Mixing of scalar tetraquark and quarkonia states in a chiral approach
TLDR
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.Abstract:
A chiral invariant Lagrangian describing the tetraquark-quarkonia interaction is considered at the leading and subleading order in the large-${N}_{c}$ expansion. Spontaneous chiral symmetry breaking generates mixing of scalar tetraquark and quarkonia states and nonvanishing tetraquark condensates. In particular, the mixing strength is related to the decay strengths of tetraquark states into pseudoscalar mesons. The results show that scalar states below 1 GeV are mainly four-quark states and the scalars between 1 and 2 GeV quark-antiquark states, probably mixed with the scalar glueball in the isoscalar sector.read more
Citations
More filters
Journal ArticleDOI
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.
Journal ArticleDOI
Baryons as relativistic three-quark bound states
TL;DR: In this paper, the spectrum and electromagnetic properties of baryons described as relativistic three-quark bound states within QCD are discussed from a theoretical perspective, focusing on nonperturbative QCD as encoded in the functional approach via Dyson-Schwinger and Bethe-Salpeter equations.
Journal ArticleDOI
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.
Journal ArticleDOI
Baryons as relativistic three-quark bound states
TL;DR: In this article, the spectrum and electromagnetic properties of baryons described as relativistic three-quark bound states within QCD are discussed from a theoretical perspective, focusing on nonperturbative QCD as encoded in the functional approach via Dyson-Schwinger and Bethe-Salpeter equations.
Journal ArticleDOI
QCD at finite temperature and chemical potential from Dyson-Schwinger equations
TL;DR: The phase diagram of QCD, the properties of quarks and gluons and the resulting properties of strongly interacting matter at finite temperature and chemical potential are discussed in this paper.
References
More filters
Journal ArticleDOI
Computation of the quantum effects due to a four-dimensional pseudoparticle
TL;DR: In this paper, a detailed quantitative calculation is carried out of the tunneling process described by the Belavin-Polyakov-Schwarz-Tyupkin field configuration, where a certain chiral symmetry is violated as a consequence of the Adler-Bell-Jackiw anomaly.
Journal ArticleDOI
Baryons in the 1/n Expansion
TL;DR: In this article, the existing results concerning mesons and glue states in the large-N limit of QCD are reviewed, and it is shown how to fit baryons into this picture.
Journal ArticleDOI
Hadron Masses in a Gauge Theory
TL;DR: In this paper, the authors explore the implications for hadron spectroscopy of the "standard" gauge model of weak, electromagnetic, and strong interactions, and use the asymptotic freedom of the model to argue that for the calculation of hadron masses, the short-range quark-quark interaction may be Coulomblike.
Journal ArticleDOI
Instantons in QCD
Thomas Schäfer,Edward Shuryak +1 more
TL;DR: In this article, the authors review the theory and phenomenology of instantons in quantum chromodynamics (QCD) and provide a pedagogical introduction to semiclassical methods in quantum mechanics and field theory.