Measurement of Time-Dependent CP-Violating Asymmetries in B0 Meson Decays to eta' K0

TL;DR

This paper reports a preliminary measurement of CP-violating parameters in B0 meson decays to eta' K0, using data from the BaBar detector, providing insights into matter-antimatter asymmetry.

Contribution

It presents the first measurement of CP-violation parameters S and C in B0 to eta' K0 decays using a large dataset from BaBar, advancing understanding of CP violation in these processes.

Findings

Measured S = 0.27 +/- 0.14 (stat) +/- 0.03 (syst)

Measured C = -0.21 +/- 0.10 (stat) +/- 0.03 (syst)

Data sample of 227 million B-Bbar pairs

Abstract

We present a preliminary measurement of CP-violating parameters S and C from fits of the time-dependence of B0 meson decays to eta' K0. The data were recorded with the BaBar detector at PEP-II and correspond to 227 * 10^6 B-Bbar pairs produced in e+e- annihilation through the Upsilon(4S) resonance. From a maximum likelihood fit we measure the CP-violation parameters S = 0.27 +/- 0.14 (stat) +/- 0.03 (syst) and C = -0.21 +/- 0.10 (stat) +/- 0.03 (syst).