A5058187832- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- Various Chemistry Research Topics
- Advanced Chemical Sensor Technologies
- High-Energy Particle Collisions Research
- Microfluidic and Capillary Electrophoresis Applications
Nanjing Normal University
2023
Central China Normal University
2020
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$.
This work presents a homemade multirole 3D-printed modular spectrometer (MPMS), which can be easily assembled like bricks and expanded with several modules to measure different types of spectra, such as UV–vis absorption, fluorescence emission, flame emission/absorption, glow discharge, even Raman spectra. The is designed cheap, flexible, its inner structure displayable, making it suitable for range applications age groups. assembly process allows clear understanding the basic monochromator,...