Journal Article

FZJ-2015-04120

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Baryon and meson screening masses

Wang, K.-l. ; Liu, Y.-X. (Corresponding Author) ; Chang, L. ; Roberts, C. D. ; Schmidt, S. M.FZJ*VS-I*

2013
Soc. [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/8869  doi:10.1103/PhysRevD.87.074038

Abstract: In a strongly coupled quark-gluon plasma, collective excitations of gluons and quarks should dominate over the excitation of individual quasifree gluon and quark modes. To explore this possibility, we computed screening masses for ground-state light-quark mesons and baryons at leading order in a symmetry-preserving truncation scheme for the Dyson-Schwinger equations using a confining formulation of a contact interaction at nonzero temperature. Meson screening masses are obtained from Bethe-Salpeter equations, and baryon analogues from a novel construction of the Faddeev equation, which employs an improved quark-exchange approximation in the kernel. Our treatment implements a deconfinement transition that is coincident with chiral symmetry restoration in the chiral limit, when both transitions are second order. Despite deconfinement, in all T=0 bound-state channels, strong correlations persist above the critical temperature, T>Tc; and, in the spectrum defined by the associated screening masses, degeneracy between parity-partner correlations is apparent for T≳1.3Tc. Notwithstanding these results, there are reasons (including Golberger-Treiman relations) to suppose that the inertial masses of light-quark bound states, when they may be defined, vanish at the deconfinement temperature, and that this is a signal of bound-state dissolution. Where a sensible comparison is possible, our predictions are consistent with results from contemporary numerical simulations of lattice-regularized QCD.

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Contributing Institute(s):

1. Theorie der Starken Wechselwirkung (IAS-4)
2. Theorie der starken Wechselwirkung (IKP-3)
3. Wissenschaftlicher Geschäftsbereich I (VS-I)

Research Program(s):

1. 531 - Hadron Structure and Dynamics (HSD) (POF2-531) (POF2-531)
2. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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