Two-loop heavy-top effects in the Standard Model

Barbieri, Riccardo; Beccaria, Matteo; Ciafaloni, Paolo; Curci, G; Viceré, A.

doi:10.1016/0550-3213(93)90448-x

Cited by 160 publications

(164 citation statements)

References 11 publications

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“…In the q → 0 limit, these diagrams can be interpreted as corrections to the goldstone wavefunction renormalizations Z. We thus arrive at a very useful relation [57][58][59][60][61][62]:…”

Section: Jhep03(2012)046mentioning

confidence: 99%

Exploring T and S parameters in Vector Meson Dominance models of strong electroweak symmetry breaking

Orgogozo

Rychkov

2012

J. High Energ. Phys.

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Abstract:We revisit the electroweak precision tests for Higgsless models of strong EWSB. We use the Vector Meson Dominance approach and express S and T via couplings characterizing vector and axial spin-1 resonances of the strong sector. These couplings are constrained by the elastic unitarity and by requiring a good UV behavior of various formfactors. We pay particular attention to the one-loop contribution of resonances to T (beyond the chiral log), and to how it can improve the fit. We also make contact with the recent studies of Conformal Technicolor. We explain why the second Weinberg sum rule never converges in these models, and formulate a condition necessary for preserving the custodial symmetry in the IR.

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“…In the q → 0 limit, these diagrams can be interpreted as corrections to the goldstone wavefunction renormalizations Z. We thus arrive at a very useful relation [57][58][59][60][61][62]:…”

Section: Jhep03(2012)046mentioning

confidence: 99%

Exploring T and S parameters in Vector Meson Dominance models of strong electroweak symmetry breaking

Orgogozo

Rychkov

2012

J. High Energ. Phys.

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“…The top Yukawa coupling enters the SM prediction of EWPO starting at O(αα t ) [27]. Indirect bounds on this coupling can be obtained if one assumes that the usual relation between the Yukawa coupling and the top quark mass, y t = √ 2 m t /v (where v is the vacuum expectation value), is modified.…”

Section: Indirect Determination Of the Sm Top Yukawa Couplingmentioning

confidence: 99%

Physics impact of a precise determination of the top quark mass at an e⁺e⁻linear collider

Heinemeyer¹,

Kraml

Porod

et al. 2003

J. High Energy Phys.

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At a prospective e + e − Linear Collider (LC) a very precise determination of the top quark mass with an accuracy of δm t 100 MeV will be possible. This is to be compared with the envisaged accuracy of δm t = 1-2 Gev at the Tevatron and the LHC. We discuss the physics impact of such a precise determination of m t , focusing on the Standard Model (SM) and its minimal supersymmetric extension (MSSM). In particular, we show the importance of a precise knowledge of m t for electroweak precision observables, and for Higgs physics and the scalar top sector of the MSSM. Taking the mSUGRA model as a specific example, we furthermore demonstrate the importance of a precise m t value for the prediction of sparticle masses and for constraints on the parameter space allowed by the relic density. The uncertainty in m t also significantly affects the reconstruction of the supersymmetric high scale theory. We find that going from hadron collider to LC accuracy in m t leads to an improvement of the investigated quantities by up to an order of magnitude.

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“…In that limit the gauge bosons play the role of external sources and the only propagating fields are the quarks, the Higgs field, and the charged and neutral Goldstone bosons G ± and G 0 . As explained in [28,29] one may relate the one-loop vertex Zbb to the corresponding G 0 bb vertex by means of a Ward identity; the latter is a direct consequence of current conservation, which holds for the neutral current before and after the Higgs doublet acquires a vacuum expectation value v. In practice, carrying out the calculation in the aforementioned limit amounts to the elementary computation of the one-loop off-shell vertex G 0 bb. In the gaugeless limit and for massless b-quarks the only contribution to this vertex is depicted in Fig.…”

Section: Calculating Z → Bbmentioning

confidence: 99%

Universal extra dimensions andZ→bb¯

2003

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We study, at the one loop level, the dominant contributions from a single universal extra dimension to the process Z → bb. By resorting to the gaugeless limit of the theory we explain why the result is expected to display a strong dependence on the mass of the top-quark, not identified in the early literature. A detailed calculation corroborates this expectation, giving rise to a lower bound for the compactification scale which is comparable to that obtained from the ρ parameter.An estimate of the subleading corrections is furnished, together with a qualitative discussion on the difference between the present results and those derived previously for the non-universal case.

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Two-loop heavy-top effects in the Standard Model

Cited by 160 publications

References 11 publications

Exploring T and S parameters in Vector Meson Dominance models of strong electroweak symmetry breaking

Exploring T and S parameters in Vector Meson Dominance models of strong electroweak symmetry breaking

Physics impact of a precise determination of the top quark mass at an e⁺e⁻linear collider

Universal extra dimensions andZ→bb¯

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Two-loop heavy-top effects in the Standard Model

Cited by 160 publications

References 11 publications

Exploring T and S parameters in Vector Meson Dominance models of strong electroweak symmetry breaking

Exploring T and S parameters in Vector Meson Dominance models of strong electroweak symmetry breaking

Physics impact of a precise determination of the top quark mass at an e+e−linear collider

Universal extra dimensions andZ→bb¯

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Product

Resources

About

Physics impact of a precise determination of the top quark mass at an e⁺e⁻linear collider