TL;DR
This paper reports recent measurements of the CKM angle phi2/alpha from B meson decays at Belle and BaBar, combining multiple decay modes to constrain the angle with improved precision.
Contribution
It provides new experimental results on phi2/alpha using B->pi pi, B->rho rho, and B->rho pi decays, including combined constraints from two major experiments.
Findings
Constraint on phi2/alpha: 100.2+15.0-8.8 degrees
Analysis of B->pi pi, B->rho rho, B->rho pi decays
Combined experimental results from Belle and BaBar
Abstract
We report the recent phi2/alpha results from Belle with KEKB accelerator and Babar with PEP-II accelerator. The analysis of B->pi pi, B->rho rho and B->rho pi are included in this report. These b->u u_bar d decay modes are related to the CKM angle phi2/alpha and the method of phi2/alpha extraction of corresponding decay are also included. After combining all the decay modes, the constraint of phi2/alpha is 100.2+15.0-8.8 degree.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Particle accelerators and beam dynamics · Particle Accelerators and Free-Electron Lasers