摘要
We study the hybrid mesons with the exotic quantum number I^(G)J^(PG)=0+1-+and investigate their decays into theηη’,a1(1260)π,f1(1285)η,f1(1420)η,K*(892)■,K1(1270)■,and K1(1400)■channels.It is found that the QCD axial anomaly enhances the decay width of theηη’channel although this mode is strongly suppressed by the small p-wave phase space.Our results support the interpretation of theη1(1855)recently observed by BESⅢas the ssg hybrid meson of I^(G)J^(PC)=0^(+)1^(-+).The QCD axial anomaly ensures theηη’decay mode to be a characteristic signal of the hybrid nature of theη1(1855).
作者
Hua-Xing Chen
Niu Su
Shi-Lin Zhu
陈华星;苏妞;朱世琳(School of Physics,Southeast University,Nanjing 210094,China;School of Physics and Center of High Energy Physics,Peking University,Beijing 100871,China)
基金
supported by the National Natural Science Foundation of China(Grant Nos.12075019,11975033,and 12070131001)
the Jiangsu Provincial Double-Innovation Program(Grant No.JSSCRC2021488)
the Fundamental Research Funds for the Central Universities。
