W Boson

This particle is the carrier for the Weak force. There are two kinds of W bosons: one which has positive electric charge and one which has negative electric charge.

Weak Force

This is one of the fundamental forces in nature and is mostly responsible for some of what we know as radioactivity. The particles that carry the weak force are the W and Z bosons. This force acts over short distances, so particles that are far apart are not affected by this force. Far in the subatomic world means separated by more than about the diameter of an atomic nucleus.