Y (4260) and Y (4360) as mixed hadrocharmonium
Y (4260) and Y (4360) as mixed hadrocharmonium
复制标题
DOI：
10.1142/s0217732314500606
复制
发表时间：
2013-09
影响因子：
1.4
通讯作者：
Xin Li;Mikhail B Voloshin
中科院分区：
文献类型：
--
作者：
Xin Li;Mikhail B Voloshin
最新的BESIII数据表明在Y（4260）和Y（4360）共振态下e+e- →hc π+ π-的过程速率很大，这意味着重夸克自旋对称性的实质破缺。我们认为这些共振的图片hadrocharmonium，即（相对）紧凑charmonium嵌入在一个轻夸克介子激发。我们认为Y（4260）和Y（4360）共振是一个混合物，混合接近最大值，两个状态的Hadrochamonium，一个包含一个自旋三重态$c \bar c$对，另一个包含一个自旋单重态夸克对。我们认为，这个模型是在一个合理的协议与现有的数据，并产生独特的和可验证的预测，在e+e-湮灭的末态J/π，π ′ππ和hc ππ，包括两个共振之间的干涉模式的生产率的能量依赖。
Recent BESIII data indicate a significant rate of the process e+e- →hc π+ π- at the Y(4260) and Y(4360) resonances, implying a substantial breaking of the heavy quark spin symmetry. We consider these resonances within the picture of hadrocharmonium, i.e. of (relatively) compact charmonium embedded in a light-quark mesonic excitation. We suggest that the resonances Y(4260) and Y(4360) are a mixture, with mixing close to maximal, of two states of hadrochamonium, one containing a spin-triplet $c \bar c$ pair and the other containing a spin-singlet heavy quark pair. We argue that this model is in a reasonable agreement with the available data and produces distinctive and verifiable predictions for the energy dependence of the production rate in e+e- annihilation of the final states J/ψππ, ψ′ππ and hc ππ, including the pattern of interference between the two resonances.