The flavor universality of some mass splittings in hadrons

Abstract

The approximate chiral invariance of the two-flavor QCD is known to be spontaneously broken. This effect explains the relatively small pion mass and, as is widely believed, the mass splittings of would-be chiral partners --- the hadrons of equal spin but opposite parity lying in one multiplet of the chiral symmetry. We present experimental evidences that in reality such mass splittings in the meson sector seem to be approximately flavor-independent in all cases where they can be tested experimentally --- the spin 0 and 1. In addition, a partial flavor independence holds for spin $1/2$ baryons (namely among states in which at least one of quarks is not $u$ or $d$ one). This property allows to predict masses and quantum numbers for 10 new hadrons. Some interesting consequences are discussed.

arXiv comment9 pages

References in corpus (29)

• QCD and a Holographic Model of Hadrons
• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• Chiral symmetry breaking from five dimensional spaces
• QCD and strongly coupled gauge theories: challenges and perspectives
• Systematics of q anti-q states in the (n,M^2) and (J,M^2) planes
• Four Sorts of Mesons
• Restoration of chiral and $U(1{)}_A$ symmetries in excited hadrons
• Systematics of radial and angular-momentum Regge trajectories of light non-strange q\bar{q}-states
• Linear square-mass trajectories of radially and orbitally excited hadrons in holographic QCD
• 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
• Generalizing the Noether theorem for Hopf-algebra spacetime symmetries
• Towards understanding broad degeneracy in non-strange mesons
• Parity doubling in particle physics
• Systematics of heavy quarkonia from Regge trajectories on $(n,M^2)$ and $(M^2,J)$ planes
• Experimental indication on chiral symmetry restoration in meson spectrum
• Hydrogen like classification for light nonstrange mesons
• Cluster duality
• Is the spectrum of highly excited mesons purely coulombian?
• Note on universal description of heavy and light mesons
• Reply to "Comment on 'Systematics of radial and angular-momentum Regge trajectories of light non-strange qqbar-states' "
• The large degeneracy of excited hadrons and quark models
• Comments on `Systematics of radial and angular-momentum Regge trajectories of light non-strange $q\bar{q}$ states', Masjuan, Arriola and Broniowski
• Implications of the Crystal Barrel data for meson-baryon symmetries
• Hadrons and Chiral Symmetry
• Gluon Excitations and Quark Chiral Symmetry in the Meson Spectrum: an Einbein Solution to the Large Degeneracy Problem of Light Mesons
• Lagrangian alternative to QCD string
• Comment on "Is the spectrum of highly excited mesons purely coulombian?"