Springer LINK: The European Physical Journal C - Abstract Volume 5 Issue 2 (1998) pp 195-203

The European Physical Journal C

ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)

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Abstract Volume 5 Issue 2 (1998) pp 195-203
DOI 10.1007/s100529800901

experimental physics:
Measurement of the ${\rm\bf B_{\bf d}^{\bf 0}- {\bf \bar{B}}_{\bf d}^{\bf 0}}$ oscillation frequency

The L3 Collaboration , M. Acciarri et al. (27)

(27) INFN-Sezione di Milano, I-20133 Milan, Italy

Received: 20 February 1998 / Revised version: 23 March 1998 / Published online: 12 August 1998

Abstract. Time-dependent ${{\rm B^{0}}\mbox{-}\bar{{\rm B}}^{0}}$ 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 ${{\rm B_d^0}}$ meson oscillations is \[ \Delta m_d = 0.444 \pm 0.040 {\rm ps}^{-1}. \]

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The European Physical Journal C

experimental physics: Measurement of the ${\rm\bf B_{\bf d}^{\bf 0}- {\bf \bar{B}}_{\bf d}^{\bf 0}}$ oscillation frequency

experimental physics:
Measurement of the ${\rm\bf B_{\bf d}^{\bf 0}- {\bf \bar{B}}_{\bf d}^{\bf 0}}$ oscillation frequency