# Dissecting the $\Delta I= 1/2$ rule at large $N_c$

18 May 2020 Donini Andrea Hernández Pilar Pena Carlos Romero-López Fernando

We study the scaling of kaon decay amplitudes with the number of colours, $N_c$, in a theory with four degenerate flavours, $N_f=4$. In this scenario, two current-current operators, $Q^\pm$, mediate $\Delta S=1$ transitions, such as the two isospin amplitudes of non-leptonic kaon decays for $K\to (\pi\pi)_{I=0,2}$, $A_0$ and $A_2$... (read more)

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• HIGH ENERGY PHYSICS - LATTICE
• HIGH ENERGY PHYSICS - PHENOMENOLOGY