Weak isospin

Weak isospin is a quantum number associated with the weak interaction, one of the four fundamental forces of nature responsible for processes like beta decay in atomic nuclei. It is a key concept in the electroweak theory, which unifies the electromagnetic force and the weak nuclear force. In the context of particle physics, weak isospin is analogous to the concept of isospin (or isotopic spin) used for strong interactions, but it is specifically related to the weak force.