2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38297$B^0$ mixing measurements from the Tevatron Run I data are reported. These include time-integrated measurements of the average mixing parameter $\barχ$, six time-dependent oscillation measurements of $Δm_d$, and a time-dependent limit on $Δm_s$. Such measurements provide constraints on CKM matrix elements. A sample of $B^0/\bar{B}{^0} \to J/ψK^0_S$ decays is used to directly measure the CP-violation parameter $\sin(2β)$. This value agrees well with indirect constraints on the CKM matrix.13th Topical Conference on Hadron Collider Physics 17 pagesHigh Energy Physics - Experimenttext