Measurement of the Branching Fraction and the CP-Violating Asymmetry for the Decay B0 --> K0S Pi0

TL;DR

This paper reports a precise measurement of the branching fraction and CP-violating asymmetry in B0 to K0S pi0 decays, providing insights into CP violation in the B meson system.

Contribution

First measurement of these parameters using 227 million B meson pairs collected by BaBar at SLAC.

Findings

Branching fraction: (11.4 ± 0.9 ± 0.6) x 10^{-6}

CP asymmetry parameters: C = 0.06 ± 0.18 ± 0.03, S = 0.35^{+0.30}_{-0.33} ± 0.04

Results are consistent with Standard Model predictions.

Abstract

We measure the branching fraction and the CP-violating asymmetry of $B^{0}\to K_{s}^{0}\pi^{0}$ decays with 227 million $\Upsilon(4S)\to B\bar{B}$ events collected with the BaBar detector at the PEP-II asymmetric-energy $e^+e^-$ collider at SLAC. We obtain a branching fraction ${\cal B}(B^{0}\to K^{0}\pi^{0}) = (11.4 \pm 0.9 \pm 0.6) \times 10^{-6}$ and CP-violating asymmetry parameters $C_{K_{s}^{0}\pi^{0}} = 0.06 \pm 0.18 \pm 0.03$ and $S_{K_{s}^{0}\pi^{0}} = 0.35^{+0.30}_{-0.33} \pm 0.04$, where the first error is statistical and the second systematic.