Based on a data sample of (2712.4±14.3)×10 6 ψ(3686) events collected with the BESIII detector at the BEPCII collider, the M1 transition ψ(3686)→γη c (2S) with η c( 2S)→K¯Kπ is studied, where K¯Kπ is ...K + K − π 0 or K 0 S K ± π ∓ . The mass and width of the η c (2S) are measured to be (3637.8±0.8(stat)±0.2(syst)) MeV/c 2 and (10.5±1.7(stat)±3.5(syst)) MeV, respectively. The product branching fraction B(ψ(3686)→γη c (2S))×B(η c (2S)→K¯Kπ) is determined to be (0.97±0.06(stat)±0.09(syst))×10 −5 . Using B(η c (2S)→K¯Kπ)=(1.86 +0.68 −0.49 )%, we obtain the branching fraction of the radiative transition to be B(ψ(3686)→γη c (2S))=(5.2±0.3(stat)±0.5(syst) +1.9 −1.4 (extr))×10 −4 , where the third uncertainty is due to the quoted B(η c (2S)→K¯Kπ).
The effectiveness and cost-benefit of Open-Graded Friction Course (OGFC) pavements were analysed in this study by investigating the cost, field performance, short- and long-term effectiveness, and ...accident rate of OGFC projects in Tennessee. Paired sample t-tests were conducted to compare if there was significant difference between OGFC and non-OGFC sections. Investigation on the performance effectiveness showed that OGFC sections provided comparable performance level as traditional dense mix overlays and were effective in improving pavement performance and repairing deterioration except for rutting potential. However, no severe pavement deterioration was observed on the OGFC sections after more than four or five years of service, indicating sufficient durability of the OGFC used in Tennessee where mild freeze-thaw cycles are experienced annually. Although the unit cost ($/m
3
) of OGFC was about 42% higher than the cost of traditional dense mix overlays, it was observed that the accident rate was significantly reduced especially in rainy days after the OGFC treatment. The cost-benefit analyses based on the ratio of accident rate reduction over cost demonstrated that OGFC was significantly more cost-beneficial in improving driving safety and reducing accident rate in rainy days.
The Born cross sections for the process e+e− → η′π+π− at different center-of-mass energies between 2.00 and 3.08 GeV are reported with improved precision from an analysis of data samples collected ...with the BESIII detector operating at the BEPCII storage ring. An obvious structure is observed in the Born cross section line shape. Fit as a Breit-Wigner resonance, it has a statistical significance of 6.3 σ and a mass and width of M = ( 2111 ± 43 ± 25 ) MeV / c2 and Γ = ( 135 ± 34 ± 30 ) MeV , where the uncertainties are statistical and systematic, respectively. These measured resonance parameters agree with the measurements of BABAR in e+e− → η′ π+π− and BESIII in e+e− → ωπ0 within two standard deviations.
The processes $e^+e^– → D^+_sD_{s1}(2460)^– + \text{c.c.}$ and $e^+e^– → D^{\ast+}_sD_{s1}(2460)^– + \text{c.c.}$ are studied for the first time using data samples collected with the BESIII detector ...at the BEPCII collider. The Born cross sections of $e^+e^– → D^+_sD_{s1}(2460)^– + \text{c.c.}$ at nine center-of-mass energies between 4.467 GeV and 4.600 GeV and those of $e^+e^– → D^{\ast+}_sD_{s1}(2460)^– + \text{c.c.}$ at $\sqrt{s}$ = 4.590 GeV and 4.600 GeV are measured. No obvious charmonium or charmoniumlike structure is seen in the measured cross sections.
Using a sample of 106 million $ψ(3686)$ decays, $ψ(3686)→γχ_{cJ}(J=0,1,2)$ and $ψ(3686)→γχ_{cJ},χ_{cJ}→γJ/ψ(J=1,2)$ events are utilized to study inclusive $χ_{cJ}→$ anything, $χ_{cJ}→$ hadrons, and ...$J/ψ→$ anything distributions, including distributions of the number of charged tracks, electromagnetic calorimeter showers, and $π^0s$, and to compare them with distributions obtained from the BESIII Monte Carlo simulation. Information from each Monte Carlo simulated decay event is used to construct matrices connecting the detected distributions to the input predetection “produced” distributions. Assuming these matrices also apply to data, they are used to predict the analogous produced distributions of the decay events. Using these, the charged particle multiplicities are compared with results from MARK I. Further, comparison of the distributions of the number of photons in data with those in Monte Carlo simulation indicates that G-parity conservation should be taken into consideration in the simulation.
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