CP violation in B meson decays

Abstract

Recent CP asymmetry measurements in tree-dominated processes, $B^0\to {\pi }^{+}{\pi }^{-},{\rho }^{+}{\rho }^{-},{\rho }^{\pm }{\pi }^{\mp },B^{+}\to D{K}^{+}$, and in penguin-dominated decays, $B\to {\pi }^0{K}_S,{\eta }^{\prime }{K}_S,\varphi K_S$, are interpreted in the framework of the Kobayashi-Maskawa (KM) mechanism of CP violation. The KM phase emerges as the dominant source of CP violation in tree-dominated decays, which are beginning to constrain the unitarity triangle beyond other constraints. Improving precision of CP asymmetry measurements in penguin-dominated decays may indicate the need for new physics.

Comments: Talk presented at the Sixth International Conference on Hyperons, Charm and Beauty Hadrons, IIT, Chicago, June 27--July 3 2004