Using highly excited baryons to catch the quark mass
Dept. Physics and Astronomy, Ghent University,
2 Dpto. Física, Instituto Superior Técnico, Avda. Rovisco Pais, 1096 Lisbon, Portugal
3 Dpto. Física Teórica I, Universidad Complutense, Avda. Complutense s/n, 28040 Madrid, Spain
a e-mail: email@example.com
Chiral symmetry in QCD can be simultaneously in Wigner and Goldstone modes, depending on the part of the spectrum examined. The transition regime between both, exploiting for example the onset of parity doubling in the high baryon spectrum, can be used to probe the running quark mass in the mid-IR power-law regime. In passing we also argue that three-quark states naturally group into same-ﬂavor quartets, split into two parity doublets, all splittings decreasing high in the spectrum. We propose that a measurement of masses of high-partial wave ∆* resonances should be suﬃcient to unambiguously establish the approximate degeneracy and see the quark mass running. We test these concepts with the ﬁrst computation of the spectrum of high-J excited baryons in a chiral-invariant quark model.
© Owned by the authors, published by EDP Sciences, 2010