Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2002-04-09
Phys.Rev.D66:074507,2002
Physics
High Energy Physics
High Energy Physics - Lattice
26 pages, 25 figures, minor modification
Scientific paper
10.1103/PhysRevD.66.074507
We propose a new method to investigate the thermal properties of QCD with a small quark chemical potential $\mu$. Derivatives of the phase transition point with respect to $\mu$ are computed at $\mu=0$ for 2 flavors of p-4 improved staggered fermions with $ma=0.1,0.2$ on a $16^3\times4$ lattice. The resulting Taylor expansion is well behaved for the small values of $\mu_{\rm q}/T_c\sim0.1$ relevant for RHIC phenomenology, and predicts a critical curve $T_c(\mu)$ in reasonable agreement with estimates obtained using exact reweighting. In addition, we contrast the case of isoscalar and isovector chemical potentials, quantify the effect of $\mu\not=0$ on the equation of state, and comment on the complex phase of the fermion determinant in QCD with $\mu\not=0$.
Allton Chris R.
Ejiri Shinji
Hands Simon J.
Kaczmarek Olaf
Karsch Frithjof
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