Summary of Working Group 4: Mixing and mixing-related $CP$ violation in the $B$ system: $\Delta m$, $\Delta \Gamma$, ${\varphi }_s$, ${\varphi }_1/\beta$, ${\varphi }_2/\alpha$, ${\varphi }_3/\gamma$

Veronika Chobanova, Matthew Wingate, Yosuke Yusa +12

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…