, Volume 18, Issue 2, pp 229-252

Study of \({\mathrm B^0_s}-\overline{\mathrm B^0_s}\) oscillations and \({\mathrm B^0_s}\) lifetimes using hadronic decays of \({\mathrm B^0_s}\) mesons

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Abstract.

Oscillations of \(\mbox{B}^0_{\mathrm{s}}\) mesons have been studied in samples selected from about 3.5 million hadronic \(\mathrm{Z}\) decays detected by DELPHI between 1992 and 1995. One analysis uses events in the exclusive decay channels: \(\mathrm{B^0_s}\rightarrow \rm{D}_{s}^{-} \pi^{+}\) or \(\rm{D}_{s}^{-}\mathrm{a_1^+}\) and \(\mathrm{B^0_s} \rightarrow \overline{\mathrm{D}}^0\mathrm{K}^-\pi^+ \) or \(\overline{\mathrm{D}}^0\mathrm{K}^-\mathrm{a_1^+}\), where the \({\mathrm{D}}\) decays are completely reconstructed. In addition, \(\mbox{B}^0_{\mathrm{s}}-\overline{\mbox{B}^0_{\mathrm{s}}}\) oscillations have been studied in events with an exclusively reconstructed \({\mathrm{D_s}}\) accompanied in the same hemisphere by a high momentum hadron of opposite charge. Combining the two analyses, a limit on the mass difference between the physical \(\mbox{B}^0_{\mathrm{s}}\) states has been obtained:

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Using the latter sample of events, the \(\mathrm{B^0_s}\) lifetime has been measured and an upper limit on the decay width difference between the two physical \(\mathrm{B^0_s}\) states has been obtained:

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The combination of these results with those obtained using \({\rm{D}_{s}^{\pm}} \ell^{\mp}\) sample gives:

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