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- W2907646869 abstract "The $Z_{c}(3900)^pm/Z_c(3885)^pm$ and $Z_{c}(4020)^pm$ are two charmonium-like structures discovered in the $pi J/psi$ and $D^astbar D^{(ast)}+h.c.$ invariant mass spectra. Their nature is puzzling due to their charge, which forces its minimal quark content to be $cbar c ubar d$ ($cbar c dbar u$). Thus, it is necessary to explore four-quark systems in order to understand their inner structure. Additionally, their strong coupling to channels such as $pi J/psi$ and the closeness of their mass to $D^astbar D^{(ast)}$-thresholds stimulates both a molecular interpretation or a coupled-channels threshold effect. In this work we perform a coupled-channels calculation of the $I^G(J^{PC})=1^+(1^{+-})$ sector including $D^{(ast)}bar D^{ast}+h.c.$, $pi J/psi$ and $rhoeta_c$ channels in the framework of a constituent quark model which satisfactorily describes a wide range of properties of (non-)conventional hadrons containing heavy quarks. The meson-meson interactions are dominated by the non-diagonal $pi J/psi-D^astbar D^{(ast)}$ and $rhoeta_c-D^astbar D^{(ast)}$ couplings which indicates that the $Z_{c}(3900)^pm/Z_c(3885)^pm$ and $Z_{c}(4020)^pm$ are unusual structures. The study of the analytic structure of the $S$-matrix allows us to conclude that the point-wise behavior of the line shapes in the $pi J/psi$ and $Dbar D^*$ invariant mass distributions is due to the presence of two virtual states that produce the $Z_c$ peaks." @default.
- W2907646869 created "2019-01-11" @default.
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- W2907646869 date "2019-01-01" @default.
- W2907646869 modified "2023-10-17" @default.
- W2907646869 title "The $$Z_c$$ Z c structures in a coupled-channels model" @default.
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- W2907646869 doi "https://doi.org/10.1140/epjc/s10052-019-6552-7" @default.
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