Mapping chiral symmetry breaking in the excited baryon spectrum



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Bicudo, Pedro and Cardoso, Marco and Llanes Estrada, Felipe José and Van Cauteren, Tim (2016) Mapping chiral symmetry breaking in the excited baryon spectrum. Physical review D, 94 (5). ISSN 2470-0010

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We study the conjectured “insensitivity to chiral symmetry breaking” in the highly excited light baryon spectrum. While the experimental spectrum is being measured at JLab and CBELSA/TAPS, this insensitivity remains to be computed theoretically in detail. As the only existing option to have both confinement, highly excited states, and chiral symmetry, we adopt the truncated Coulomb-gauge formulation of QCD, considering a linearly confining Coulomb term. Adopting a systematic and numerically intensive variational treatment up to 12 harmonic oscillator shells we are able to access several angular and radial excitations. We compute both the excited spectra of I=1/2 and I=3/2 baryons, up to large spin J=13/2, and study in detail the proposed chiral multiplets. While the static-light and light-light spectra clearly show chiral symmetry restoration high in the spectrum, the realization of chiral symmetry is more complicated in the baryon spectrum than earlier expected.

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© 2016 American Physical Society.
P. B. and M. C. acknowledge the use of the CPU and GPU servers of PtQCD, supported by CFTP, FCT, and NVIDIA and Grant No. FCT UID/FIS/00777/2013. M. C. is supported by FCT under Contract No. SFRH/BPD/73140/2010. The work of F. J. L. E. relied on the Spanish Excellence Network on Hadronic Physics Grant No. FIS2014-57026-REDT, and Grants No. UCM:910309 and No. MINECO:FPA2014-53375-C2-1-P. F. J. L. E. also thanks the Department of Energy’s Institute for Nuclear Theory at the University of Washington for its partial support and hospitality. T. V C. work was partially performed at Ghent University with support of the Fund for Scientific Research of Flanders.

Uncontrolled Keywords:Relativistic quark-model; P-3(0) condensed vacuum; Coulomb gauge qcd; Effective restoration; Resonances; Mesons; Forces; Photoproduction; Equation; Systems
Subjects:Sciences > Physics
ID Code:39833
Deposited On:27 Oct 2016 15:56
Last Modified:07 Nov 2016 18:57

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