2020 Impact factor 4.590
Particles and Fields

Eur. Phys. J. C 19, 241-256
DOI: 10.1007/s100520100591

A study of Bs0 meson oscillation using Ds--lepton correlations

The OPAL Collaboration G. Abbiendi and et al.

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

(Received: 7 November 2000 / Published online: 15 March 2001 -© Springer-Verlag 2001)

From data collected around the Z resonance by the OPAL detector at LEP, a sample of Bs0 decays was obtained using $\mathrm{D_s^-}\ell^+$ combinations, where the Ds- was fully reconstructed in the $\phi\pi^-$, K*0K- and K0SK- decay channels or partially reconstructed in the $\phi\ell^-\bar{\nu}(\mathrm{X})$ decay channel. These events were used to study Bs0 oscillation. The flavor (b or $\rm\bar{b}$) at decay was determined from the lepton charge while the flavor at production was determined from a combination of techniques. The expected sensitivity of the experiment is 4.1ps-1. The experiment was not able to resolve the oscillatory behavior, and we deduced that the Bs0 oscillation frequency $\Delta m_s > 1.0$ps-1 at the 95% confidence level.

© Società Italiana di Fisica, Springer-Verlag 2001