2022-08-09T23:47:55Zhttps://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.7799We 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.journal articleAmerican Physical Society2008-01application/pdfPhysical Review D177014508Physical Review DAA0077362415507998https://niigata-u.repo.nii.ac.jp/record/2278/files/77_1_014508.pdfenginfo:doi/10.1103/PhysRevD.77.014508(C) 2008 American Physical Society