engleski

Temperature dependence of the axion mass when the U_A(1) and chiral symmetry breaking are tied

Up to the scale of spontaneous breaking of Peccei-Quinn symmetry, the axion mass m_a(T) is given by the QCD topological susceptibility χ(T) at all temperatures T. From an approach tying the U_A(1) and chiral symmetry breaking and getting good T-dependence of η and η' mesons, we get χ(T) for an effective Dyson- Schwinger model of nonperturbative QCD. Comparison with lattice results for χ(T), and thus also for m_a(T), shows good agreement for temperatures ranging from zero up to the double of the chiral restoration temperature T_c.

axion mass axial U(1) chiral SU(3) QCD symmetry breaking temperature dependence

Mrežna stranica skupa Excited QCD 2019 https://indico.cern.ch/event/720726/