arXiv subjects

Xiang-Ning Li

Publications and source records attributed to Xiang-Ning Li.

2 recordsLinked to original sources

arXiv2026

Mesonic screening correlators in an external imaginary electric field at finite temperature

External electromagnetic fields provide a useful probe of QCD matter, but real electric fields are hindered by the sign problem, motivating studies with imaginary electric fields. We investigate mesonic screening correlators in lattice QCD at finite temperature in the presence of such a background using staggered fermions. At low temperature, scalar screening masses increase with the field strength, while pseudo-scalar masses remain largely unchanged, and charge-asymmetric channels show additional structure. At high temperature, the correlators exhibit clear spatial oscillations with frequencies set by the quark electric charges. These results demonstrate nontrivial modifications of screening properties induced by external electric fields.

hep-lat↗

arXiv2026

Wilson loops with oppositely oriented plaquettes as a probe of center vortex structure

We study Wilson loops with a nontrivial orientation structure in lattice gauge theory as a probe of the center vortex picture. The observable is a single Wilson loop containing two plaquettes with opposite orientations, realized in two geometries referred to as the vertical and parallel configurations. The vertical case behaves consistently with expectations from the vortex picture. In contrast, the parallel configuration shows a deviation from the naive area-law expectation which cannot be explained solely by the opposite orientations of the plaquettes. We introduce a simple qualitative vortex model which accounts for this behavior and shows that the observed effect can still be understood within the vortex framework.

hep-lat↗