Penguin pollution estimates relevant for phi_2/alpha extraction

Abstract

A review of methods to extract the standard CKM unitarity triangle angle alpha is provided. The sizes of related theoretical errors are reviewed.

Comments: 6 pages, referencing improved, based on talks given at "CKM2006", Dec 12th-16th, 2006, Nagoya, Japan, and at "Beauty 2006", Sept 25th-29th 2006, Oxford, UK