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Article
Report number CERN-EP-98-028 ; CERN-L3-142
Title Measurement of the Bd0B¯d0 oscillation frequency
Author(s) L3 Collaboration  Mostrar todos los 441 autores
Affiliation (CERN)
Publication 1998
Imprint 19 Feb 1998
Number of pages 18
In: Eur. Phys. J. C 5 (1998) 195-203
DOI 10.1007/s100520050262
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; L3
Abstract Time-dependent B0-B¯0 mixing is studied using about two million hadronic Z decays registered by L3 in 1994 and 1995. For this study three techniques are used. Tagging of the b-quark charge at decay time is performed by identifying leptons from semileptonic B decays. The flavour of the b quark at production time is determined from the charge of the lepton in the opposite hemisphere or by using a jet-charge technique. The proper time of the B-particle decay is obtained by reconstructing the production and decay vertices or by a measurement of the lepton impact parameter. The combined result for the frequency of Bd0 meson oscillations is \begin{displaymath} {\Delta m_d} = 0.444 \pm 0.040 \ \mathrm{ps}^{-1}. \end{displaymath} \end{abstract} \end{document}

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