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1. Weak Decay

   Linked via "QCD calculations"

   Non-Leptonic Decays
   Non-leptonic decays involve only hadrons in the final state (e.g., kaon decay $K^{+} \to \pi^{+} + \pi^{0}$). These are more complex due to the strong interaction's influence on the final state, requiring significant non-perturbative QCD calculations. The effective weak Hamiltonian for these decays is often written using the Operator Product Expansion (OPE) to manage the short-distance (weak) and long-dist…