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Computations of screening masses in finite-temperature QCD at finite densityare plagued by the sign problem and have been performed so far with animaginary chemical potential. Here, we use a dual formulation of aPolyakov-loop model which allows the determination of screening masses at realbaryon chemical potential. This is a second paper in a series devoted to adetailed study of dual Polyakov-loop models at finite density. While the firstpaper was mainly devoted to establishing the phase diagram of the model, herewe compute correlation functions of the Polyakov loops and the second-momentcorrelation length at non-zero chemical potential. This enables us to evaluatenumerically the screening masses from correlations of the real and imaginaryparts of the Polyakov loops. We also compute these masses in the mean-fieldapproximation and compare with numerical results. In addition, we provide aquantitative improvement of the general phase diagram presented in the firstpaper.

Dual simulation of a Polyakov loop model at finite baryon density: correlations and screening masses