Dressed-Quark Anomalous Magnetic Moments

Lei Chang, Yu-Xin Liu, Craig D. Roberts
2011 Physical Review Letters  
Perturbation theory predicts that a massless fermion cannot possess a measurable magnetic moment. We explain, however, that the nonperturbative phenomenon of dynamical chiral symmetry breaking generates a momentum-dependent anomalous chromomagnetic moment for dressed light-quarks, which is large at infrared momenta; and demonstrate that consequently these same quarks also possess an anomalous electromagnetic moment with similar magnitude and opposite sign.
doi:10.1103/physrevlett.106.072001 pmid:21405508 fatcat:3bhs5w6mtzffpnfkvyuvynasfe