Is chiral symmetry broken and or restored in high-mass light baryons?

Details Is chiral symmetry broken and or restored in high-mass light baryons? Is chiral symmetry broken and or restored in high-mass light baryons?

2010-11-16

arxiv.org/abs/1011.3644v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 tables

Scientific paper

Based on a thorough comparison of the nucleon and $\Delta$ excitation spectrum with models we show that parity doublets observed in the mass spectra do not entail the consequence that highly excited $N$ or $\Delta$ resonances are insensitive to chiral symmetry breaking. Instead, the mechanism of mass generation in excited states is suggested to be the same as for the baryon ground states: the mass is assigned to fluctuating gluon fields and their strong attraction. In excited baryons, the field energy has to be integrated over a larger volume, and the total mass increases. Thus, also the additional mass of resonances, the excitation energy, is generated by spontaneous breaking of chiral symmetry.

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