The $D_{s0}(2590)^+$ as the dressed $c\bar s(2^1S_0)$ meson in a coupled-channels calculation

Abstract

The recent discovery of the Ds0(2590) + meson by the LHCb Collaboration has stimulated the analysis of meson-meson channels effects in the two-body quark-antiquark meson spectrum. This resonance, assigned to the radial excitation of the pseudoscalar D + s meson, has a mass much lower than the predictions of naive quark models, which could indicate a non-negligible D ( * ) K ( * ) coupling which reduces its mass. Based on the importance of nearby meson-meson thresholds in the dynamics of P-wave Ds mesons such as the D * s0 (2317) + and Ds1(2460) + , in this work we perform a coupledchannels calculation including the D ( * ) K ( * ) , D ( * ) s ω and D * s η channels, and study the impact of incorporating those channels in the mass of the bare cs. The coupling between two and four-quark sectors is done by means of the 3 P0 mechanism, with all the parameters constrained from previous studies of the heavy meson spectroscopy. The masses, widths and production line shapes of the resulting state are analyzed.

An updated review of the new hadron states

“…Later in Ref. [195] the authors studied the D s0 (2590) + as the dressed D s (2 1 S 0 ) meson in a coupled-channel framework. Their calculations were performed by including the D ( * ) K ( * ) , D In a recent study [196], the authors took into account the screening effects, and studied the mass spectrum and strong decays of the excited charmed-strange mesons using the modified relativized quark model.…”