Constraints on the phase $\gamma$ and new physics from $B\to K\pi$ Decays

TL;DR

This paper explores how measurements of $B o K o ext{pi}$ decays can reveal potential new physics affecting electroweak penguin interactions, especially through anomalous gauge couplings, and how these can alter the phase $ ext{gamma}$.

Contribution

It demonstrates that the phase $3 ext{gamma}$ extracted from $B o K o ext{pi}$ decays is sensitive to new physics at loop level, providing a novel method to probe such effects.

Findings

$3 ext{gamma}$ measurements can significantly differ from Standard Model predictions due to new physics.

Anomalous gauge couplings can alter the extraction of $3 ext{gamma}$ from $B o K o ext{pi}$ decays.

The method offers a powerful way to detect new physics in electroweak penguin interactions.

Abstract

Recent results from CLEO on $B\to K\pi$ indicate that the phase $\gamma$ may be substantially different from that obtained from other fit to the KM matrix elements in the Standard Model. We show that $\gamma$ extracted using $B\to K\pi, \pi\pi$ is sensitive to new physics occurring at loop level. It provides a powerful method to probe new physics in electroweak penguin interactions. Using effects due to anomalous gauge couplings as an example, we show that within the allowed ranges for these couplings information about $\gamma$ obtained from $B\to K \pi, \pi\pi$ can be very different from the Standard Model prediction.