Lattice study of two-photon decay widths for scalar and pseudo-scalar charmonium  

作　　者：Ying Chen Ming Gong Ning Li Chuan Liu Yu-Bin Liu Zhaofeng Liu Jian-Ping Ma Yu Meng Chao Xiong Ke-Long Zhang 无 陈莹;宫明;荔宁;刘川;刘玉斌;刘朝峰;马建平;孟雨;熊超;张克龙;无(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;School of Physics,University of Chinese Academy of Sciences,Beijing 100049,China;School of Science,Xi’an Technological University,Xi’an 710032,China;School of Physics and Center for High Energy Physics,Peking University,Beijing 100871,China;Collaborative Innovation Center of Quantum Matter,Beijing 100871,China;School of Physics,Nankai University,Tianjin 300071,China;Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physics,Peking University,Beijing 100871,China;CLQCD Collaboration)

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]School of Physics,University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Science,Xi’an Technological University,Xi’an 710032,China [4]School of Physics and Center for High Energy Physics,Peking University,Beijing 100871,China [5]Collaborative Innovation Center of Quantum Matter,Beijing 100871,China [6]School of Physics,Nankai University,Tianjin 300071,China [7]Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [8]School of Physics,Peking University,Beijing 100871,China [9]CLQCD Collaboration

出　　处：《Chinese Physics C》2020年第8期88-97,共10页中国物理C（英文版）

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;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)。

摘　　要：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.

关 键 词：CHARMONIUM decay width lattice QCD 

分 类 号：O413.1[理学—理论物理]