Constraining gamma from K* pi and rho K Decays

TL;DR

This paper demonstrates how to extract the weak phase gamma from K* pi and rho K decays, reducing hadronic uncertainties and providing tools to detect potential new physics in Delta I = 1 transitions.

Contribution

It introduces a method to determine gamma using combined decay observables and identifies approximate relations to probe new physics contributions.

Findings

Gamma can be extracted with reduced hadronic uncertainties.

Approximate relations help identify new physics in Delta I = 1 transitions.

Method enhances understanding of weak phase and potential new physics signals.

Abstract

We show that information on the weak phase gamma can be extracted from the K* pi and rho K decays. Less hadronic uncertainty is involved when the observables of four of these modes are combined together. We further point out two approximate relations in these decay modes can help determine whether there are new physics contributions in Delta I = 1 transitions, as hinted in the K pi modes.