A faster method of computation of lattice quark number susceptibilities

Fakultat fu¨r Physik, Universita¨t Bielefeld, D-33615 Bielefeld, GermanyWe compute the quark number susceptibilities in two flavor QCD for staggered fermions by addingthe chemical potential as a Lagrange multiplier for the point-split number density term. Since lessernumber of quark propagators are required at any order, this method leads to faster computations.We propose a subtraction procedure to remove the inherent undesired lattice terms and check thatit works well by comparing our results with the existing ones where the elimination of these terms isanalytically guaranteed. We also show that the ratios of susceptibilities are robust, opening a doorfor better estimates of location of the QCD critical point through the computation of the tenth andtwelfth order baryon number susceptibilities without significant additional computational overload.