Towards understanding broad degeneracy in non-strange mesons
Authors: S.S. Afonin
Abstract: The spectroscopic regularities of modern empirical data on the non-strange mesons up to 2.4 GeV can be summarized as a systematic clustering of states near certain values of energy. It is getting evident that some unknown X-symmetry triggers the phenomenon. We review the experimental status of this symmetry and recent theoretical attempts put forward for explanation of broad degeneracy.
preprint
By the way, a meson is a strongly interacting particle composed of a quark-antiquark pair.
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