From the data recorded with the DELPHI detector at LEP in the years 1991–1992, 46497 events were selected having a high-momentum muon in hadron jets. A fit to the average electric charge sum of the jets recoiling against a b-quark jet tagged by a high-PT muon results in an average mixing parameter of View the MathML source.
Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1994). Measurement of the B0 - anti-B0 mixing using the average electric charge of hadron jets in Z0 decays. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 322(4), 459-472. https://doi.org/10.1016/0370-2693(94)91178-9 (Original work published 1994)