Measurement of alpha/phi2 in Bo --> pi pi, rho pi and rho rho

TL;DR

This paper summarizes measurements of the CKM angle alpha (phi2) from B meson decays into pi pi, rho pi, and rho rho, using data from BaBar and Belle experiments to constrain the Standard Model's CP violation parameters.

Contribution

It compiles and analyzes the latest experimental results on alpha (phi2) from multiple decay channels, providing updated constraints on this key parameter.

Findings

Measured branching fractions and CP asymmetries in B decays.

Derived constraints on the CKM angle alpha (phi2).

Summarized experimental progress from BaBar and Belle.

Abstract

We present a summary of the measurements of the CKM angle, alpha (phi2), performed by the BaBar and Belle experiments which collect BBbar pairs at the Y(4S) resonance produced in asymmetric e+ e- collisions. We discuss the measurements of the branching fractions and CP asymmetries in the B --> pi pi, rho pi and rho rho final states that lead to constraints on alpha (phi2).