Critical point in finite density lattice QCD by canonical approach

Details Critical point in finite density lattice QCD by canonical approach Critical point in finite density lattice QCD by canonical approach

2009-08-04

arxiv.org/abs/0908.0544v2

Nucl.Phys.A830:717c-720c,2009

Physics

High Energy Physics

High Energy Physics - Lattice

4 pages, 2 figures, To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee

Scientific paper

10.1016/j.nuclphysa.2009.09.060

We propose a method to find the QCD critical point at finite density calculating the canonical partition function ${\cal Z}_{\rm C} (T,N)$ by Monte-Carlo simulations of lattice QCD, and analyze data obtained by a simulation with two-flavor p4-improved staggered quarks with pion mass $m_{\pi} \approx 770 {\rm MeV}$. It is found that the shape of an effective potential changes gradually as the temperature decreases and a first order phase transition appears in the low temperature and high density region. This result strongly suggests the existence of the critical point in the $(T, \mu_q)$ phase diagram.

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