Ground-state studies of charmonium via radiative transitions at BESIII

FAIRNESS 2016

Haddadi, Zahra^1

KVI-CART, University of Groningen, Zernikelaan 25, Groningen

9747 AA, Netherlands^1

关键词: Beijing , China;    Potential Model;    Radiative transitions;    Relative velocity;    Relativistic correction;    Spin singlets;    Spin-singlet state;    Strong interaction;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/742/1/012013/pdf
DOI  :  10.1088/1742-6596/742/1/012013

来源: IOP

【 摘 要 】

Charmonium states consist of a heavy charm-anticharm quark pair (c ), bound by the strong interaction. Theoretically, charmonium can be analyzed based on a non-relativistic framework, since the motion of the charm quark inside the bound state is v2∼ 0.3, where v is relative velocity between the c and with the additional of relativistic corrections. All the narrow charmonium states below the open-charm threshold have been experimentally identified and their mass spectrum can be reasonably well described by potential models that incorporate a color Coulomb term at short distances and a linear scalar confining term at large distances. Although all charmonium states below the D mass threshold have been observed, knowledge is sparse on spin-singlet S-waves, ηc(1S) and ηc(2S). The BESIII/BEPCII facility in Beijing, China, has shed light on these spin-singlet states by collecting a new record of ψ(3686) decays in electron-positron annihilations.