An updated study of B meson oscillations using dilepton events

• DOI: 10.1007/s002880050565
• Publication Date: 2002-08-25T04:03:26Z
• Authors: K. Ackerstaff et al.
• Keywords: B meson; Momentum (technical analysis); Semileptonic decay; D meson

18 pages, LaTeX, 5 eps figures included, submitted to Zeit. f. Physik<br/>This paper reports a study of B meson oscillations using hadronic Z^0 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(m_d), between the two mass eigenstates in the B^0_d 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 B^0_s system, a lower limit of Delta(m_s) > 2.2 ps^-1 is obtained at 95% C.L.<br/>