Hydrogen like classification for light nonstrange mesons

Details Hydrogen like classification for light nonstrange mesons Hydrogen like classification for light nonstrange mesons

2007-09-27

arxiv.org/abs/0709.4444v2

Int.J.Mod.Phys.A23:4205-4217,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Extended version; to appear in Int. J. Mod. Phys. A

Scientific paper

10.1142/S0217751X0804175X

The recent experimental results on the spectrum of highly excited light nonstrange mesons are known to reveal a high degree of degeneracy among different groups of states. We revise some suggestions about the nature of the phenomenon and put the relevant ideas into the final shape. The full group of approximate mass degeneracies is argued to be $SU(2)_f\times I\times O(4)$, where $I$ is the degeneracy of isosinglets and isotriplets and O(4) is the degeneracy group of the relativistic hydrogen atom. We discuss the dynamical origin and consequences of considered symmetry with a special emphasis on distinctions of this symmetry from the so-called chiral symmetry restoration scenario.

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