Speaker
Dr
Fabio Braghin
(Federal University of Goias)
Description
Sixth order quark-antiquark interactions are derived by starting from a quark-antiquark interaction mediated by one (nonperturbative) gluon exchange. Vacuum polarization gives rise to such UA(1) symmetry breaking interactions for different Lorentz and flavor structures, among which interactions with the same shape as the 't Hooft interactions induced by instantons. Some phenomenological consequences are discussed, in the local limit of these interactions, in terms of corrections to the parameters of the Nambu-Jona-Lasinio model.
Author
Dr
Fabio Braghin
(Federal University of Goias)
