Time-Dependent CP-Violating Asymmetries in b -> s qbar q Transitions

TL;DR

This paper reports new measurements of CP-violation parameters in various B0 decay modes, using a large data sample, and finds a slight deviation from Standard Model predictions, contributing to understanding matter-antimatter asymmetry.

Contribution

It provides the first comprehensive set of CP-violation measurements across multiple B0 decay channels with a large data sample at Belle.

Findings

Combined results differ from SM by 2.4 standard deviations.

Measured CP-violation parameters for multiple decay modes.

Enhanced understanding of CP violation in B meson decays.

Abstract

We present new measurements of CP-violation parameters in B0 -> phiK0, K+K-Ks, f0(980)Ks, eta'Ks, omegaKs and Kspi0 decays based on a sample of 275 x 10^6 BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. One neutral B meson is fully reconstructed in one of the specified decay channels, and the flavor of the accompanying B meson is identified from its decay products. CP-violation parameters for each of the decay modes are obtained from the asymmetries in the distributions of the proper-time intervals between the two B decays. The combined result for the B0->phiK0, K+K-Ks, f0(980)Ks, eta'Ks, omegaKs, Kspi0, and previously reported KsKsKs decays differs from the SM expectation by 2.4 standard deviations.