The time dependence of B-d(0)(B) over bar(d)(0) oscillations is measured by the ALEPH experiment at LEP, using three techniques; two of which are updates of previous measurements. In all cases the charge of the decaying b quark and its decay time are measured in one hemisphere of the event; the quark charge at production is tagged mainly using the opposite hemisphere. The first method uses the charge correlation between a D*(-) and a lepton in the opposite hemisphere; if no lepton is present, the produced quark charge is determined from the hemisphere charges. In the second method, the decay time is measured using a lepton in one hemisphere and the initial state is inferred from the opposite-hemisphere jet charge. The third method uses a lepton in each hemisphere. The data used were collected from 1991 to 1994. The combined result is Deltam(d)=0.446+/-0.032 ps(-1).
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|Titolo:||Improved measurement of the B-d(0)-(B)over-bar(d)(0) oscillation frequency|
|Citazione:||D., B., I., D., D., D., P., G., C., G., J. P., L., et al. (1997). Improved measurement of the B-d(0)-(B)over-bar(d)(0) oscillation frequency. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 75, 397-407.|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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