Lattice calculation ofχ_(c0)→2γdecay width  

作　　者：Zuoheng Zou Yu Meng Chuan Liu 邹作恒;孟雨;刘川(School of Physics,Peking University,Beijing 100871,China;Center for High Energy Physics,Peking University,Beijing 100871,China;Collaborative Innovation Center of Quantum Matter,Beijing 100871,China)

机构地区：[1]School of Physics,Peking University,Beijing 100871,China [2]Center for High Energy Physics,Peking University,Beijing 100871,China [3]Collaborative Innovation Center of Quantum Matter,Beijing 100871,China

出　　处：《Chinese Physics C》2022年第5期20-28,共9页中国物理C（英文版）

基　　金：Support by NSFC of China (12070131001);support by CAS Interdisciplinary Innovation Team and NSFC of China (11935017);NSFC of China(12047505);State Key Laboratory of Nuclear Physics and Technology,Peking University

摘　　要：We perform a lattice QCD calculation of theχ_(c0)→2γdecay width using a model-independent method that does not require the momentum extrapolation of corresponding off-shell form factors.The simulation is performed on ensembles of N_(f)=2 twisted mass lattice QCD gauge configurations with three different lattice spacings.After the continuum extrapolation,the decay width is obtained to beΓ_(γγ)(χ_(c0))=3.65(83)_(stat)(21)_(lat.syst)(66)_(syst)keV.Regardless of this large statistical error,our result is compatible with the experimental results within 1.3σ.Potential improvements of the lattice calculation in the future are also discussed.

关 键 词：CHARMONIUM decay width lattice QCD 

分 类 号：O572.243[理学—粒子物理与原子核物理]