@inproceedings{oai:niigata-u.repo.nii.ac.jp:00031005,
 author = {Ejiri, Shinji},
 book = {PoS - Proceedings of Science, PoS - Proceedings of Science},
 issue = {181},
 month = {Aug},
 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 μq/T >_～2.5. The effective potential as a function of the quark number density is also studied. We calculate the chemical potential as a function of the density from the canonical partition function and discuss the existence of the first order phase transition line., The XXV Internaitonal Symposium on Lattice Field Theory July 30 - August 4 2007 Regensburug, Germany},
 pages = {1--7},
 publisher = {SISSA},
 title = {Study of the critical point in lattice QCD at high temperature and density},
 volume = {Lattice2007},
 year = {2007}
}