Il Nuovo Cimento A (1965-1970)

, Volume 107, Issue 10, pp 1959–1970 | Cite as

New results on electroweak b physics from LEP



Recent results from LEP on selected topics in electroweak physics involving-b quark events are reviewed. The LEP average value of the Z0 partial width to b-quarks is:\(\Gamma _{b\bar b} = 0.220 \pm 0.003\) giving the limit on the top-quark mass:mt<230 GeV/c2 (95% c.l.). The b-quark forward-backward asymmetry leads to a measurement of the effective Weinberg angle, sin2 θeff=0.2299±0.0017 and the semi-leptonic b-quark decay branching ratio is measured to be, BR (b→ℓ)=0.110±0.005. Results on time-averaged and time-dependent\(B^0 - \bar B^0 \) mixing are presented, the latter leading to a measurement of the mass difference of the B0 and\(\bar B^0 \) mesons: Δm=[3.44 −0.70 +0.65 (stat) −0.16 +0.22 (syst)]·10−4 eV.

PACS 13.25

Hadronic decays of mesons 

PACS 13.65

Hadron-production by electron-positron collisions 

PACS 01.30.Cc

Conference proceedings 


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Copyright information

© Società Italiana di Fisica 1994

Authors and Affiliations

  • J. Carr
    • 1
  1. 1.Centre de Physique de MarseilleIN2P3-CNRSMarseille, Cedex 09France

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