Vacuum polarization effects of new physics on electroweak processes

Altarelli, Guido; Barbieri, Riccardo

doi:10.1016/0370-2693(91)91378-9

Vacuum polarization effects of new physics on electroweak processes

Guido Altarelli
(
- CERN
)
,
Riccardo Barbieri
(
- Pisa U. and
- INFN, Pisa
)

Sep, 1990

7 pages

Published in:

Phys.Lett.B 253 (1991) 161-167

Published: 1991

DOI:

10.1016/0370-2693(91)91378-9

Report number:

CERN-TH-5863-90

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Abstract: (Elsevier)

The effects of new physics on vacuum polarization corrections to electroweak processes can in general be parametrized in terms of six real constants, in the limit of neglecting terms which vanish for Λ→∞, with Λ being the scale of new physics. Three of these parameters can be reabsorbed in the definitions of α , G F and m Z , while the remaining three are observables. On the basis of simple models, it is shown that all three can be important and should be kept in a model-independent analysis of the data. This is equivalent to treating Δr, Δϱ and s 2 w (an effective sin 2 θ w fro on-shell Z couplings) as independent observables. By now available data allow a separate model-independent determination of these quantities. Implications for technicolour and supersymmetric models and anomalous γWW or ZWW couplings are discussed.

electroweak interaction: rho parameter
rho parameter: electroweak interaction
vacuum polarization: effect
effect: vacuum polarization
supersymmetry
model: technicolor
Weinberg angle
coupling: (2W photon)
(2W photon): coupling
coupling: (Z0 2W)

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