2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/111215Measurement of the $B^0_s$ oscillation frequency via $B^0_s$ mixing analysis provides a powerful constraint on CKM matrix elements. This note briefly reviews the motivation behind these analyses and describes the various steps that go into a mixing measurement. Recent results on $B^0_s$ mixing obtained by the CDF and DØcollaborations using the data samples collected at Tevtron Collider in the period 2002 - 2005 are presented.4 pages, 4 figures, Presented at Moriond QCD 2006 conferenceHigh Energy Physics - Experimenttext