An Updated Study of B Meson Oscillations using Dilepton Events
The OPAL Collaboration, K. Ackerstaff et al
Abstract
This paper reports a study of B meson oscillations using hadronic Z0 decays with two identified leptons, and updates a previous publication by including data collected in 1994. Decay times are reconstructed for each of the semileptonic B decays by forming vertices which include the lepton and by estimating the B meson momentum. The mass difference, Delta(md), between the two mass eigenstates in the B0d system is measured to be 0.430 +/- 0.043 + 0.028 - 0.030 ps-1, where the first error is statistical and the second error is systematic. For the B0s system, a lower limit of Delta(ms) > 2.2 ps-1 is obtained at 95% C.L.
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