Contribution to $\epsilon'/\epsilon$ from anomalous gauge couplings

TL;DR

This paper investigates how anomalous gauge couplings can significantly influence the CP violation parameter 5'/5, potentially aligning theoretical predictions more closely with recent experimental measurements.

Contribution

It introduces the impact of anomalous gauge couplings on 5'/5, showing they can enhance the value to match experimental data, which is a novel consideration.

Findings

Anomalous gauge couplings can significantly increase 5'/5 values.

Enhanced 5'/5 predictions align better with recent measurements.

Standard Model predictions are on the lower end of experimental range.

Abstract

Recently KTev collaboration has measured $Re(\epsilon'/\epsilon) = (28\pm 4.1) \times 10^{-4}$ which is in agreement with early measurement from NA31. The Standard Model prediction for $\epsilon'/\epsilon$ is on the lower end of the experimentally allowed range depending on models for hadronic matrix elements. In this paper we study the contributions from anomalous gauge couplings. We find that the contributions from anomalous couplings can be significant and can ehance $\epsilon'/\epsilon$ to have a value closer to data.