4.7 Article

The strange partner of the Zc structures in a coupled-channels model

Journal

PHYSICS LETTERS B
Volume 818, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.physletb.2021.136382

Keywords

Potential models; Charmed strange mesons; Exotic mesons

Funding

  1. Ministerio de Ciencia e Innovacion [PID2019-105439GB-C22/AEI/10.13039/501100011033]
  2. EU Horizon 2020 research and innovation program, STRONG-2020 project [824093]

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The discovery of the Z(cs)(3985)(-) structure expands the theory of hadron structures beyond traditional models. The existence of Z(cs)(3985)(-) can be predicted using SU(3) flavor symmetry. The analytical structure of the S-matrix analysis confirms that the structure is due to the presence of a virtual pole.
The discovery of a new charged structure in the K+ recoil-mass spectrum near the Ds-D*(0)/D-s*-D-0 threshold, dubbed Z(cs)(3985)(-), reinforce the idea that the structure of hadrons goes beyond the naive qqq and the q (q) over bar structures. The existence of this state, with quark content c (c) over bars (u) over bar, can be expected from the well-established Z(c)(3900)+/- and Z(c)(4020) states using SU(3) flavor symmetry. The Z(c) structures have been explained using the chiral constituent quark model in a coupled-channels calculation and, in this work, we undertake the study of the Z(cs)(3985)(-) using the same model. We are able to reproduce the K+ recoil-mass spectrum without any fine tuning of the model parameters. The study of the analytical structure of the S-matrix allows us to conclude that the structure is due to the presence of one virtual pole. A second state, the SU(3) flavor partner of the Z(c)(4020) is predicted at similar to 4110 MeV/c(2). New states in the hidden bottom strange sector are also predicted. (C) 2021 The Author(s). Published by Elsevier B.V.

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