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We investigate modifications of meson states, and restorations of broken symmetries at finite temperature utilizing spatial correlation functions computed using lattice QCD. The lattice QCD computations are carried out using the Highly Improved Staggered Quark action with dynamical physical strange quark and nearly-physical up/down quarks. We compute spatial correlation functions of meson states consisting of up/down, strange and charm quarks in the temperature range of 0.7 ≤ T/Tc ≤ 2.6, Tc being the transition temperature. We extract the screening masses from the exponential decays of the spatial correlators. Continuum extrapolated results reveal that, irrespective of the flavor content of the meson states, with rising temperatures the screening masses in the negative parity channel monotonically increase, whereas those in the positive parity channel first decrease and then increase. From the degeneracies of the chiral partners of the light meson states we find that the restoration of the chiral symmetry occurs at Tc, but the axial UA(1) symmetry remains manifestly broken till T ∼ 1.5Tc.

Thermal modifications of mesons, and restoration of broken symmetries from spatial correlation functions with HISQ action