Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2000-11-23
Nucl.Phys. B606 (2001) 322-336
Physics
High Energy Physics
High Energy Physics - Lattice
21 pages, 7 figures
Scientific paper
10.1016/S0550-3213(01)00232-2
We consider diquark condensation in finite density lattice SU(2). We first present an extension of Vafa-Witten result, on spontaneous breaking of vector-like global symmetries, that allows us to formulate a no-go theorem for diquark condensation in a region of the chemical potential-mass parameter space. We then describe a new technique to calculate diquark condensation at any number of flavours directly at zero external source without using any potentially dangerous extrapolation procedure. We apply it to the strong coupling limit and find compelling evidences for a second order phase transition, where a diquark condensate appears, as well as quantitative agreement between lattice results and low-energy effective Lagrangian calculations.
Aloisio Roberto
Azcoiti Vicente
Carlo Giuseppe Di
Galante Angelo
Grillo Aurelio F.
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