Responses of hadrons to the chemical potential at finite temperature

Abstract

We present a framework to compute the responses of hadron masses to the chemical potential in lattice QCD simulations. As a first trial, the screening mass of the pseudoscalar meson and its first and second responses are evaluated. We present results on a 16×82×4 lattice with two flavors of staggered quarks below and above Tc. The responses to both the isoscalar and isovector chemical potentials are obtained. They show different behavior in the low and the high temperature phases, which may be explained as a consequence of chiral symmetry breaking and restoration, respectively. ©2002 The American Physical Society.