Probing the infrared quark mass from highly excited baryons

Understand

We argue that three-quark excited states naturally group into quartets, split into two parity doublets, and that the mass splittings between these parity partners decrease higher up in the baryon spectrum.

• This decreasing mass difference can be used to probe the running quark mass in the mid-infrared power-law regime.
• A measurement of masses of high-partial wave Delta* resonances should be sufficient to unambiguously establish the approximate degeneracy.
• We test this concept with the first computation of excited high-j baryon masses in a chirally invariant quark model.