Naslov
T-dependence of the axion mass from the tied U_A(1) and chiral symmetry restoration

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

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

Skup
COST Action CA15213 THOR annual meeting 2019

Mjesto i datum
Istanbul, Turska, 02.09.2019. - 06.09.2019

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
axion ; mass temperature ; QCD U_A(1) ; chiral symmetry restoration

Sažetak
Up to the scale of the spontaneous breaking of Peccei-Quinn symmetry, the axion mass M_a is determined by the QCD topological susceptibility χ(T) at all temperatures T. Using an approach tying the U_A(1) and chiral symmetry breaking, we calculate χ(T) for an effective Dyson-Schwinger model of nonperturbative QCD and obtain a good agreement with lattice results for χ(T), and thus also for M_a(T), for T as high as twice the chiral restoration temperature. The axion mass follows the dictate of the QCD topological susceptibility from vanishing T over the chiral phase transition to hight T where the chiral and U_A(1) symmetries are restored. Our prediction is additionally supported by the fact that our topological susceptibility yields the T-dependence of the U_A(1) anomaly- influenced masses of η' and η mesons which is consistent with experimental evidence.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Link/poveznica skupa:
https://indico.cern.ch/event/765437/

POVEZANOST RADA