QCD Axial Anomaly Enhances the ηη'Decay of the Hybrid Candidate η1(1855)

• 作者: Hua-Xing Chen Niu Su Shi-Lin Zhu
• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2022,（5）
• 所属期刊栏目: THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
• 页码范围: 48-54
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/0256-307X/39/5/051201

摘要

We study the hybrid mesons with the exotic quantum number IGJPC=0+1-+and investigate their decays into the ηη',a1(1260)π,f1(1285)η,f1(1420)η,K*(892)(K),K1(1270)(K),and K1(1400)(K )channels.It is found that the QCD axial anomaly enhances the decay width of the ηη'channel although this mode is strongly suppressed by the small p-wave phase space.Our results support the interpretation of the η1(1855)recently observed by BESIII as the(s)sg hybrid meson of IG JPC=0+1-+.The QCD axial anomaly ensures the ηη'decay mode to be a characteristic signal of the hybrid nature of the η1(1855).