CHARMED, STRANGE MESONS
($\boldsymbol C$ = $\boldsymbol S$ = $\pm1$)
(including possibly non- ${\boldsymbol {\boldsymbol q}}$ ${\boldsymbol {\overline{\boldsymbol q}}}$ states)
${{\mathit D}_{{s}}^{+}}$ = ${\mathit {\mathit c}}$ ${\mathit {\overline{\mathit s}}}$, ${{\mathit D}_{{s}}^{-}}$ = ${\mathit {\overline{\mathit c}}}$ ${\mathit {\mathit s}}$, similarly for ${{\mathit D}_{{s}}^{*}}$'s
INSPIRE search

${{\boldsymbol X}_{{1}}{(2900)}}$ $I(J^P)$ = $?(1^{-})$ 

An exotic state with minimal quark content ${{\overline{\mathit c}}}{{\mathit d}}{{\overline{\mathit s}}}{{\mathit u}}$ . Observed by AAIJ 2020AI using full amplitude analysis of ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit D}^{+}}{{\mathit D}^{-}}{{\mathit K}^{+}}$ decays.
${{\mathit X}_{{1}}{(2900)}}$ MASS   $2904 \pm5$ MeV 
${{\mathit X}_{{1}}{(2900)}}$ WIDTH   $110 \pm12$ MeV 
$\Gamma_{1}$ ${{\mathit D}^{-}}{{\mathit K}^{+}}$  seen 743