Melting the Diquark Condensate in Two-Color QCD: A Renormalization Group Analysis

Details Melting the Diquark Condensate in Two-Color QCD: A Renormalization Group Analysis Melting the Diquark Condensate in Two-Color QCD: A Renormalization Group Analysis

2002-10-31

arxiv.org/abs/hep-ph/0210447v2

Phys.Rev. D67 (2003) 034021

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 1 figure, revtex, reference added, version to appear in PRD

Scientific paper

10.1103/PhysRevD.67.034021

We use a Landau theory and the epsilon expansion to study the superfluid phase transition of two-color QCD at nonzero temperature, T, and baryonic chemical potential, mu. At low T, and for N_f flavors of massless quarks, the global SU(N_f) \times SU(N_f) \times U(1) symmetry is spontaneously broken by a diquark condensate down to Sp(N_f) \times Sp(N_f) for any mu > 0. As the temperature increases, the diquark condensate melts, and at sufficiently large T the symmetry is restored. Using renormalization group arguments, we find that in the presence of the chiral anomaly term there can be a second order phase transition when N_f=2 or N_f >= 6, while the transition is first order for N_f=4. We discuss the relevance of these results for the emergence of a tricritical point recently observed in lattice simulations.

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