New Measurements of Time-Dependent CP-Violating Asymmetries in B0 -> KsKsKs and Ks pi0 gamma Decays at Belle

TL;DR

This paper reports new measurements of CP-violation parameters in specific B0 decay modes using data from the Belle experiment, providing insights into matter-antimatter asymmetries.

Contribution

First measurements of CP-violation parameters in B0 -> KsKsKs and Ks pi0 gamma decays at Belle with a large data sample.

Findings

Measured CP-violation parameters with statistical and systematic uncertainties.

Results are consistent with Standard Model expectations within errors.

Preliminary results indicating potential for further precision studies.

Abstract

We present new measurements of CP-violation parameters in B0 -> KsKsKs and Ks pi0 gamma 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 are obtained from the asymmetries in the distributions of the proper-time intervals between the two B decays. We obtain S_{KsKsKs} = +1.26 +/- 0.68(stat) +/- 0.18(syst), A_{KsKsKs} = +0.54 +/- 0.34(stat) +/- 0.08(syst), S_{Ks pi0 gamma} = -0.58 +0.46/-0.38(stat) +/- 0.11(syst), A_{Ks pi0 gamma} = +0.03 +/- 0.34(stat) +/- 0.11(syst). All results are preliminary.