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- Title
The Zc structures in a coupled-channels model.
- Authors
Ortega, Pablo G.; Segovia, Jorge; Entem, David R.; Fernández, Francisco
- Abstract
The Zc(3900)±/Zc(3885)± and Zc(4020)± are two charmonium-like structures discovered in the πJ/ψ and D∗D¯(∗)+h.c. invariant mass spectra. Their nature is puzzling due to their charge, which forces its minimal quark content to be cc¯ud¯ (cc¯du¯). Thus, it is necessary to explore four-quark systems in order to understand their inner structure. Additionally, their strong coupling to channels such as πJ/ψ and the closeness of their mass to D∗D¯(∗)-thresholds stimulates both a molecular interpretation or a coupled-channels threshold effect. In this work we perform a coupled-channels calculation of the IG(JPC)=1+(1+-) sector including D(∗)D¯∗+h.c., πJ/ψ and ρηc 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 πJ/ψ-D∗D¯(∗) and ρηc-D∗D¯(∗) couplings which indicates that the Zc(3900)±/Zc(3885)± and Zc(4020)± 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 πJ/ψ and DD¯∗ invariant mass distributions is due to the presence of two virtual states that produce the Zc peaks.
- Subjects
CHARM particles; MESONS; HADRONS; GEOMETRIC vertices; CENTER (Mathematics)
- Publication
European Physical Journal C -- Particles & Fields, 2019, Vol 79, Issue 1, p1
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-019-6552-7