Abstract
We investigate the chiral phase structure of three flavor QCD in a background magnetic field using the standard staggered action and the Wilson plaquette gauge action. We perform simulations on lattices with a temporal extent of and four spatial extents of , 16, 20 and 24. We choose a quark mass in lattice spacing as with corresponding pion mass estimated as such that there exists a crossover transition at vanishing magnetic fields, and adopt two values of magnetic field strength in lattice spacing and 2 corresponding to and 20, respectively. We find that the transition becomes stronger in the presence of a background magnetic field, and turns into a first order as seen from the volume scaling of the order parameter susceptibility as well as the metastable states in the time history of the chiral condensate. On the other hand, the chiral condensate and transition temperature always increase with even within the regime of a first order phase transition. This suggests that the discrepancy in the behavior of chiral condensates and transition temperature as a function of between earlier lattice studies using larger-than-physical pion masses with standard staggered fermions and those using physical pions with improved staggered fermions is mainly due to lattice cutoff effects.
2 More- Received 25 June 2020
- Accepted 17 August 2020
DOI:https://doi.org/10.1103/PhysRevD.102.054505
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society