CHARMED, STRANGE MESONS($\mathit C$ = $\mathit S$ = $\pm1$)(including possibly non- ${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ 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

#### ${{\boldsymbol X}_{{0}}{(2900)}}$

$I(J^P)$ = $?(0^{+})$
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.
 ${{\mathit X}_{{0}}{(2900)}}$ MASS $2866 \pm7$ MeV
 ${{\mathit X}_{{0}}{(2900)}}$ WIDTH $57 \pm13$ MeV
 $\Gamma_{1}$ ${{\mathit D}^{-}}{{\mathit K}^{+}}$ seen 711
 FOOTNOTES