Measurement of CP Asymmetries at BELLE

TL;DR

This paper reports on measurements of CP asymmetries in B meson decays at the Belle experiment, providing insights into CP violation and its implications for the Standard Model.

Contribution

It presents new measurements of CP violation parameters in various B decay modes using Belle data, and discusses future prospects for precision improvements.

Findings

Measured CP asymmetries in $B^0 o J/A ext{psi} K_S^0$

Analyzed time-dependent CP asymmetries in rare B decays

Summarized potential for future precision enhancements

Abstract

The Belle experiment at the KEK $B$ factory has collected 93 fb$^{-1}$ of electron positron collisions at $\sqrt s = 10.6$ GeV. This has produced a sample of 85 million $B {\bar B}$ meson pairs that can be used to study $CP$ violation in rare (and not so rare) B decay modes. Here I report on a measurement of indirect CP violation in the decay $B^0 \to J/\psi K^0_S$, as well as time dependent CP asymmetries in rarer modes such as $B^0 \to \pi^+ \pi^-, \eta' K_S^0$ and $\phi K^0_S$. I summarise the prospects for improving the precision on these and related measurements.