Explaining B \to K pi anomaly with non-universal Z' boson

TL;DR

This paper investigates how a non-universal Z' boson can explain anomalies observed in B meson decay modes to K pi, which deviate from Standard Model predictions, providing a potential new physics explanation.

Contribution

The study demonstrates that a non-universal Z' boson model can account for the discrepancies in B to K pi decay observables, offering a novel explanation for these anomalies.

Findings

The Z' model explains the lower measured $S_{\pi^0 K^0}$ compared to $\sin 2 \beta$.

The model accounts for the larger observed $\Delta A_{CP}(K \pi)$.

Standard Model predictions are insufficient to explain the anomalies.

Abstract

We study the effect of non-universal $Z'$ boson in the decay modes $B \to K \pi$. In the standard model these modes receive dominant contributions from $b \to s$ QCD penguins. Therefore, in this limit one expects $S_{\pi^0 K^0} \approx \sin 2 \beta $, $A_{\pi^0 K^0} \approx 0$ and $A_{\pi^0 K^-} \approx A_{\pi^+ K^-}$. The corrections due to the presence of small non-penguin contributions is found to yield $S_{\pi^0 K^0} > \sin 2 \beta $ and $\Delta A_{CP}(K \pi) \simeq 2.5 %$. However, the measured value of $S_{\pi^0 K^0}$ is less than $ \sin 2 \beta $ and $\Delta A_{CP}(K \pi) \simeq 15 %$. We show the model with a non-universal $Z'$ boson can successfully explain these anomalies.