@article{oai:niigata-u.repo.nii.ac.jp:00002278,
 author = {Ejiri, S.},
 issue = {1},
 journal = {Physical Review D, Physical Review D},
 month = {Jan},
 note = {We propose a method to probe the nature of phase transitions in lattice QCD at finite temperature and density, which is based on the investigation of an effective potential as a function of the average plaquette. We analyze data obtained in a simulation of two-flavor QCD using p4-improved staggered quarks with bare quark mass m/T=0.4 and find that a first order phase transition line appears in the high density regime for μ q /T≳2.5 . We also discuss the difference between the phase structures of QCD with nonzero quark chemical potential and nonzero isospin chemical potential.},
 title = {Existence of the critical point in finite density lattice QCD},
 volume = {77},
 year = {2008}
}