Isospin
= Isospin
{wiki}
Isospin is the approximate $SU(2)$ flavor symmetry rotating the up and down quarks. It is accurate because their masses are close and both are small compared with the QCD scale.
= Isospin
{wiki}
Isospin is the approximate $SU(2)$ flavor symmetry rotating the up and down quarks. It is accurate because their masses are close and both are small compared with the QCD scale.