η' and η mesons at high T when the U_A(1) and chiral symmetry breaking are tied

Horvatić, Davor and Kekez, Dalibor and 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). pp. 14007-11. ISSN 1550-7998

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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.

Item Type: Article
Date: January 2019
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2019 American Physical Society. Published under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3. Received 16 October 2018; Published 9 January 2019.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 29 Mar 2019 10:53
Last Modified: 29 Mar 2019 10:53
URI: http://digre.pmf.unizg.hr/id/eprint/5908

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