Measurement of Time-Dependent CP Asymmetry in B0->ccbar K(*)0 Decays

TL;DR

This paper reports precise measurements of time-dependent CP asymmetries in neutral B meson decays involving charmonium, using a large data sample from the BaBar experiment, to test the Standard Model predictions.

Contribution

It provides updated and more precise measurements of CP asymmetry parameters in B decays with charmonium, improving upon previous results with a large data set.

Findings

Measured CP asymmetry parameters with reduced uncertainties.

Confirmed consistency with Standard Model predictions.

Enhanced understanding of CP violation in B meson decays.

Abstract

We present updated measurements of time-dependent CP asymmetries in fully reconstructed neutral B decays containing a charmonium meson. The measurements reported here use a data sample of (465+/-5) million Upsilon(4S)->BBbar decays collected with the Babar detector at the PEPII asymmetric energy e+e- storage rings operating at the SLAC National Accelerator Laboratory. The time-dependent CP asymmetry parameters measured from JpsiKs, JpsiKL, Psi(2S)Ks, Chi_c1Ks, eta_cKs and JpsiK*0 decays are: C_f = 0.024+/-0.020(stat)+/-0.016(syst) and -\eta_f S_f = 0.687+/-0.028(stat)+/-0.012(syst).