Revisiting the determining fraction of glueball component in f_(0) mesons via radiative decays of J/ψ  

作　　者：Xing-Dao Guo Hong-Wei Ke Ming-Gang Zhao Liang Tang Xue-Qian Li 郭星导;柯红卫;赵明刚;汤亮;李学潜(College of Physics and New Energy,Xuzhou University of Technology,Xuzhou 221111,China;School of Science,Tianjin University,Tianjin 300072,China;Department of Physics,Nankai University,Tianjin 300071,China;College of Physics,Hebei Normal University,Shijiazhuang 050024,China)

机构地区：[1]College of Physics and New Energy,Xuzhou University of Technology,Xuzhou 221111,China [2]School of Science,Tianjin University,Tianjin 300072,China [3]Department of Physics,Nankai University,Tianjin 300071,China [4]College of Physics,Hebei Normal University,Shijiazhuang 050024,China

出　　处：《Chinese Physics C》2021年第2期133-143,共11页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11805160,11747040,11675082,11605039)。

摘　　要：QCD theory predicts the existence of glueballs,but so far all experimental endeavors have failed to identify any such states.To remedy this discrepancy between QCD,which has proven to be a successful theory for strong interactions,and the failure of experimental searches for glueballs,one is tempted to accept the promising interpretation that the glueballs mix with regular qq states of the same quantum numbers.The lattice estimate of the masses of pure 0++ glueballs ranges from 1 to 2 GeV,which is the region of the f_(0)family.Thus many authors suggest that the f_(0) mesonic series is an ideal place to study possible mixtures of glueballs and qq.In this paper,following the strategy proposed by Close,Farrar and Li,we try to determine the fraction of glueball components inf_(0)mesons using the measured mass spectra and the branching ratios of J/ψ radiative decays intof_(0)mesons.Since the pioneering papers by Close et al.,more than 20 years have elapsed and more accurate measurements have been done by several experimental collaborations,so it is time to revisit this interesting topic using new data.We suppose f_(0)(500)and f_(0)(980)to be pure quark states,while for f_(0)(1370),f_(0)(1500)and f_(0)(1710),to fit both the experimental data of J/ψradiative decay and their mass spectra,glueball components are needed.Moreover,the mass of the pure 0++ glueball is phenomenologically determined.

关 键 词：GLUEBALL f_(0) J/ψradiative decay 

分 类 号：O572.33[理学—粒子物理与原子核物理]