In recent years, some papers discussed the problems concerning massive gluons. Ref. [2] suggests that gluons acquire masses in order to improve QCD predictions at low energies. Ref. [3] assumes that the gluon mass is ...
Quark confinement is now one of the most interesting problems in particle physics. It is conjectured that the strict colour SU(3) local gauge symmetry of the QCD Lagrangian may lead to confinement. If this symmetry is...