# The distinctions between $\mathrm{U}(1)$ and $\mathrm{SU}(3)$ massless bosons

The force carrier particles that mediate the electromagnetic, weak, and strong interactions are called gauge bosons. It is known that the gauge bosons in EM force and strong force are both massless.

A naive question is: why the force behaviors are so distinct from each other? That is --- there is confinement in strong interaction but not electromagnetism?

Can this question be explained without introducing the idea of renormalization group?

• The link in Yang-Mills being that the nonlinear term's coefficient in $D_\mu A_\nu$ is proportional to the gauge boson's self-interacting charge. – J.G. Dec 11 '17 at 16:26