Search for B0s - anti-B0s oscillations in DELPHI using high-pt leptons
Abstract
Oscillations in the B0s - anti-B0s system were studied in events selected from about 4.3 million hadronic Z0 decays registered by DELPHI between 1992 and 2000. This paper presents updates of two published analyses ([11,12]). The first analysis, which utilizes leptons emitted with large momentum transverse to a jet, was improved by means of a better algorithm for the vertex reconstuction and a new algorithm for flavour-tagging at production time. The second analysis, which utilizes Ds-lepton events, was improved by optimizing the treatment of proper time resolution. No signal of B0s oscillations was observed and limits on the mass difference between the physical B0s states were obtained to be: ms > 8.0 ps-1 at the 95% C.L. with a sensitivity of ms = 9.1 ps-1 in the high pt lepton analysis and ms > 4.9 ps-1 at the 95% C.L. with a sensitivity of ms = 8.6 ps-1 in the Ds-lepton analysis. Previously published results on these analyses are superseed. The combination of these results with those obtained in other independent analyses previously performed in DELPHI (Ds-hadron, exclusive B0s, inclusive vertex) gives: ms > 8.5 ps-1 at the 95% C.L. with a sensitivity of ms = 12.0 ps-1.
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