590
K. Kleinknecht and U. Uwer
Fig. 9.27 Distributions of time difference t of the two neutral B mesons for (a) oppositesign and (b) same-sign dilepton events; (c) asymmetry between opposite- and same-sign dilepton
events. Points are data and the lines correspond to result of a fit. Figure taken from [83]
as well as the mixing asymmetry A meas ((t). The fit to the data resulted in a value
of m d = (0.493 ± 0.012 ± 0.009) ps −1 [83]
The most precise determination of m d at the B-factories was performed by
Belle analyzing simultaneously semi-leptonic decays B 0 → D ∗− ν and a set of
four different hadronic decays in a data sample of 140 fb
−1 and resulting into the
value m d = (0.511 ± 0.005 ± 0.006) ps −1 [84]. The various m d measurements
at the B-factories have been averaged [87] to
m d = (0.509 ± 0.003 ± 0.003) ps
−1 .
LHCb has performed a mixing measurement using fully reconstructed hadronic final
states as well as semi-leptonic decays. The most precise LHCb measurement was
performed using semi-leptonic B 0 decays. A total of 1.923×10 6 B 0 → D − μ + ν μ X
K. Kleinknecht and U. Uwer
Fig. 9.27 Distributions of time difference t of the two neutral B mesons for (a) oppositesign and (b) same-sign dilepton events; (c) asymmetry between opposite- and same-sign dilepton
events. Points are data and the lines correspond to result of a fit. Figure taken from [83]
as well as the mixing asymmetry A meas ((t). The fit to the data resulted in a value
of m d = (0.493 ± 0.012 ± 0.009) ps −1 [83]
The most precise determination of m d at the B-factories was performed by
Belle analyzing simultaneously semi-leptonic decays B 0 → D ∗− ν and a set of
four different hadronic decays in a data sample of 140 fb
−1 and resulting into the
value m d = (0.511 ± 0.005 ± 0.006) ps −1 [84]. The various m d measurements
at the B-factories have been averaged [87] to
m d = (0.509 ± 0.003 ± 0.003) ps
−1 .
LHCb has performed a mixing measurement using fully reconstructed hadronic final
states as well as semi-leptonic decays. The most precise LHCb measurement was
performed using semi-leptonic B 0 decays. A total of 1.923×10 6 B 0 → D − μ + ν μ X