The curvature of the chiral pseudocritical line from LQCD: analytic continuation and Taylor expansion compared

摘要

We present a determination of the curvature kappa of the chiral pseudocritical line from N-f = 2+1 lattice QCD at the physical point obtained by adopting the Taylor expansion approach. Numerical simulations performed at three lattice spacings lead to a continuum extrapolated curvature kappa = 0.0145(25), a value that is in excellent agreement with continuum limit estimates obtained via analytic continuation within the same discretization scheme, kappa = 0.0135(20). The agreement between the two calculations is a solid consistency check for both methods.