EPJ

2022 Impact factor 4.4
EPJ C - Particles and Fields
Particles and Fields
Eur. Phys. J. C 11, 587-598
DOI 10.1007/s100529900206

A study of Bs0 meson oscillation using hadronic Z0 decays containing leptons

The OPAL Collaboration

G.Abbiendi$^{\rm 2}$ - et al.

2 Dipartimento di Fisica dell' Università di Bologna and INFN, 40126 Bologna, Italy

Received: 21 June 1999 / Published online: 28 September 1999

Abstract
A sample of Z0 decays containing b-flavoured hadrons is tagged using leptons, and events having precise proper time measurements are selected. These events are used to study Bs0 oscillations. The flavour (b or $\rm\bar{b}$) at decay is determined from the lepton charge while the flavour at production is determined from jet charge or the charge of a second lepton, where available. The experiment was not able to resolve the oscillatory behaviour, and we deduce that the Bs0 oscillation frequency $\Delta m_{\mathrm{s}}> 5.2$ ps-1 at the 95% confidence level.

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