2022-08-17T02:29:51Zhttps://niigata-u.repo.nii.ac.jp/oaioai:niigata-u.repo.nii.ac.jp:000022782021-03-01T20:40:37ZExistence of the critical point in finite density lattice QCDExistence of the critical point in finite density lattice QCDEjiri, S.(C) 2008 American Physical SocietyWe 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.American Physical Society2008-01engjournal articlehttp://hdl.handle.net/10191/27632https://niigata-u.repo.nii.ac.jp/records/2278info:doi/10.1103/PhysRevD.77.014508AA0077362415507998Physical Review DPhysical Review D771014508https://niigata-u.repo.nii.ac.jp/record/2278/files/77_1_014508.pdfapplication/pdf643.3 kB2019-07-29