Measurement of CP Asymmetries at BELLE

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 $B^0\to J/\psi K_S^0$, as well as time dependent CP asymmetries in rarer modes such as $B^0\to {\pi }^{+}{\pi }^{-},{\eta }^{\prime }{K}_S^0$ and $\varphi K_S^0$. I summarise the prospects for improving the precision on these and related measurements.

Invited talk at the SLAC Summer Institute Topical Conference, August 2002, (SSI02-TW02), 26 pages, LaTex, 24 EPS figures

References in corpus (1)

• Strong and Weak Phases from Time-Dependent Measurements of $B\to \pi \pi$