Parity doubling in the high baryon spectrum: near-degenerate three-quark quartets - High Energy Physics - PhenomenologyReport as inadecuate




Parity doubling in the high baryon spectrum: near-degenerate three-quark quartets - High Energy Physics - Phenomenology - Download this document for free, or read online. Document in PDF available to download.

Abstract: We report on the first calculation of excited baryons with a chirallysymmetric Hamiltonian, modeled after Coulomb gauge QCD or upgraded from theCornell meson potential model to a field theory in all of Fock-space showingthe insensitivity to chiral symmetry breaking. As has recently been understood,this leads to doubling between two hadrons of equal spin and opposite parity.As a novelty we show that three-quark, for example Delta states, group intoquartets with two states of each parity, all four states having equal angularmomentum J. Diagonalizing the chiral charge expressed in terms of quarks weshow that the quartet is slightly split into two parity doublets by the tensorforce, all splittings decreasing to zero high in the spectrum. Our specificcalculation is for the family of maximum-spin excitations of the Delta baryon.We provide a model estimate of the experimental accuracy needed to establishChiral Symmetry Restoration in the high spectrum.We suggest that a measurement of masses of high-partial wave Delta resonanceswith an accuracy of 50 MeV should be sufficient to unambiguously establish theapproximate degeneracy, and test the concept of running quark mass in theinfrared.



Author: Felipe J. Llanes-Estrada Complutense Madrid, Pedro Bicudo, Marco Cardoso IST Lisboa, Tim Van Cauteren Ghent

Source: https://arxiv.org/







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