Status of the Standard Model


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The implications of recent precision Z‐pole, W mass, and weak neutral current data for testing the standard electroweak model, constraining that t quark and Higgs masses, αs (MZ), and grand unification are discussed. A fit to all data yields sin2θw(MZ)= 0.2325 ± 0.0024 (on‐shell), where the uncertainties are mainly from mt. In the standard model one predicts mt+17+15−23–17 GeV, where the central value assumes MH± 50 GeV (‐) or 1 TeV (+). In the minimal supersymmetric extension of the standard model (MSSM) one predicts mt= 138+20−25± 5 GeV, where the difference is due the light Higgs scalar expected in the MSSM. There is no significant constraint on MH until mt is known independently. Including perturbative estimates of the O(ααsm2t) corrections, these values increase by ∼ 5 GeV.

Original languageEnglish (US)
Pages (from-to)34-54
Number of pages21
JournalAnnals of the New York Academy of Sciences
Issue number1
StatePublished - Jun 1993

All Science Journal Classification (ASJC) codes

  • General Biochemistry, Genetics and Molecular Biology
  • General Neuroscience
  • History and Philosophy of Science


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