Measurements of direct CP violation

New Measurements of Direct Cp Violation

New Developments in Measurements of Cp Violation

With the discovery of CP violation in the decays of neutral B mesons 1 and the precise measurement 2 of the angle β of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle 3, the experimental focus at the B factories has shifted towards over-constraining the unitarity triangle through precise measurements of |Vub| and the angles α and γ, and towards measurements of CP asymmetry in the charmle...

Lessons from Recent Measurements of CP Violation

We discuss various implications of recent experimental results concerning CP violation and mixing in K → ππ, B → ψKS , D → Kπ and D → KK decays. 1. Progress in Experiments The study of CP violation is entering a new era. For a long period only a single CP violating observable has been measured [1]: |εK | = 2.27× 10. (1.1) In the near future, however, we will learn the values of CP asymmetries i...

Measurement of Direct Cp Violation by Na48

The NA48 experiment at the CERN SPS aims to search for direct CP /violation in the K system through the measurement of Re(ε/ε) with high accuracy. In 1999 the NA48 collaboration has published its first measurement based on 1997 data. The final result based on 1998 and 1999 data is presented in this article. The result, combined with 1997 data, Re(ε/ε) = (15.3 ± 2.6) × 10, definitely established...

Direct CP Violation in B Decays

We discuss several aspects of direct CP asymmetries in B decays, which are very useful in spite of hadronic uncertainties in asymmetry calculations. 1) Asymmetries in decays to D(∗)K(∗), π+π−, ρ+ρ−, providing precision tests for the CKM phase γ. 2) Null tests in B+ → J/ψK+, π+π0, where a nonzero asymmetry provides evidence for New Physics. 3) Isospin and broken flavor SU(3) relations among CP a...