title: Phase diagram and critical end point for strongly interacting quarks.
abstract: We introduce a method based on chiral susceptibility, which enables one to draw a phase diagram in the chemical-potential-temperature plane for strongly interacting quarks whose interactions are described by any reasonable gap equation, even if the diagrammatic content of the quark-gluon vertex is unknown. We locate a critical end point at (μ(E),T(E))∼(1.0,0.9)T(c), where T(c) is the critical temperature for chiral-symmetry restoration at μ=0, and find that a domain of phase coexistence opens at the critical end point whose area increases as a confinement length scale grows.
authors.affiliation: Department of Physics, Center for High Energy Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: Si-xue
authors.initials: SX
authors.lastname: Qin
authors.forename: Lei
authors.initials: L
authors.lastname: Chang
authors.forename: Huan
authors.initials: H
authors.lastname: Chen
authors.forename: Yu-xin
authors.initials: YX
authors.lastname: Liu
authors.forename: Craig D
authors.initials: CD
authors.lastname: Roberts