s → K+K− π+) = (5.47 ± 0.0 8stat ± 0.13sys)%.
We present the first amplitude analysis of the decay Ds+→π+π0η. We use an e+e− collision data sample 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. We observe for the first time the W-annihilation dominant decays Ds+→a0(980)+π0 and Ds+→a0(980)0π+. We measure the absolute branching fraction B(Ds+→a0(980)+(0)π0(+),a0(980)+(0)→π+(0)η)=(1.46±0.15stat±0.23sys)%, which is larger than the branching fractions of other measured pure W-annihilation decays by at least one order of magnitude. In addition, we measure the branching fraction of Ds+→π+π0η with significantly improved precision.
From 1310.6 x 10(6) J/psi and 448.1 x 10(6) psi (3686) events collected with the BESIII experiment, we report the first observation of Sigma(+) and (Sigma) over bar (-) spin polarization in e(+)e(-) ...-> J/psipsi(3686) -> Sigma(+)(Sigma) over bar (-) decays. The relative phases of the form factors Delta Phi have been measured to be (-15.5 +/- 0.7 +/- 0.5)degrees and (21.7 +/- 4.0 +/- 0.8)degrees with J/psi and psi(3686) data, respectively. The nonzero value of Delta Phi allows for a direct and simultaneous measurement of the decay asymmetry parameters of Sigma(+)-> p pi(0) (alpha(0) = -0.998 +/- 0.037 +/- 0.009) and (Sigma) over bar (-)-> (p) over bar pi(0) ((alpha) over bar (0) = 0.990 +/- 0.037 +/- 0.011), the latter value being determined for the first time. The average decay asymmetry, (alpha(0 )- (alpha) over bar (0))/2, is calculated to be -0.994 +/- 0.004 +/- 0.002. The CP asymmetry A(CP,Sigma) = (alpha(0) + (alpha) over bar (0))/(alpha(0) - (alpha) over bar (0)) = -0.004 +/- 0.037 +/- 0.010 is extracted for the first time, and is found to be consistent with CP conservation.
Using an e+e− annihilation data sample corresponding to an integrated luminosity of 2.93 fb−1 collected at the center-of-mass energy of 3.773 GeV with the BESIII detector, we measure the absolute ...branching fractions of D+ → ηηπ+, D+ → ηπ+π0, and D0 → ηπ+π− to be (2.96 ± 0.24 ± 0.10) × 10−3, (2.23 ± 0.15 ± 0.10) × 10−3, and (1.20 ± 0.07 ± 0.04) × 10−3, respectively, where the first uncertainties are statistical and the second ones are systematic. The D+ → ηηπ+ decay is observed for the first time, and the branching fractions of D+(0) → ηπ+π0 (−) are measured with much improved precision. In addition we test for CP asymmetries in the separated charge-conjugate branching fractions; no evidence of CP violation is found.
The process e+e− → ϕη' has been studied for the first time in detail using data sample collected with the BESIII detector at the BEPCII collider at center of mass energies from 2.05 to 3.08 GeV. A ...resonance with quantum numbers JPC = 1−− is observed with mass M = ( 2177.5 ± 4.8 ( stat ) ± 19.5 ( syst ) ) MeV / c2 and width Γ = ( 149.0 ± 15.6 ( stat ) ± 8.9 ( syst ) ) MeV with a statistical significance larger than 10 σ , including systematic uncertainties. If the observed structure is identified with the ϕ ( 2170 ) , then the ratio of partial width between the ϕ η ′ by BESIII and ϕ η by BABAR is (...) = 0.23 ± 0.10 ( stat ) ± 0.18 ( syst ) , which is smaller than the prediction of the s ¯ s g hybrid models by several orders of magnitude. (ProQuest: ... denotes formula omited.).
