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Indications for an extra neutral gauge boson in electroweak precision data

Erler1, Langacker

  • 1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6396, USA.

Physical Review Letters
|October 4, 2000
PubMed
Summary

New analysis of Z decays suggests an extra Z

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Cosmology

Background:

  • Analysis of hadronic peak cross section at LEP 1 indicates missing invisible width in Z decays.
  • Recent atomic parity violation measurements yield effective weak charge with 0.6% accuracy, suggesting a negative S parameter.

Purpose of the Study:

  • To investigate the implications of new Z decay data.
  • To explore the existence and properties of an extra Z' boson.
  • To perform a model-independent determination of Z' boson couplings.

Main Methods:

  • Analysis of the hadronic peak cross section at LEP 1.
  • Utilizing atomic parity violation data to determine the effective weak charge.
  • Studying arbitrary extra Z' bosons and their couplings.

Main Results:

  • A small missing invisible width in Z decays was observed.
  • A significantly negative S parameter was indicated by atomic parity violation data.
  • The data are well-described by the presence of an extra Z' boson, potentially from grand unified theories.
  • An excellent fit was achieved when studying an arbitrary extra Z' boson, suggesting a family nonuniversal Z' similar to those in superstring theories.

Conclusions:

  • The presence of an extra Z' boson is strongly supported by current experimental data.
  • Model-independent analysis allows for detailed study and coupling determination of potential extra Z' bosons.
  • The findings align with predictions from certain grand unified and superstring theories, hinting at new physics beyond the Standard Model.

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