Measurements of the angle alpha (phi2) at B factories
G.Vasseur
TL;DR
This paper reviews measurements of the angle alpha (phi2) of the unitarity triangle at B factories, combining results from multiple decay modes by BABAR and Belle to determine its value.
Contribution
It provides a combined measurement of alpha using various decay channels from two major experiments, updating the current understanding of this unitarity triangle angle.
Findings
Alpha (phi2) measured as (87.5 +6.2 -5.3) degrees.
Results from B to pi pi, B to rho pi, and B to rho rho modes.
Consistent measurements from BABAR and Belle.
Abstract
The measurements of the angle alpha (phi2) of the unitarity triangle at the B factories are reviewed. The value of alpha determined by combining the results obtained in the B to pi pi, B to rho pi, and B to rho rho modes by both the BABAR and Belle experiments is (87.5 +6.2 -5.3) degrees.
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Taxonomy
TopicsNuclear Physics and Applications · Scientific Measurement and Uncertainty Evaluation · Magnetic confinement fusion research