The time dependence of Bd0-B̄d0 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 Δmd = 0.446 ± 0.032 ps-1.

Buskulic, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1997). Improved measurement of the Bd0-B̄d0 oscillation frequency. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 75(3), 397-407 [10.1007/s002880050483].

Improved measurement of the Bd0-B̄d0 oscillation frequency

CARPINELLI, Massimo;
1997

Abstract

The time dependence of Bd0-B̄d0 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 Δmd = 0.446 ± 0.032 ps-1.
Articolo in rivista - Articolo scientifico
Physics
English
397
407
11
Buskulic, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1997). Improved measurement of the Bd0-B̄d0 oscillation frequency. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 75(3), 397-407 [10.1007/s002880050483].
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