paper

Dynamical chiral symmetry breaking by a magnetic field and multi-quark interactions

arXiv:hep-ph/0701090 · doi:10.1016/j.physletb.2007.05.033

Abstract

Catalysis of dynamical symmetry breaking by a constant magnetic field in (3+1) dimensions is considered. We use the three flavour Nambu -- Jona-Lasinio type model with 't Hooft and eight-quark interaction terms. It is shown that the multi-quark interactions introduce new additional features to this phenomenon: (a) the local minimum of the effective potential catalyzed by the constant magnetic field is smoothed out with increasing strength of the field at the characteristic scale H~10^{19} G, (b) the multi-quark forces generate independently another local minimum associated with a larger dynamical fermion mass. This state may exist even for multi-quark interactions with a subcritical set of couplings, and is globally stable with respect to a further increase of the magnetic field.

6 pages, 3 figures, added discussion and references, version to appear in Phys.Lett.B

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