A Measurement of CP Violating Asymmetries in B0-->f0(980)K0s Decays

TL;DR

This paper reports preliminary measurements of CP-violating asymmetries in B0 decays to f0(980)K0s using data from the BaBar detector, providing insights into matter-antimatter differences.

Contribution

It presents the first measurement of CP asymmetries in B0→f0(980)K0s decays with a large data sample and detailed statistical analysis.

Findings

Measured CP violation parameters S and C with statistical and systematic uncertainties.

Indicated potential evidence of CP violation consistent with Standard Model expectations.

Provided data that can constrain theoretical models of CP violation in B meson decays.

Abstract

We present preliminary measurements of the CP-violating asymmetries in the decay $B^0\to f_0(980)(\to\pi^+\pi^{-}) K_s^0$. The results are obtained from a data sample of $209\times10^6$ $\Upsilon(4S) \to B\bar{B}$ decays collected with the BaBar detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. From a time-dependent maximum-likelihood fit we measure the mixing-induced CP violation parameter $S=-0.95^{+0.32}_{-0.23} \pm 0.10$ and the direct CP violation parameter $C=-0.24\pm 0.31 \pm 0.15 $, where the first errors are statistical and the second systematic.