The aim of this study was to determine whether Saccharomyces boulardii prevents and treats diarrhoea and antibiotic-associated diarrhoea (AAD) in children. A total of 333 hospitalised children with ...acute lower respiratory tract infection were enrolled in a 2-phase open randomised controlled trial. During the 1st phase, all children received intravenous antibiotics (AB). They were randomly allocated to group A (S. boulardii 500 mg/day + AB, n=167) or group B (AB alone, n=166) and followed for 2 weeks. Diarrhoea was defined as ≥3 loose/watery stools/day during at least 2 days, occurring during treatment and/or up to 2 weeks after AB therapy had stopped. AAD was considered when diarrhoea was caused by Clostridium difficile or when stool cultures remained negative. In the 2nd phase of the study, group B patients who developed diarrhoea were randomly allocated to two sub-groups: group B1 (S. boulardii + oral rehydration solution (ORS)) and group B2 (ORS alone). Data from 283 patients were available for analysis. Diarrhoea prevalence was lower in group A than in group B (11/139 (7.9%) vs. 42/144 (29.2%); relative risk (RR): 0.27, 95% confidence interval (CI): 0.1-0.5). S. boulardii reduced the risk of AAD (6/139 (4.3%) vs. 28/144 (19.4%); RR: 0.22; 95% CI: 0.1-0.5). When group B patients developed diarrhoea (n=42), S. boulardii treatment during 5 days (group B1) resulted in lower stool frequency (P<0.05) and higher recovery rate (91.3% in group B1 vs. 21.1% in B2; P<0.001). The mean duration of diarrhoea in group B1 was shorter (2.31±0.95 vs. 8.97±1.07 days; P<0.001). No adverse effects related to S. boulardii were observed. S. boulardii appeared to be effective in the prevention and treatment of diarrhoea and AAD in children treated with intravenous antibiotics.
Background
Vitamin D is important for maintaining physiological functions including cognition and its deficiency is associated with the occurrence of cognitive impairment. This study was to explore ...the association between preoperative vitamin D status and the occurrence of postoperative cognitive dysfunction (POCD) in elderly patients undergoing major surgery.
Methods
This was a predefined exploratory sub‐analysis of one‐centre data from a randomized controlled trial. In all, 123 elderly (≥ 65 years) patients who were scheduled to undergo major cancer surgery were recruited. Serum 25‐hydroxyvitamin D concentration was measured before surgery. In total, 59 nonsurgical control subjects with comparable age and education level were also enrolled. A battery of neuropsychological tests was administered the day before and the 7th day after surgery in patients or at the same time interval in control subjects. POCD was diagnosed according to the ISPOCD1 definition.Results71.5% (88/123) of elderly patients had vitamin D deficiency (serum 25‐hydroxyvitamin D concentration < 12 ng/ml) before surgery; 24.4% (30/123) of them developed cognitive dysfunction at 1 week after surgery. After adjusting for confounding factors, high preoperative serum 25‐hydroxyvitamine D concentration was related to a decreased risk of POCD (odds ratio OR: 0.829, 95% confidence interval CI: 0.708–0.971; P = 0.020), whereas preoperative vitamin D deficiency was associated with an increased risk of POCD (OR: 8.427, 95% CI: 1.595–44.511; P = 0.012).ConclusionsVitamin D deficiency is prevalent in elderly patients undergoing major cancer surgery and increases the risk of early POCD development. Whether prophylactic vitamin D supplementation can reduce POCD in the elderly deserves further study.
Using 2.93 fb −1 of e+e− annihilation data collected at a center-of-mass energy √s = 3.773 GeV with the BESIII detector operating at the BEPCII collider, we search for the semileptonic D0(+) decays ...into a b1(1235) − (0) axial-vector meson for the first time. No significant signal is observed for either charge combination. The upper limits on the product branching fractions are BD0 → b1(1235)−e+νe Bb1(1235)− → ωπ−< 1.12 × 10−4 and BD+ → b1(1235)0e+νe⋅ Bb1(1235)0 → ωπ0< 1.75 × 10−4 at the 90% confidence level.
The cross section of the process e+e− → ωχc0 is measured at center-of-mass energies from √s=4.178 to 4.278 GeV using a data sample of 7 fb−1 collected with the BESIII detector operating at the BEPCII ...storage ring. The dependence of the cross section on s shows a resonant structure with mass of (4218.5±1.6(stat)±4.0(syst)) MeV/c2 and width of (28.2±3.9(stat)±1.6(syst)) MeV, respectively. This observation confirms and improves upon the result of a previous study. The angular distribution of the e+e− → ωχc0 process is extracted for the first time.
We study the decays Λc+→Ληπ+ and Σ(1385)+η based on Λc+Λ¯c− pairs produced in e+e− collisions at a center-of-mass energy of s=4.6 GeV, corresponding to an integrated luminosity of 567 pb−1. The data ...sample was accumulated with the BESIII detector at the BEPCII collider. The branching fractions are measured to be B(Λc+→Ληπ+)=(1.84±0.21(stat)±0.15(syst))% and B(Λc+→Σ(1385)+η)=(0.91±0.18(stat)±0.09(syst))%, constituting the most precise measurements to date.
PDF
