Molecular picture for the X₀(2866) as a D^* bar{K}^* J^P=0^+ state and related 1^+,2^+ states
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We recall the predictions made ten years ago about a bound state of $J^P=0^+$ in $I=0 $ of the $D^* \bar{K}^*$ system, which is manifestly exotic, and we associate it to the $X_0(2866)$ state reported in the recent LHCb experiment. Fine tuning the parameters to reproduce exactly the mass and width of the $X_0(2866)$ state, we report two more states stemming from the same interaction, one with $1^+$ and the other with $2^+$. For reasons of parity, the $1^+$ state cannot be observed in $D\bar{K}$ decay, and we suggest to observe it in the $D^*\bar{K}$ spectrum. On the other hand, the $2^+$ state can be observed in $D \bar{K}$ decay but the present experiment has too small statistics in the region of its mass to make any claim. We note that measurements of the $D^*\bar{K}$ spectrum and of the $D \bar{K}$ with more statistics should bring important information concerning the nature of the $X_0(2866)$ and related ones that could be observed.
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$T^a_{c\bar{s}0}(2900)$, $T_{cs0}^*(2870)^0$, and other singly-heavy tetraquark states
A mass splitting model anchored to X(4140) interprets LHCb's T^a_c sbar0(2900) and T_cs0*(2870)^0 as particular singly-heavy tetraquarks and forecasts several narrow states.
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