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Using highly excited baryons to catch the quark mass

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Llanes Estrada, Felipe José and Bicudo, P. and Cardoso, M. and Van Cauteren, T. (2009) Using highly excited baryons to catch the quark mass. EPJ Web of Conferences, 3 . ISSN 2100-014X

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Official URL: http://dx.doi.org/10.1051/epjconf/20100303012


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Abstract

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


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© Owned by the authors, published by EDP Sciences, 2010.
Work supported by grant numbers UCM-BSCH GR58/08 910309, FPA2007-29115-E, FPA2008-00592, FIS2008- 01323, CERN/FP /83582/2008, POCI/FP /81933/2007, /81913/2007, PDCT/FP /63907/2005 and /63923/2005, Spain-Portugal bilateral grant HP2006-0018 / E-56/07, as well as the Flanders Research Foundation (FWO). FLE acknowledges useful conversations with Craig Roberts, Eric Swanson and Christoph Hanhart during the recent Bad- Honnef meetings.
International Iupap Conference on Few-Body Problems in Physics(19. 2009. Bonn, Alemania)

Uncontrolled Keywords:Chiral-Symmetry, Effective Restoration, Model, Spectrum, Lattice, Mesons
Subjects:Sciences > Physics
ID Code:24097
Deposited On:15 Jan 2014 14:20
Last Modified:20 Apr 2018 18:39

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