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Study of $B^0_s$ oscillations and lifetime using fully reconstructed $D^-_s$ decays (1998)

Abstract
A search for B0s oscillations is performed using approximately 4 million Z --> qqbar events collected by the ALEPH experiment during 1991-1995. B0s candidates are partially reconstructed by combining tracks with fully reconstructed Ds- candidates. The B0s production flavour is estimated from the sign of the opposite hemisphere charge, a fragmentation kaon in the same hemisphere, or a lepton in the opposite hemisphere. From a total sample of 1620 candidates, with a B0s purity estimated to be 22%, all values of Delta(m_s) below 3.9 ps-1 and between 6.5 and 8.8 ps-1 are excluded at 95% CL. From the same sample, the B0s lifetime is measured to be tau_s = 1.47 +- 0.14 (stat) +- 0.08 (syst) ps. This analysis selects mainly hadronic B0s decays and is statistically independent of a previous ALEPH analysis selecting B0s --> Ds(*)- l+ nu candidates. Combining these two analyses yields Delta(m_s) > 7.9 ps-1 at 95% CL and tau_s = 1.51 +- 0.11 ps.

Publication details
Download http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ppe-97-157
http://cdsweb.cern.ch/record/342545/files/ppe-97-157.pdf
http://cdsweb.cern.ch/record/342545/files/ppe-97-157.ps.gz
Repository CERN Document Server (Switzerland)
Keywords Particle Physics - Experimental Results
Language eng