Measurement of CP-Violating Asymmetries in B0->D(*)+D-

TL;DR

This paper reports updated measurements of CP-violating asymmetries in specific B meson decays using a large data sample from the BaBar detector, providing insights into matter-antimatter asymmetry.

Contribution

The study provides the most recent measurements of CP asymmetries in B0 decays to D(*)±D∓ and D+D−, with improved precision and detailed analysis of time-dependent parameters.

Findings

Measured time-integrated CP asymmetry ${ m A}_{D^{*±}D^{∓}}=0.12\u00b1 0.06\u00b1 0.02.

Determined time-dependent asymmetry parameters with specific values for each decay mode.

Results are consistent with the Standard Model predictions within uncertainties.

Abstract

We present updated measurements of \CP-violating asymmetries in the decays $\Bz\to\Dstarpm\Dmp$ and $\Bz\to\Dp\Dm$ using $(383\pm 4) \times 10^{6} \BB$ pairs collected by the \babar detector at the PEP-II $B$ factory. We determine the time-integrated \CP asymmetry ${\mathcal{A}}_{\Dstarpm\Dmp}=0.12\pm 0.06\pm 0.02$, and the time-dependent asymmetry parameters to be $C_{\Dstarp\Dm} =0.18\pm 0.15\pm 0.04$, $S_{\Dstarp\Dm}=-0.79\pm 0.21\pm 0.06$, $C_{\Dstarm\Dp} =0.23\pm 0.15\pm 0.04$, $S_{\Dstarm\Dp} =-0.44\pm 0.22\pm 0.06$, $C_{\Dp\Dm} =0.11\pm 0.22\pm 0.07$, and $S_{\Dp\Dm} =-0.54\pm 0.34\pm 0.06$, where the first uncertainty is statistical and the second is systematic.