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[en] Preliminary new measurements from L3 and ALEPH of the B0B-bar0 mixing parameter χ are presented. These results are based on the 1990 and 1991 data samples of more than 400 000 hadronic Z0 events for each experiment. High momentum leptons are used to select Z0 → bb-bar events and to tag the charges of the b-quarks. ALEPH has made a fit to the inclusive single-and di-lepton momentum spectra, to obtain χ=0.137±0.015(stat)±0.007(syst). Using the measurements of χd at the Υ(4S) resonance and those of χ from pp-bar colliders and LEP, a combined fit for the Bd0 and Bs0 mixing parameters χd and χs has been made. (author) 14 refs.; 4 figs.; 4 tabs
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Tran Thanh Van, J. (ed.); [578 p.]; ISBN 2-86332-118-8; 
; 1992; p. 365-372; Editions Frontieres; Paris (France); Moriond particle physics meeting; 27. Rencontre de Moriond; Les Arcs (France); 22-28 Mar 1992
; 1992; p. 365-372; Editions Frontieres; Paris (France); Moriond particle physics meeting; 27. Rencontre de Moriond; Les Arcs (France); 22-28 Mar 1992