The Roberge-Weiss endpoint in $(2+1)$-flavor QCD with background magnetic fields

TL;DR

This paper investigates the Roberge-Weiss transition in 2+1 flavor lattice QCD under background magnetic fields, determining the RW endpoint and analyzing the transition's nature using simulations at physical quark masses.

Contribution

It provides new lattice QCD results on the RW endpoint's location and transition order in the presence of magnetic fields, which was previously unexplored.

Findings

RW endpoint location varies with magnetic field strength

Transition order depends on magnetic field intensity

Preliminary results indicate magnetic fields influence the RW transition

Abstract

In this work we discuss our preliminary results regarding the so-called Roberge-Weiss (RW) transition, which is found for imaginary values of the baryon chemical potential, in the presence of a background magnetic field. We perform lattice QCD simulations on $N_t = 6, 8$ lattices with $2+1$ flavors of stout-staggered fermions at physical quark masses and the tree-level Symanzik improved gauge action. We determine the location the RW endpoint at finite magnetic fields and we study the order of the transition.