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Measurement of the B_s oscillation frequency via B_s mixing analyses providesa powerful constraint on the CKM matrix elements. The study of B_d oscillationsis an important step towards B_s mixing and a preliminary measurement of Deltam_d has been made with ~250 pb^-1 of data collected with the upgraded Run II D0detector. Different flavor tagging algorithms have been developed and are beingoptimized for use on a large set of B_s mesons that have been reconstructed indifferent semileptonic decay modes.Comment: Poster presented at the XXIV Physics in Collisions Conference  (PIC04), Boston, USA, June 2004, 4 pages, LaTeX, 2 eps figure

Bd MIXING AND PROSPECTS FOR Bs MIXING AT DØ

B_d MIXING AND PROSPECTS FOR B_s MIXING AT DØ