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

The OPAL Collaboration G. Abbiendi; et al.

doi:doi:10.1007/s100520100591

EPJ

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2024 Impact factor 4.8

Particles and Fields

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

A study of B_s⁰ meson oscillation using D_s^--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)

Abstract
From data collected around the Z resonance by the OPAL detector at LEP, a sample of B_s⁰ decays was obtained using $\mathrm{D_s^-}\ell^+$ combinations, where the D_s^- was fully reconstructed in the $\phi\pi^-$ , K^*0K^- and K⁰_SK^- decay channels or partially reconstructed in the $\phi\ell^-\bar{\nu}(\mathrm{X})$ decay channel. These events were used to study B_s⁰ 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 B_s⁰ oscillation frequency $\Delta m_s > 1.0$ ps^-1 at the 95% confidence level.