Summary of Working Group 4: Mixing and mixing-related $CP$ violation in the $B$ system: $Δm$, $ΔΓ$, $ϕ_s$, $ϕ_{1}/β$, $ϕ_{2}/α$, $ϕ_{3}/γ$
This summary reviews contributions to the CKM 2021 workshop in Working Group 4. In particular, theoretical and experimental progress in determining $B$ meson mixing properties are discussed.
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