Measurement of the CKM angle phi2 (alpha)
A.Somov
TL;DR
This paper reports recent experimental measurements of the CKM angle phi2 (alpha) using various B meson decay modes, combining data from Belle and BaBar to refine understanding of CP violation in the quark sector.
Contribution
It provides new measurements of phi2 (alpha) from multiple decay channels and introduces a CP asymmetry measurement in B -> a_1+ pi- decay to better constrain the angle.
Findings
Measurements of phi2 (alpha) from B -> pi pi, rho rho, and rho pi decays.
New CP asymmetry measurement in B -> a_1+ pi- decay.
Enhanced constraints on the CKM unitarity triangle.
Abstract
We present recent measurements of the unitarity triangle angle phi2(alpha) using B -> pi pi, B -> rho rho, and B -> rho pi decays. The measurements are based on data samples collected with the Belle and BaBar detectors at the KEKB and PEP-II e+e- colliders, respectively. We also report on a new measurement of a CP-violating asymmetry in B -> a_1+ pi- decay which will allow to constrain further the angle phi2.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · Particle Accelerators and Free-Electron Lasers