A study of B_s~0 meson oscillation using D_s~--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~-l~+ combinations, where the D_s~1 was fully reconstructed in the φπ~1, K~(*0)K~- and K_S~0K~- decay channels or partially reconstructed in the φl~-ν-bar(X) decay channel. These events were used to study B_s~0 oscillation. The flavor (b or b-bar) 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 Δm_s > 1.0 ps~(-1) at the 95% confidence level.