Global analysis of charm mixing parameters and determination of the CKM angle γ

2024/09/10 by F. Betti, Betti, F., M. Bóna +21 · 1 citation
Engineering · #Nuclear reactor physics and engineering

paper · pdf · doi:10.48550/arxiv.2409.06449

Abstract

We present an updated global analysis of beauty decays sensitive to the angle γ of the Cabibbo-Kobayashi-Maskawa matrix and of D-meson mixing data in the framework of approximate universality, in which CP violation in D-D mixing is described in terms of two universal weak phases corresponding to dispersive and absorptive contributions. We extract the fundamental theoretical parameters determining absorptive and dispersive contributions to D meson mixing and CP violation, together with the angle γ. The results for the charm mixing parameters are x₁₂ ≃ x = (0.401 ± 0.043)% and y₁₂ ≃ y = (0.610 ± 0.017)%, while the two CP-violating phases are given by ϕ₂^M = (0.13 ± 0.70)^∘ and ϕ₂^Γ = (2.1 ± 1.6)^∘. The angle γ is found to be γ= (65.7 ± 2.5)^∘, in excellent agreement with the indirect determination from the Unitarity Triangle analysis.

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