Neutral pion masses within a hot and magnetized medium in a lattice-improved soft-wall AdS/QCD model
arxiv(2024)
摘要
We investigate chiral phase transitions and the screening masses, pole
masses, and thermal widths of neutral pion meson with finite temperature T
and magnetic field B in a lattice-improved AdS/QCD model, which is
constructed by fitting the lattice results of the pseudo-critical temperatures
( T_pc(B) ). Specifically, we have that the chiral condensate (σ)
undergoes a crossover phase transition demonstrating distinct magnetic
catalysis and inverse magnetic catalysis effects in very low and
high-temperature regions with fixed finite B, respectively. For the screening
masses, we find that the longitudinal component decreases with B at very low
and high temperatures and increases with B near T_pc. The
transverse component always increases with B at fixed T. However, both the
longitudinal and transverse screening masses increase with T at fixed B.
Furthermore, we find that the pole mass decreases with the increasing of B or
T. Besides, it is interesting to note that the thermal width shows similar
behavior to the longitudinal screening masses in the very high temperature
region.
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