Elsevier

Physics Letters B

Volume 309, Issues 3–4, 15 July 1993, Pages 451-462
Physics Letters B

Determination of the effective electroweak mixing angle from Z decays

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Abstract

The effective electroweak mixing angle sin2θw is measured from the production and decay of the Z boson in e+e interactions. The data sample corresponds to an integrated luminosity of 18pb−1 with about 420 000 hadronic and 40 000 leptonic Z decays. The mixing angle sin2θw is determined from several independent measurements: the leptonic and hadronic cross sections, the forward-backward asymmetries of charged leptons and b-quarks, and the τ-polarization. The results are found to be in good agreement with each other. The value of sin2θw from a fit to the asymmetries in a model independent method is 0.2321±0.0021 and from a global fit to the data in the Standard Model framework is 0.2328±0.0013.

References (15)

  • S.L. Glashow

    Nucl. Phys.

    (1961)
    S. Weinberg

    Phys. Rev. Lett.

    (1967)
    A. Salam
  • O. Adriani

    Phys. Lett. B

    (1992)
  • B. Adeva

    Nucl. Instrum. Methods A

    (1990)
  • M. Gell-Mann

    Acta Phys. Austriaca Suppl. IX

    (1972)
    H. Fritsch et al.H. Fritzsch et al.

    Phys. Lett. B

    (1973)
    D.J. Gross et al.

    Phys. Rev. Lett.

    (1973)
    D.J. Gross et al.

    Phys. Rev. D

    (1973)
    H.D. Politzer

    Phys. Rev. Lett.

    (1973)
    G. 't Hooft

    Nucl. Phys. B

    (1971)
  • B. Adeva

    Z. Phys. C

    (1991)
  • D. Decamp

    Z. Phys. C

    (1992)
    P. Abreu

    Nucl. Phys. B

    (1991)
    G. Alexander

    Z. Phys. C

    (1991)

    Phys. Lett. B

    (1992)
    LEP Energy

    Phys. Lett. B

    (1993)
  • O. Adriani

    CERN-PPE/93-31

    (February, 1993)
There are more references available in the full text version of this article.

Cited by (2)

  • Physics of tau leptons

    1996, Physics Report
1

Supported by the German Bundesministerium für Forschung und Technologie.

2

Supported by the Hungarian OTKA fund under contract number 2970.

3

Deceased.

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