Measurement of the B(d)0 oscillation frequency using kaons, leptons and jet charge

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1996) Zeitschrift für Physik. C, Particles and fields — Vol. 72, n° 1, p. 17-30 (1996)

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Abstract
A measurement of the mass difference,Δm d , between the two physical B d 0 states has been obtained from the analysis of the impact parameter distribution of a lepton emitted at large transverse momentum (p t ) relative to the jet axis and from the analysis of the flight distance distribution of secondary vertices tagged by either a highp t lepton or an identified kaon. In the opposite hemisphere of the event, the charge of the initial quark has been evaluated using a highp t lepton, a charged kaon or the mean jet charge. With 1.7 million hadronic Z0 decays recorded by DELPHI between 1991 and 1993,Δm d is found to be: Δmd=0.531+0.050−0.046(stat.)±0.078(syst.)ps−1.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1996). Measurement of the B(d)0 oscillation frequency using kaons, leptons and jet charge. Zeitschrift für Physik. C, Particles and fields, 72(1), 17-30. https://doi.org/10.1007/s002880050219 (Original work published 1996)