Chiral-symmetry breaking and pion structure in the Covariant Spectator   Theory
  We introduce a covariant approach in Minkowski space for the description of quarks and mesons that exhibits both chiral-symmetry breaking and confinement. In a simple model for the interquark interaction the quark mass function is obtained and used in the calculation of the pion form factor. We study the effects of the mass function and of the different quark pole contributions on the pion form factor. 
Elmar P. Biernat, M. T. Pe\~na, Franz Gross, Alfred Stadler, Em\'ilio   Ribeiro
hep-ph nucl-th