Data collected with the OPAL detector at LEP during 1990-1993 are used to measure the time dependence of Bd 0 ↔ Bd 0 mixing. From a sample of 153 ± 12 events with a charged D* and a lepton in the opposite hemisphere, we measure the Bd 0↔Bd 0 oscillation frequency to be Δmd = 0.57±0.11(stat.)±0.02(syst.) ps-1. This corresponds to an oscillation parameter of xd = ΔmdτBd 0 = 0.82±0.16(stat.) ± 0.03(syst.) ± 0.09(syst. τB0 d ), where the second systematic uncertainty is due to the error in the measured Bd 0 lifetime.
ASJC Scopus subject areas
- Nuclear and High Energy Physics