Measurement of the ${\rm\bf B_{\bf d}^{\bf 0}- {\bf \bar{B}}_{\bf d}^{\bf 0}}$ oscillation frequency

M. Acciarri et al.
1998 European Physical Journal C: Particles and Fields  
Time-dependent B 0 -B 0 mixing is studied using about two million hadronic Z decays registered by L3 in 1994 and 1995. For this study three techniques are used. Tagging of the b-quark charge at decay time is performed by identifying leptons from semileptonic B decays. The flavour of the b quark at production time is determined from the charge of the lepton in the opposite hemisphere or by using a jet-charge technique. The proper time of the B-particle decay is obtained by reconstructing the
more » ... uction and decay vertices or by a measurement of the lepton impact parameter. The combined result for the frequency of B 0 d meson oscillations is The L3 Collaboration: Measurement of the B 0 d −B 0 d oscillation frequency 197
doi:10.1007/s100529800901 fatcat:bg6adfwy6fe3bfvvxd6tp5tyqe