XQCD 2018

QCD equation of state at finite baryon density is studied in the framework of a Cluster Expansion Model (CEM), which is based on a fugacity expansion of the net baryon density. CEM uses the leading two Fourier coefficients from lattice simulations at imaginary ${\mu }_B$ as the only model input. Excellent description of the available lattice data at both ${\mu }_B=0$ and at imaginary ${\mu }_B$ is obtained. Questions regarding the radius of convergence of the Taylor expansion, the analytic structure of CEM, and the effective parameterization of QCD equation of state at finite ${\mu }_B$ are discussed.