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Comments on the U(1) axial symmetry and the chiral transition in QCD (1410.3734v1)

Published 14 Oct 2014 in hep-ph and hep-lat

Abstract: We analyze (using a chiral effective Lagrangian model) the scalar and pseudoscalar meson mass spectrum of QCD at finite temperature, above the chiral transition at $T_c$, looking, in particular, for signatures of a possible breaking of the $U(1)$ axial symmetry above $T_c$. A detailed comparison between the case with a number of light quark flavors $N_f\geq 3$ and the (remarkably different) case $N_f=2$ is performed.

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