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Search for $B^{0}_{s}$ oscillations using inclusive lepton events (1998)

Abstract
A search for Bs oscillations is performed using a sample of semileptonic b-hadron decays collected by the ALEPH experiment during 1991-1995. Compared to previous inclusive lepton analyses, the prop er time resolution and b-flavour mistag rate are significantly improved. Additional sensitivity to Bs mixing is obtained by identifying subsamples of events having a Bs purity which is higher than the average for the whole data sample. Unbinned maximum likelihood amplitude fits are performed to derive a lower limit of Dms>9.5 ps-1 at 95% CL. Combining with the ALEPH Ds based analyses yields Dms>9.6 ps-1 at 95% CL.

Publication details
Download http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=open-99-367
http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ep-98-117
http://cdsweb.cern.ch/record/360431/files/ep-98-117.pdf
http://cdsweb.cern.ch/record/360431/files/ep-98-117.ps.gz
http://cdsweb.cern.ch/record/360431/files/open-99-367.pdf
http://cdsweb.cern.ch/record/360431/files/open-99-367.ps.gz
Repository CERN Document Server (Switzerland)
Keywords Particle Physics - Experimental Results
Language eng