$CP$ violation in neutral kaon mixing in $D^0\rightarrow K_SK_S$

TL;DR

This paper investigates CP violation effects from neutral kaon mixing in D0 decays to K_S K_S, finding the effect to be negligible at current experimental sensitivities.

Contribution

It provides a theoretical estimate showing the neutral kaon mixing contribution in D0 decays is at the 10^-6 level, which is negligible for current experiments.

Findings

Neutral kaon mixing contribution is at the 10^-6 level.

This effect is negligible compared to experimental sensitivity.

The study clarifies the role of second-order weak interactions in D decays.

Abstract

We study CP violation induced by neutral kaon mixing in $a_{CP}(D^0 \rightarrow K_S K_S)$. We show that the contribution from neutral kaon mixing arises only in connection with second-order weak interactions in $D$ decays. We estimate this effect to be at the $10^{-6}$ level, and thus negligible compared to current experimental sensitivity and to the expected contribution from CP violation in the charm sector.