Using highly excited baryons to catch the quark mass
| Autor: | Marco Cardoso, Felipe José Llanes Estrada, Pedro Bicudo, T. Van Cauteren |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Physics
Quark Quantum chromodynamics Particle physics QC1-999 Computation High Energy Physics::Lattice Quark model High Energy Physics::Phenomenology FOS: Physical sciences Física Parity (physics) Baryon High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) visual_art Excited state visual_art.visual_art_medium Goldstone |
| Zdroj: | E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid E-Prints Complutense. Archivo Institucional de la UCM instname EPJ Web of Conferences, Vol 3, p 03012 (2010) |
| Popis: | 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 Delta* 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. 6 pages, 9 figures, To appear in the proceedings of the 19th International IUPAP Conference on Few-Body Problems in Physics; added acknowledgment, hyphenized author name |
| Databáze: | OpenAIRE |
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