Dynamical $\mathbf{O}(4)$-Symmetry in the Light Meson Spectrum within the Framework of the Regge Approach

Abstract

The light mesons tend to cluster near certain values of mass. As was noticed almost twenty years ago, the emergent degeneracy is of the same type as the dynamical $O(4)$-symmetry of the Coulomb potential in the hydrogen atom. The meson mass spectrum can be well approximated by the linear Regge trajectories of the kind $M^2=al+b{n}_r+c$, where $l$ and $n_r$ are angular momentum and radial quantum numbers and $a$, $b$, $c$ are parameters. Such a spectrum arises naturally within the hadron string models. Using 2024 data from the Particle Data Group, various fits for $M^2(l,n_r)$ were performed. Our analysis seems to confirm that $a\approx b$ in the light non-strange mesons, i.e., their masses depend on the sum $l+n_r$ as prescribed by the hydrogen-like $O(4)$-symmetry. Using the semiclassical approximation, we discuss on a simple qualitative level which kind of string-like semirelativistic approaches are more favored by the experimental data.

11 pages, based on the contribution to ICPPA 2024

References in corpus (12)

• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• Systematics of q anti-q states in the (n,M^2) and (J,M^2) planes
• Systematics of radial and angular-momentum Regge trajectories of light non-strange q\bar{q}-states
• Highly Excited Mesons, Linear Regge Trajectories and the Pattern of the Chiral Symmetry Realization
• Properties of new unflavored mesons below 2.4 GeV
• Light meson spectrum and classical symmetries of QCD
• Towards understanding broad degeneracy in non-strange mesons
• Generalizing the Noether theorem for Hopf-algebra spacetime symmetries
• Hydrogen like classification for light nonstrange mesons
• Is the spectrum of highly excited mesons purely coulombian?
• Dimension-2 condensates, zeta-regularization and large-Nc Regge Models
• The large degeneracy of excited hadrons and quark models

Cited by in corpus (1)

• The experimental observation of $a_0(1710)$: Long awaited from Regge approach