标题： 罗伯格-维斯端点在具有背景磁场的$(2+1)$-味QCD中的研究 显示英文标题

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

摘要： 在本工作中，我们讨论了关于所谓的罗伯格-韦斯（RW）相变的初步结果，该相变在存在背景磁场的情况下，发现于重子化学势的虚数值情形下。我们在$N_t = 6, 8$格点上进行格点QCD模拟，使用$2+1$种stout-staggered费米子，在物理夸克质量下以及树级Symanzik改进的规范作用量。我们确定了有限磁场下RW端点的位置，并研究了该相变的阶数。 显示英文摘要

摘要： 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.