Search for B0s oscillations using inclusive lepton events

Details Search for B0s oscillations using inclusive lepton events Search for B0s oscillations using inclusive lepton events

1998-11-11

arxiv.org/abs/hep-ex/9811018v1

Eur.Phys.J.C7:553-569,1999

Physics

High Energy Physics

High Energy Physics - Experiment

23 pages, 10 figures

Scientific paper

10.1007/s100529901108

A search for B0s 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 proper time resolution and b-flavour mistag rate are significantly improved. Additional sensitivity to B0s mixing is obtained by identifying subsamples of events having a B0s 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 Deltam_s>9.5ps^-1 at 95% CL. Combining with the ALEPH D-s based analyses yields Deltam_s>9.6ps^-1 at 95% CL.

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