分类: 物理学 >> 核物理学 提交时间: 2016-09-05
摘要: We investigate the Y(4260) production in e+e− annihilations and probe its structure as the D¯D1+c.c. hadronic molecule state. By introducing a compact cc¯ component into the wavefunction in addition to the long-ranged molecular one, we show that the compositeness relation can still provide a reasonable constraint on the wavefunction renormalization parameter. This study confirms the earlier work that the Y(4260) contains predominantly a D¯D1+c.c. molecular component, and its decays into the D¯D∗π+c.c. channel should have a nontrivial lineshape. It provides a natural explanation for the production of Y(4260) in e+e− annihilations in the same framework. It also allows us to predict the Y(4260) leptonic decay width of which the upper limit is about 500 eV.