Xiao-Shuai Qin | Searcharxiv

arXiv2021

A fast simulation package for STCF detector

A Super Tau Charm Facility (STCF) is one of the major options for the accelerator-based high energy project in China in the post-BEPCII era, and its R\&D program is underway. The proposed STCF will span center of mass energies ($\sqrt{s}$) ranging from 2 to 7 GeV with a peaking luminosity above $0.5\times 10^{35}$ cm$^{-2}$s$^{-1}$ at $\sqrt{s}=4.0$ GeV, and will provide a unique platform for tau-charm physics and hadron physics. In order to evaluate the physical potential capabilities and optimize the detector design, a fast simulation package has been developed. This package takes as inputs the response of physical objects in each sub-system of the detector including resolution, efficiency as well as related variables for the kinematic fit and the secondary vertex reconstruction algorithm. It can flexibly adjust the responses of each sub-detector system and is a critical tool for the STCF R\&D program.

physics.ins-det↗

arXiv2010

Study of the branching ratio of $ψ(3770)\to D\bar{D}$ in $e^+e^-\to D\bar{D}$ scattering

Based on the data of BES and Belle, the production of $D\bar{D}$ in the $e^+e^-\to D\bar{D}$ scattering process is studied in this paper. We analyze the continuum and resonant contributions in the energy region from 3.7 to 4.4 GeV. In the $χ^2$ fit to data, we obtain the resonance parameters of $ψ(3770)$, the branching ratio of $ψ(3770)\to D\bar{D}$ decay by confronting the data to the theoretical formula where both the contributions of the resonances, continuum and interference effects are included. We obtain the branching ratio of $ψ(3770)\to D\bar{D}$ decay is $97.2%\pm 8.9%$, as well as the branching ratio of $ψ(4040)$, $ψ(4160)\to D\bar{D}$ decays.

hep-ph↗