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V. Electroweak Precision Observables

V. Electroweak Precision Observables. What radiative corrections can teach us Basic formalism. g. g. Weak Decays: G F encodes information on the spectrum via radiative corrections. Muon Decay. D r m depends on parameters of particles inside loops. g. g.

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V. Electroweak Precision Observables

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  1. V. Electroweak Precision Observables • What radiative corrections can teach us • Basic formalism

  2. g g Weak Decays: GFencodes information on the spectrum via radiative corrections Muon Decay Drm depends on parameters of particles inside loops

  3. g g Comparingradiative corrections in different processes canprobeparticle spectrum Drm differs fromDrZ

  4. Comparingradiative corrections in different processes canprobeparticle spectrum

  5. Charged Current Interactions I G.B. Propagator Fermion Propagator Vertex Correction Box (finite)

  6. Muon decay at one loop: Muon lifetime: Vertex, box, fermion prop Fermi constant & r : Tree level Charged Current Interactions II

  7. Complication: Z mixing Neutral Current Interactions I G.B. Propagator Fermion Propagator Vertex Correction Box (finite)

  8. Normalize to G: Remove r Vertex & ext leg Neutral Current Interactions II Neutral current l+f --> l+f at one loop: Normalization: Vector & axial vector couplings: Weak mixing:

  9. The  parameter: Weak mixing: Can impose constraints from global fits to EWPO via S,T,U-dependence of these quantities Oblique Parameters I G.B. Propagators

  10. Oblique Parameters II Fit to electroweak precision observables: G.B. Propagators mH = 114.4 GeV Plus low-energy observables: atomic PV, PV electron scattering,  scattering…

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