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

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

2008-12-10

arxiv.org/abs/0812.1842v1

Phys.Rev.D79:057902,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 3 figures

Scientific paper

10.1103/PhysRevD.79.057902

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.

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