The Ds0(2590)+ as the dressed [formula omitted] 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 Ds+ 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 Ds0⁎(2317)+ and Ds1(2460)+, in this work we perform a coupled-channels calculation including the D(⁎)K(⁎), Ds(⁎)ω and Ds⁎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 P03 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.