Composite nature of the $T_{cc}$ state

Xian-Wei Kang, Wen-Shuo Ding

In 2021, LHCb collaboration reported a very narrow state in the $D^0{D}^0{\pi }^{+}$ mass spectrum just below the $D^{\ast +}{D}^0$ mass threshold. We consider the influence of the Castillejo-Dal…