This exploratory study computes two-photon decay widths of pseudo-scalar(ηc)and scalar(χc0)charmonium using two ensembles of Nf=2 twisted mass lattice QCD gauge configurations.The simulation is performed using two l...This exploratory study computes two-photon decay widths of pseudo-scalar(ηc)and scalar(χc0)charmonium using two ensembles of Nf=2 twisted mass lattice QCD gauge configurations.The simulation is performed using two lattice ensembles with lattice spacings a=0.067 fm with size 323×64 and a=0.085 fm with size 243×48.The decay widths for the two charmonia are obtained within the expected ballpark,but are however smaller than the experimental ones.Possible reasons for these discrepancies are discussed.展开更多
基金supported in part by the National Science Foundation of China(NSFC)(11335001,11275169,11405178,11935017,11575196,11875169,11775229)It is also supported in part by the DFG and the NSFC(11261130311)through funds provided to the Sino-Germen CRC 110 symmetries and the Emergence of Structure in QCD+1 种基金This work is also funded in part by National Basic Research Program of China(973 Program)(2015CB856700).M.Gong and Z.Liu are partially supported by the Youth Innovation Promotion Association of CAS(2013013).This work is also supported by the Scientific Research Program Funded by Shaanxi Pro-vincial Education Department(19JK0391)Natural Science Basic Research Plan in Shaanxi Province of China(2019JM-001)。
文摘This exploratory study computes two-photon decay widths of pseudo-scalar(ηc)and scalar(χc0)charmonium using two ensembles of Nf=2 twisted mass lattice QCD gauge configurations.The simulation is performed using two lattice ensembles with lattice spacings a=0.067 fm with size 323×64 and a=0.085 fm with size 243×48.The decay widths for the two charmonia are obtained within the expected ballpark,but are however smaller than the experimental ones.Possible reasons for these discrepancies are discussed.
