2022-08-13T06:06:34Zhttps://niigata-u.repo.nii.ac.jp/oaioai:niigata-u.repo.nii.ac.jp:000310052021-03-01T10:00:33ZStudy of the critical point in lattice QCD at high temperature and densityStudy of the critical point in lattice QCD at high temperature and densityEjiri, Shinji169272We 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, Germanyconference paperSISSA2007-08application/pdfPoS - Proceedings of Science181Lattice200717PoS - Proceedings of Science18248039https://niigata-u.repo.nii.ac.jp/record/31005/files/LATTICE 2007_181.pdfeng© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.