Horvatić, Davor; Kekez, Dalibor; Klabučar, Dubravko
(2019)
η′ and η mesons at high T when the U_A(1) and chiral symmetry breaking are tied.
Physical Review D, 99
(1).
ISSN 2470-0010
Abstract
The approach to the η′−η complex employing chirally well-behaved quark-antiquark bound states and incorporating the non-Abelian axial anomaly of QCD through the generalization of the Witten-Veneziano relation is extended to finite temperatures. Employing the chiral condensate has led to a sharp chiral and UA(1) symmetry restoration, but with the condensates of quarks with realistic explicit chiral symmetry breaking— which exhibit a smooth, crossover chiral symmetry restoration in qualitative agreement with lattice QCD results—we get a crossover UA(1) transition with a smooth and gradual melting of anomalous mass contributions. In this way, we obtain a substantial decrease in the η′ mass around the chiral transition temperature, but no decrease in the η mass. This is consistent with current empirical evidence.
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7075
WOS:000455365100005
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