T-dependence of the axion mass from the tied U_A(1) and chiral symmetry restoration (CROSBI ID 697891)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Klabučar, Dubravko ; Horvatić, Davor ; Kekez, Dalibor
engleski
T-dependence of the axion mass from the tied U_A(1) and chiral symmetry restoration
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.
axion ; mass temperature ; QCD U_A(1) ; chiral symmetry restoration
Link/poveznica skupa: https://indico.cern.ch/event/765437/
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Podaci o prilogu
2019.
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Podaci o matičnoj publikaciji
Podaci o skupu
COST Action CA15213 THOR annual meeting 2019
predavanje
02.09.2019-06.09.2019
Istanbul, Turska