Naslov
T-dependence of η' and η masses and the restorations of the U_A(1) and the SU_A(3) chiral symmetry

Autori
Klabučar, Dubravko ; Horvatić, Davor ; Kekez, Dalibor

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, pp prezentacija, znanstveni

Skup
Day of Femtoscopy (A femtoszkópia napja)

Mjesto i datum
Gyöngyös, Mađarska, 31.10.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
U_A(1) and SU_A(3) chiral symmetry ; QCD ; η' ; η mesons ; temperature dependence

Sažetak
The approach to the η'-η complex using chirally well-behaved quark-antiquark pseudoscalar bound-state solutions 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 U_A(1) symmetry restoration. However, 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 U_A(1) transition, with smooth and gradual melting of anomalous mass contributions. This way we obtain a substantial drop of the η' mass around the chiral transition temperature, but no η mass drop, in agreement with the present empirical evidence.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Mrežna stranica skupa Day of Femtoscopy (A
femtoszkópia napja) 2019:
https://indico.cern.ch/event/858268/

POVEZANOST RADA