Form factor for Dalitz decays from J/ψ to light pseudoscalars  

作　　者：Chunjiang Shi Ying Chen Xiangyu Jiang Ming Gong Zhaofeng Liu Wei Sun 施春江;陈莹;蒋翔宇;宫明;刘朝峰;孙玮(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China;Center for High Energy Physics,Peking University,Beijing 100871,China)

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [4]Center for High Energy Physics,Peking University,Beijing 100871,China

出　　处：《Chinese Physics C》2024年第11期52-60,共9页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China (11935017,12293060,12293065,12293061,12293062,12293063,12075253,12192264,12175063,12205311,12070131001 (CRC 110 by DFG and NNSFC));the National Key Research and Development Program of China (2020YFA0406400);the Strategic Priority Research Program of Chinese Academy of Sciences (XDB34030302).

摘　　要：We calculate the form factor M(q^(2))for the Dalitz decay J/ψ→γ*(q^(2))η(N_(f)=1)with η(N_(f))being the SU(N_(f))flavor singlet pseudoscalar meson.The difference among the partial widths Г(J/ψ→γη(N_(f)))at different N_(f) can be attributed in part to the N_(f) and quark mass dependences induced by the U_(A)(1)anomaly dominance.M(q^(2))in both N_(f)=1,2 is well described by the single pole model M(q^(2))=M(0)/(1-q^(2)/Λ^(2)).Combined with the known experimental results of the Dalitz decays J/ψ-Pe^(+)e^(−),the pseudoscalar mass mp dependence of the pole parameter A is approximated byΛ(m^(2)_(p))=Λ_(1)(1-m^(2)_(p)/Λ_(2))withΛ_(1)=2.65(5)GeV andΛ_(2)=2.90(35)GeV.These results provide inputs for future theoretical and experimental studies on the Dalitz decays J/ψ→Pe^(+)e^(−).

关 键 词：Lattice QCD quantum chromodynamics form factors particle decays radiative decays 

分 类 号：O572.243[理学—粒子物理与原子核物理]