出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Recent results for screening masses at high temperature are presented. The spatial correlation
functions of operators with meson quantum numbers were obtained on quenched gauge configurations
with non-perturbatively improved Wilson quarks as well as, in a different round of
analysis, on the NF = 2+1 configurations generated in the course of RBC-Bielefeld’s analysis of
the Equation of State. While vector and axial vector channels signal the restoration of chiral symmetry
in both cases, in 2 + 1 flavor QCD pseudoscalar and isovector scalar become degenerate
only at a temperature higher than the chiral crossover one, thus indicating that the UA(1) is effectively
restored only at higher temperatures. In the investigated temperature range pseudoscalar
and vector screening masses do not become equal, contrary to the free case and to leading order
perturbation theory. For the quenched Wilson case the differences could be established in the
infinite volume continuumm limit.
