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Due to the mass difference between the $u$-quark and the $d$-quark, SU(2) isospin symmetry is only an approximate symmetry (even in a universe devoid of weak and EM interactions). This suggests to me that isospin violation is not impossible in strong interaction itself. But from what I know, this does not happen. Processes mediated by strong interactions are always found to conserve isospin. Why is this so?

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