How to understand the

In this work, the S- and P-wave $$\bar{D}^*K^*$$ interactions are studied in a coupled-channel formalism to understand the recently observed $$X_0(2900)$$ and $$X_1(2900)$$ at LHCb. The experimental event distributions can be well described, and two states with $$I(J^P)=0(0^+)$$ and $$0(1^-)$$ are yielded in a unified framework. The masses of the $$0^+$$ and $$1^-$$ states are consistent with the experimental data, but the width of the $$0^+$$ state is larger than that of the $$1^-$$ one. The $$X_1(2900)$$ can be interpreted as the P-wave excitation of the ground-state $$X_0(2900)$$ in the hadronic molecular picture. The S- and P-wave multiplets in the $$\bar{D}^*K^*$$ system have many members, so the present peak in the $$D^-K^+$$ invariant mass distributions might contain multi substructures