Measurements related to CKM angle alpha in BABAR

Abstract

The BABAR collaboration measurements of the B -> pipi, B -> rhopi and B -> rhorho decays are presented. New results, from a 113 fb-1 data sample, on the time-dependent CP asymmetries of the longitudinally polarized component of the B0 -> rho+rho- channel are S_{rhorho,long}=-0.19 +/- 0.33 +/- 0.11 and C_{rhorho,long}=-0.23 +/- 0.24 +/- 0.14. Constraints on the Unitarity Triangle angle alpha from the pipi and the rhorho systems are derived.

arXiv commentTalk given at 39th Rencontres de Moriond on Electroweak Interactions and Unified Theories, 21-28 March 2004, La Thuile, Aosta Valley, Italy