论文标题
QCD轴向异常增强了混合候选$η_1（1855）$的$ηη^\ prime $衰减
QCD axial anomaly enhances the $ηη^\prime$ decay of the hybrid candidate $η_1(1855)$
论文作者
论文摘要
我们研究了具有异国情调量子数$ i^gj^{pc} = 0^+1^{ - +} $的混合介子，并调查它们的衰减到$ηη^\ prime $，$ a_1（1260）π$，$ f_1（$ f_1（1285）η$，$ f_1（1420）$，$，$，$，$，$，$，892*（89） $ k_1（1270）\ bar k $和$ k_1（1400）\ bar k $ channels。我们发现QCD轴向异常增强了$ηη^\ prime $通道的衰减宽度，尽管该模式被小的$ p $ - 波相位空间强烈抑制。我们的结果支持Besiii最近观察到的$η_1（1855）$的解释为$ i^gj^{pc} = 0^+1^{ - +} $。 QCD轴向异常确保$ηη^\ prime $衰减模式是$η_1（1855）$的混合性质的特征信号。
We study the hybrid mesons with the exotic quantum number $I^GJ^{PC} = 0^+1^{-+}$ and investigate their decays into the $ηη^\prime$, $a_1(1260) π$, $f_1(1285) η$, $f_1(1420) η$, $K^*(892) \bar K$, $K_1(1270) \bar K$, and $K_1(1400) \bar K$ channels. We find that the QCD axial anomaly enhances the decay width of the $ηη^\prime$ channel although this mode is strongly suppressed by the small $P$-wave phase space. Our results support the interpretation of the $η_1(1855)$ recently observed by BESIII as the $\bar s s g$ hybrid meson of $I^GJ^{PC}=0^+1^{-+}$. The QCD axial anomaly ensures the $ηη^\prime$ decay mode to be a characteristic signal of the hybrid nature of the $η_1(1855)$.
