Quark number susceptibilities at high temperatures

Understand

We calculate second and fourth order quark number susceptibilities for 2+1 flavor QCD in the high temperature region.

• In our study we use two improved staggered fermion formulations, namely the highly improved staggered quark formulation, and the so-called p4 formulation, as well as several lattice spacings.
• Second order quark number susceptibilities are calculated using both improved staggered fermion formulations, and we show that in the continuum limit the two formulations give consistent results.
• The fourth order quark number susceptibilities are studied only using the p4 formulation and at non-zero lattice spacings.