Chiral model forq¯qandqq¯qqmesons
Mauro Napsuciale,S. Rodríguez +1 more
TLDR
In this paper, it was shown that the spectrum of pseudoscalar and scalar mesons exhibits a quasidegenerate chiral nonet in the energy region around 1.4 GeV whose scalar component has a slightly inverted spectrum.Abstract:
We point out that the spectrum of pseudoscalar and scalar mesons exhibits a quasidegenerate chiral nonet in the energy region around 1.4 GeV whose scalar component has a slightly inverted spectrum. Based on the empirical linear rising of the mass of a hadron with the number of constituent quarks which yields a mass around 1.4 GeV for tetraquarks, we conjecture that this quasichiral nonet arises from the mixing of a chiral nonet composed of tetraquarks with conventional $\overline{q}q$ states. We explore this possibility in the framework of a chiral model assuming a tetraquark chiral nonet around 1.4 GeV with chiral symmetry realized directly. We stress that ${U}_{A}(1)$ transformations can distinguish $\overline{q}q$ from tetraquark states, although it cannot distinguish specific dynamics in the later case. We find that the measured spectrum is consistent with this picture. In general, pseudoscalar states arise as mainly $\overline{q}q$ states but scalar states turn out to be strong admixtures of $\overline{q}q$ and tetraquark states. We work out also the model predictions for the most relevant couplings and calculate explicitly the strong decays of the ${a}_{0}(1450)$ and ${K}_{0}^{*}(1430)$ mesons.read more
Citations
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From controversy to precision on the sigma meson: a review on the status of the non-ordinary $f_0(500)$ resonance
TL;DR: The sigma meson has been controversial for almost six decades, despite playing a central role in the spontaneous chiral symmetry of QCD or in the nucleon-nucleon attraction as discussed by the authors.
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From controversy to precision on the sigma meson: A review on the status of the non-ordinary f(0)(500) resonance
TL;DR: The existence and properties of the sigma meson have been controversial for almost six decades, despite playing a central role in the spontaneous chiral symmetry of QCD or in the nucleon-nucleon attraction.
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Mixing of scalar tetraquark and quarkonia states in a chiral approach
TL;DR: In this article, a chiral invariant Lagrangian describing the tetraquark-quark interaction is considered at the leading and sub-leading order in the large-${N}_{c}$ expansion.
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Vacuum phenomenology of the chiral partner of the nucleon in a linear sigma model with vector mesons
TL;DR: In this paper, the authors investigated a linear sigma model with global chiral symmetry and showed that an appreciable amount of the nucleon mass originates from sources other than the chiral condensate.
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