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We determine the equation of state of QCD at finite chemical potential, toorder $(\mu_B/T)^6$, for a system of 2+1 quark flavors. The simulations areperformed at the physical mass for the light and strange quarks on severallattice spacings; the results are continuum extrapolated using lattices of upto $N_t=16$ temporal resolution. The QCD pressure and interaction measure arecalculated along the isentropic trajectories in the $(T,~\mu_B)$ planecorresponding to the RHIC Beam Energy Scan collision energies. Their behavioris determined through analytic continuation from imaginary chemical potentialsof the baryonic density. We also determine the Taylor expansion coefficientsaround $\mu_B=0$ from the simulations at imaginary chemical potentials.Strangeness neutrality and charge conservation are imposed, to match theexperimental conditions.Comment: 5 pages, 4 figure

The QCD equation of state at finite density from analytical continuation