Kaon Decays beyond the Standard Model

TL;DR

This paper introduces a novel method using interference effects in time-dependent $K\rightarrow \mu^+\mu^-$ decays to determine CKM parameters and explore physics beyond the Standard Model.

Contribution

It presents a new approach to extract the CKM parameter $\bar{\eta}$ and a precision relation for phase-shift analysis in kaon decays, enhancing the discovery potential for new physics.

Findings

New method for $\bar{\eta}$ determination from decay interference

A precision relation for phase-shift in oscillations

Enhanced sensitivity to physics beyond the Standard Model

Abstract

We review a new method in order to determine the parameter $\bar{\eta}$ of the Cabibbo-Kobayashi-Maskawa matrix from $K\rightarrow \mu^+\mu^-$ decays, using interference effects in the time-dependent decay rate. Furthermore, we discuss a new precision relation for the phase-shift of the time-dependent oscillation. The new methodology enables the discovery potential of future time-dependent measurements of $K\rightarrow \mu^+\mu^-$ decays for physics beyond the Standard Model.