Abstract
The possible role of the MSparameter sin 2 θ w(m z) in discussing physics at the Z° peak is outlined. A radiative correction Δ r ̂ (the analogue or Δr, which links directly sin 2 θ w(m> z) to m z , is introduced and evaluated in the standard model. Assuming 60 GeV × m t < 200 GeV, 10 GeV < m H < 1 TeV, employing Δ r ̂ and m z =91.12±0.16 GeV leads to an accurate determination sin 2 θ w(m z)=0.2328±0.0012±0.0022 (the first error is due to δm z and the second reflects the m t , m H uncertainty). It is interesting to note that this result is consistent with the simplest SUSY GUTs prediction. Accurate values for α i ( m z ) ( i=1,2) are also given. Constraints due to gauge invariance in defining effective weak interaction angles are discussed.
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