Testing the local SU(2)L×U(1)Y symmetry of vector-boson-fermion interactions

Kneur, J.L.; Kuroda, Minpei; Schildknecht, Dieter

doi:10.1016/0370-2693(91)90649-b

Cited by 15 publications

(33 citation statements)

References 13 publications

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“…99 The authors of Ref. 89 have also investigated the j 3 µ B µ couplings in LEP2 (see the subsection on LEP1). Assuming that the top mass is found at the Tevatron, the expected sensitivity becomes…”

Section: Low Energy Resultsmentioning

confidence: 99%

Electroweak Effective Lagrangians

Wudka

1994

Int. J. Mod. Phys. A

125

154

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Section: Low Energy Resultsmentioning

confidence: 99%

Electroweak Effective Lagrangians

Wudka

1994

Int. J. Mod. Phys. A

125

154

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“…The vacuum polarization due to quarks requires calculations based on the data on e + e − → hadrons via dispersion relations in order to incorporate hadronic (QCD) corrections. The uncertainties in the input data lead to the error in(7). Compare ref [6]…”

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confidence: 95%

On the interpretation of the electroweak precision data

et al. 1993

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The recent precision electroweak data on Γ l ,s 2 W and M W /M Z are compared with the tree-level and the dominant-fermion-loop as well as the full one-loop standardmodel predictions. While the tree-level predictions are ruled out, the dominantfermion-loop predictions, defined by using α(M 2 Z ) ∼ = 1/128.9 in the tree-level formulae, as well as the full one-loop predictions are consistent with the experimental data. Deviations from the dominant-fermion-loop predictions are quantified in terms of an effective Lagrangian containing three additional parameters which have a simple meaning in terms of SU(2) symmetry violation. The effective Lagrangian yields the standard one-loop predictions for specific values of these parameters, which are determined by m t and m H . †

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“…For y f = 1, δ f = 0, we recover the lepton case (11). In terms of a more "physical" set of parameters the Lagrangian (22) takes the form…”

Section: Generalization To Arbitrary Fermionsmentioning

confidence: 99%

Refined analysis of the electroweak precision data

1995

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We refine our recent analysis of the electroweak precision data at the Z 0 pole by including the hadronic decay modes of the Z 0 . Within the framework of an effective Lagrangian we parametrize SU(2) violation by the additional process-specific parameters ∆y ν , ∆y h , and ∆y b (for the Z 0 νν, Z 0 qq, and Z 0 bb vertices) together with the previously introduced parameters ∆x, ∆y, and ε. We find that a six-parameter analysis of the experimental data is indeed feasible, and it is carried out in addition to a four-parameter fit for ∆x, ∆y, ε, and ∆y b only. We reemphasize that the experimental data have become sensitive to the (combined) magnitude of the vertex corrections at the W + lν (W − νl) and Z 0 ll vertices, ∆y, which is insensitive to the notion of the Higgs mechanism but dependent on the non-Abelian, trilinear vector-boson coupling. Full explicit analytical results for the standard one-loop predictions for the above-mentioned parameters are given, and the leading two-loop top-quark effects are included. The analytic formluae for the analysis of the experimental data in terms of the parameters ∆x, ∆y etc. are presented in order to encourage experimentalists to persue such an analysis by themselves with future data.

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Testing the local SU(2)L×U(1)Y symmetry of vector-boson-fermion interactions

Cited by 15 publications

References 13 publications

Electroweak Effective Lagrangians

Electroweak Effective Lagrangians

On the interpretation of the electroweak precision data

Refined analysis of the electroweak precision data

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