QCD with Nf =2 is a specially interesting system to investigate the chiral transition. The order of the transition has still not been established. We report the results of an in-depth numerical investigation performed with staggered fermions on lattices with Lt=4 and Ls=12,16,20,24,32 and quark masses amq ranging from 0.01335 to 0.307036. Using finite-size techniques we compare the scaling behavior of a number of thermodynamical susceptibilities with the expectations of O(4) and O(2) universality classes. Clear disagreement is observed. Indications of a first order transition are found. Preliminary reports of this work were presented at past Lattice conferences
The chiral transition in two-flavor QCD
D'ELIA, MASSIMO;DI GIACOMO, ADRIANO;
2006-01-01
Abstract
QCD with Nf =2 is a specially interesting system to investigate the chiral transition. The order of the transition has still not been established. We report the results of an in-depth numerical investigation performed with staggered fermions on lattices with Lt=4 and Ls=12,16,20,24,32 and quark masses amq ranging from 0.01335 to 0.307036. Using finite-size techniques we compare the scaling behavior of a number of thermodynamical susceptibilities with the expectations of O(4) and O(2) universality classes. Clear disagreement is observed. Indications of a first order transition are found. Preliminary reports of this work were presented at past Lattice conferencesI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
