Baryon masses from lattice QCD: Beyond the perturbative chiral regime - art. no. 074502

Consideration of the analytic properties of pion-induced baryon self-energi es leads to new functional forms for the extrapolation of light baryon mass es. These functional forms reproduce the leading non-analytic behavior of c hiral perturbation theory, the correct non-analytic behavior at the N pi th reshold and the appropriate heavy-quark limit. They involve only three unkn own parameters, which may be obtained by fitting to lattice data. Recent dy namical fermion results from CP-PACS and UKQCD are extrapolated using these new functional forms. We also use these functions to probe the limit of ap plicability of chiral perturbation theory to the extrapolation of lattice Q CD results.