The Anomalous Magnetic Moment of Quarks
  In the case of massless current quarks we find that the breaking of chiral symmetry usually triggers the generation of an anomalous magnetic moment for the quarks. We show that the kernel of the Ward identity for the vector vertex yields an important contribution. We compute the anomalous magnetic moment in several quark models. The results show that it is hard to escape a measurable anomalous magnetic moment for the quarks in the case of spontaneous chiral symmetry breaking. 
Pedro J. de A. Bicudo, J. Emilio F. T. Ribeiro and Rui Fernandes