The state chi(c0)(3915) has recently been demoted by the Particle Data Group from its previous status as the conventional c (c) over bar2(3)P(0) state, largely due to the absence of expected D (D) over bar decays. We propose that chi(c0)(3915) is actually the lightest c (c) over bars (s) over bar state, and calculate the spectrum of such states using the diquark model, identifying many of the observed charmoniumlike states that lack open-charm decay modes as c (c) over bars (s) over bar. Among other results, we argue that Y(4140) is a J(PC) = 1(++) state that has been not been seen in two-photonfusion largely as a consequence of the Landau-Yang theorem.
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|Titolo:||chi(c0)(3915) as the lightest c(c)over-bars(s)over-bar state|
|Data di pubblicazione:||2016|
|Appare nella tipologia:||01a Articolo in rivista|