... concept of electron.We can mean by this the electron of classical electrodynamics, of quantummechanics, or of quantum electrodynamics. To the extent we want to considerthem to be related to each ... contribution to the annihilation of an electronand a positron into a quark, an antiquark and a gluon is depicted. The fi-nal particles in the perturbative amplitude, the quark, antiquark, and gluoncannot ... content of the leptonic sector of the standard model consists of the three charged Dirac fields, namely those of the electron, the muon and the τ-lepton, and of the three chargeless fields of the...