| 摘 要： | The number of exotic candidates that are beyond the conventional quark model has increased dramatically over recent decades.Some of these can be viewed as analogues of the deuteron.Similarly,the existence of the triton indicates that bound states formed by three hadrons could also exist.To illustrate this possibility,we study the DD~*K and■systems using the Born-Oppenheimer approximation.To leading order,only one-pion exchange potentials are considered.This means that the three constituents share one virtual pion.This is similar to the role of the delocalizedπbond for the formation of benzene in chemistry.After solving the Schr?dinger equation,we find two three-body DD~*K and■ bound states with masses 4317.92~-6.55(+6.13)Me V and11013.65-8.84+8.49Me V,respectively.The masses of their ■and■ analogues are 4317.92~-6.55(+6.13)Me V and11013.65-9.02+8.68Me V,respectively.From the experimental side,the ■bound state could be found by analyzing the current world data on the B→J/ψππKprocess,by focusing on the J/ψπK channel.
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