A5102857312- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Advanced Algebra and Geometry
- Atmospheric Ozone and Climate
- Biosensors and Analytical Detection
- Vibration and Dynamic Analysis
- Synthesis and Characterization of Heterocyclic Compounds
- Traffic and Road Safety
- Safety Warnings and Signage
- Elevator Systems and Control
- Synthesis and Biological Evaluation
- Digital Platforms and Economics
- Coding theory and cryptography
- Algebraic and Geometric Analysis
- Digital Marketing and Social Media
- Underground infrastructure and sustainability
China Automotive Technology and Research Center
2024
Instituto Superior Técnico
2023
Campbell Collaboration
2023
Nanchang University
2023
Hunan University
2003-2020
Yale University
2005
We observe a narrow enhancement near 2m(p) in the invariant mass spectrum of pp pairs from radiative J/psi-->gammapp decays. No similar structure is seen J/psi-->pi(0)pp The results are based on an analysis 58 x 10(6) event sample J/psi decays accumulated with BESII detector at Beijing electron-positron collider. can be fit either S- or P-wave Breit-Wigner resonance function. In case S-wave fit, peak below M=1859(+3)(-10) (stat)+5-25(syst) MeV/c(2) and total width Gamma<30 90% confidence...
In a sample of 58 million $J/ψ$ events collected with the BES II detector, process J/$ψ\toγη_c$ is observed in five different decay channels: $γK^+K^-π^+π^-$, $γπ^+π^-π^+π^-$, $γK^\pm K^0_S π^\mp$ (with $K^0_S\toπ^+π^-$), $γϕϕ$ $ϕ\to K^+K^-$) and $γp\bar{p}$. From combined fit all channels, we determine mass full-width $η_c$ to be $m_{η_c}=2977.5\pm1.0 ({stat.})\pm1.2 ({syst.})$ MeV/$c^2$ $Γ_{η_c} = 17.0\pm3.7 ({stat.})\pm7.4 MeV/$c^2$.
In a sample of 58 million $J/ψ$ events collected with the BES II detector, process J/$ψ\toγη_c$ is observed in five decay channels: $η_c \to K^+K^-π^+π^-$, $π^+π^-π^+π^-$, $K^\pm K^0_S π^\mp$ (with $K^0_S\toπ^+π^-$), $ϕϕ$ $ϕ\to K^+K^-$) and $p\bar{p}$. From these signals, we determine $Br(J/ψ\toγη_c)\times Br(η_c\to K^+K^-π^+π^-)$ $=(1.5\pm0.2\pm0.2)\times10^{-4}$, π^+π^-π^+π^-)$ $=(1.3\pm0.2\pm0.4)\times10^{-4}$, K^\pm K_{S}^{0}π^\mp)$ $=(2.2\pm0.3\pm0.5)\times10^{-4}$, ϕϕ)$...
High‐rise building fires can be characterized by a rapid spreading and are challenging to extinguish. The chimney effect of cable shafts in high‐rise buildings will greatly increase the spread speed fire smoke, also make it harder put out fires. Therefore, fire‐blocking materials or protection measures usually used slow down even block fire. Currently, most research focuses on performance materials, there relatively few studies impact operation state cables. Based theories electromagnetism,...
In recent years, there have been an increasing number of traffic accidents resulting in fatalities and injuries due to collisions between the passengers or drivers opening car door objects coming from behind. The attention OEMs on warning (DOW) systems is insufficient, proportion vehicles equipped with DOW system not high. At present, are no national standards testing protocols published for China, a lack unified requirements functions system. Based analysis relevant accident data scenarios...