Identification of Y（4008）, Y（4140）, Y（4260）, and Y（4360） as Tetraquark States

Within the framework of a color flux-tube model with a four-body confinement potential, the tetraquark states [cq][Oc]] （q =u or d） with IJPc = 01-- are systematically investigated. The numerical results indicate that states Y（4008）, Y（4140）, Y（4260）, and Y（4360） can be uniformly described as tetraquark states [cq][0c]] with n2S＋1La of 11P1, 15P1, 25P1 and 15F1, respectively, in the color flux-tube model. They are compact three- dimensional spatial configurations similar to a rugby ball, higher orbital angular momentum L, more prolate. The four-body confinement interaction based on a color flux-tube picture should be responsible for the formation of those compact tetraquark states.