Do parity doublets in the baryon spectrum reflect restoration of chiral symmetry?

Details Do parity doublets in the baryon spectrum reflect restoration of chiral symmetry? Do parity doublets in the baryon spectrum reflect restoration of chiral symmetry?

2002-12-17

arxiv.org/abs/hep-ph/0212241v3

Phys.Lett. B559 (2003) 144-152

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 1 fig

Scientific paper

10.1016/S0370-2693(03)00338-1

We discuss the mass spectrum of highly-excited nucleon and $\Delta^*$ resonances. The spectrum exhibits parity doublets, pairs of resonances of identical total angular momentum J but of opposite parity. It has been proposed that the parity doublets evidence restoration of chiral symmetry at large baryon excitation energies. We compare this conjecture with the possibility that high-mass states are organized into $(L,S)$-multiplets with defined intrinsic quark spins and orbital angular momenta. Indeed, the latter interpretation results in a better description of the data. There is however a small and statisticially not very significant trend of the data which might indicate that chiral symmetry is not yet restored but does influence the masses of highly excited states.

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