2003/03/22 by The DELPHI Collaboration, J. Abdallah
Physics and Astronomy · #hep-ex
published as Eur.Phys.J. C28 (2003) 155-173 · 37 pages, 15 figures, Accepted by Eur. Phys. J. C
arxiv created 2003/03/22 · arxiv updated 2009/11/30
Neutral B meson oscillations in the B0s - anti-B0s and B0d - anti-B0d systems were studied using a sample of about 4.0 million hadronic Z decays recorded by the DELPHI detector between 1992 and 2000. Events with a high transverse momentum lepton were removed and a sample of 770 k events with an inclusively reconstructed vertex was selected. The mass difference between the two physical states in the B0d - anti-B0d system was measured to be: Δmd = (0.531 +/- 0.025 (stat.) +/- 0.007 (syst.)) ps-1. The following limit on the width difference of these states was also obtained: |ΔΓBd| / ΓBd < 0.18 at 95% CL. As no evidence for B0s - anti-B0s oscillations was found, a limit on the mass difference of the two physical states was given: Δms > 5.0 ps-1 at 95% CL. The corresponding sensitivity of this analysis is equal to 6.6 ps-1.