Implications for CP asymmetries of improved data on $B \to K^0 \pi^0$

TL;DR

This paper analyzes how improved data on the decay $B^0 o K^0 o ext{pi}^0$ can reveal potential new physics by examining CP asymmetries and their deviations from Standard Model predictions, considering small non-penguin effects.

Contribution

It provides updated predictions for CP asymmetry coefficients and discusses the sensitivity of these predictions to experimental measurements, enhancing tests of the Standard Model.

Findings

Updated prediction $ ext{C}_{K^0 ext{pi}^0} = 0.15 \u00b1 0.04$

Sensitivity of $ ext{S}_{K^0 ext{pi}^0} \u2268 1$ to branching ratios

Corrections to CP asymmetries calculated using isospin relations and experimental strong phases

Abstract

The decay $B^0 \to K^0 \pi^0$, dominated by a $b \to s$ penguin amplitude, holds the potential for exhibiting new physics in this amplitude. In the pure QCD penguin limit one expects $\ckp = 0$ and $\skp = \sin 2 \beta$ for the coefficients of $\cos \Delta m t$ and $\sin \Delta m t$ in the time-dependent CP asymmetry. Small non-penguin contributions lead to corrections to these expressions which are calculated in terms of isospin-related $B\to K\pi$ rates and asymmetries, using information about strong phases from experiment. We study the prospects for incisive tests of the Standard Model through examination of these corrections. We update a prediction $\ckp=0.15\pm 0.04$, pointing out the sensitivity of a prediction $\skp\approx 1$ to the measured branching ratio for $B^0\to K^0\pi^0$ and to other observables.