Does there arise a significant enhancement of the dynamical quark mass in external magnetic field?

Abstract

Recently, it was found in QED that the generation of a dynamical electron mass in a strong magnetic field is significantly enhanced by the perturbative electron mass. In the present paper, the related question of a possible enhancement of the dynamical quark mass in an external magnetic field and with a bare mass term is investigated in the Nambu--Jona-Lasinio model.

Comments: 4 pages; Revtex4; new references added; version accepted for publication in Phys. Lett. B