Improved Measurement of CP Asymmetries in B0 -> (ccbar)K0(*) Decays

TL;DR

This paper reports precise measurements of time-dependent CP asymmetries in neutral B meson decays to CP eigenstates, confirming the Standard Model prediction for sin2Beta with high statistical significance.

Contribution

It provides an improved measurement of sin2Beta using a large data sample, reducing uncertainties compared to previous results.

Findings

Measured sin2Beta = 0.722 +/- 0.040 (stat.) +/- 0.23 (syst.)

Results are consistent with Standard Model predictions

Large data sample enhances measurement precision

Abstract

We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 227 million Upsilon(4S) -> BBbar decays collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The amplitude of the CP asymmetry, sin2Beta in the Standard Model, is derived from decay-time distributions from events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other $B$ meson is determined to be either a B0 or B0bar from its decay products. We measure sin2Beta = 0.722 +/- 0.040 (stat.) +/- 0.23 (syst.) in agreement with the Standard Model expectation.