The Ds0(2590)+ as the dressed c(s)over-bar(21 S0) meson in a coupled-channels calculation

The recent discovery of the D-s0(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 D-s mesons such as the D*(s0)(2317)(+) and D-s1(2460)(+), in this work we perform a coupled-channels calculation including the D-(*()) K-(*()), D-(*())(s) omega and D*(s)eta channels, and study the impact of incorporating those channels in the mass of the bare c (s) over bar. The coupling between two and four-quark sectors is done by means of the P-3(0) 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. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).

Automated summary

The recent discovery of the D-s0(2590)(+) meson and its analysis of meson-meson channels effects suggest a non-negligible coupling with the D-(*())K-(*()) channel, resulting in a lower mass than predicted. This study investigates the impact of incorporating nearby meson-meson channels on the mass of the bare c (s) over bar through a coupled-channels calculation.