Impacts of inverse magnetic catalysis on screening masses of neutral pions and sigma mesons in hot and magnetized quark matter

We investigate the screening masses of neutral pions and sigma mesons in hot and magnetized quark matter in the framework of a two-flavor lattice-improved Nambu-Jona-Lasinio (NJL) model with a magnetic-field-dependent coupling constant, which is determined by utilizing the results from lattice QCD simulations. Since such a model can well reproduce inverse magnetic catalysis (IMC), by comparing with the standard NJL model, we systemically analyze the impacts of IMC on the temperature and magnetic field dependences of the longitudinal and transverse screening masses of the chiral partners, i.e., ,degrees and a mesons, as well as the screening mass differences between them. Particularly, it is found that the eB dependences of two alternative (pseudo)critical temperatures for the chiral transition defined by a - ,degrees meson screening mass differences are consistent with that defined by the quark condensate.

Automated summary

In this study, we investigate the screening masses of neutral pions and sigma mesons in hot and magnetized quark matter using an improved NJL model with a magnetic-field-dependent coupling constant. The results show that the effects of magnetic field on screening masses are consistent with the definition of quark condensate.