Measurements related to CKM angle alpha in BABAR

TL;DR

This paper presents BABAR collaboration measurements of B meson decays to pions and rhos, providing new data on CP asymmetries and constraints on the CKM angle alpha, advancing understanding of CP violation in the quark sector.

Contribution

It reports new measurements of CP asymmetries in B decays and derives constraints on the CKM angle alpha from these decay modes.

Findings

Measured CP asymmetries in B0 -> rho+rho- decays.

Derived constraints on the CKM angle alpha.

Provided updated results from 113 fb-1 data sample.

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.