Charmless 2- and 3-body B decays and the angle alpha (phi2)

TL;DR

This paper reports measurements of branching fractions and CP asymmetries in charmless B decays, establishing new decay observations and constraining the CKM angle alpha using isospin and Dalitz plot analyses.

Contribution

It provides new measurements of charmless B decay modes and applies isospin and Dalitz analyses to constrain the CKM angle alpha.

Findings

Observation of B --> pi0 pi0 decay

Observation of B0 --> K0K0bar decay

Constraints on CKM angle alpha

Abstract

We present preliminary measurements of branching fractions and CP-asymmetry parameters in two- and three-body charmless hadronic B decays. The available data sample consists of 227 million Upsilon(4S) B decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We establish the observation of the decays B --> pi0 pi0 and B0 --> K0K0bar and constrain the CKM angle alpha with a full SU(2) isospin analysis in the B --> pi pi system and with a B0 --> pi+ pi- pi0 time-dependent Dalitz plot analysis.