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The state $\chi^{\vphantom\dagger}_{c0}(3915)$ has recently been demoted bythe Particle Data Group from its previous status as the conventional $c\bar c$$2 {}^3P_0$ state, largely due to the absence of expected $D\bar D$ decays. Wepropose that $\chi^{\vphantom\dagger}_{c0}(3915)$ is actually the lightest$c\bar c s \bar s$ state, and calculate the spectrum of such states using thediquark model, identifying many of the observed charmoniumlike states that lackopen-charm decay modes as $c\bar c s \bar s$. Among other results, we arguethat $Y(4140)$ is a $J^{PC} = 1^{++}$ $c\bar c s \bar s$ state that has beennot been seen in two-photon fusion largely as a consequence of the Landau-Yangtheorem.

$\chi^{\vphantom\dagger}_{c0}(3915)$ As the Lightest $c\bar c s \bar s$ State