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CHARMED, STRANGE MESONS ($\mathit C$ = $\pm1$, $\mathit S$ = $\pm1$) (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

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

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

${{\mathit X}_{{1}}{(2900)}}$ Decay Modes
Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit D}^{-}}{{\mathit K}^{+}}$   seen 743
FOOTNOTES