A study of B [equation] meson oscillation using D [equation] -lepton correlations

摘要

From data collected around the Z resonance by the OPAL detector at LEP, a sample of B(_s^0) decays was obtained using D(_s^-}ell^+) combinations, where the (D_s^-) was fully reconstructed in the (phipi^-, mathrm{K}^{*0}mathrm{K}^-) and (mathrm{K}^0_{mathrm{S}}mathrm{K}^-) decay channels or partially reconstructed in the (phiell^-ar{ u}(mathrm{X})) decay channel. These events were used to study (mathrm{B_s^0}) oscillation. The flavor (b or (ar{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 4.1 ps(^{-1}). The experiment was not able to resolve the oscillatory behavior, and we deduced that the B(_s^0) oscillation frequency (Delta m_s > 1.0) ps(^{-1}) at the 95% confidence level.