Two-loop electroweak top corrections: are they under control?

G. Degrassi; S. Fanchiotti; F. Feruglio; P. Gambino; A. Vicini

doi:10.1016/0370-2693(95)00268-P

Two-loop electroweak top corrections: are they under control?

High Energy Physics - Phenomenology 2009-10-28 v1

Authors: G. Degrassi , S. Fanchiotti , F. Feruglio , P. Gambino , A. Vicini

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Abstract

The assumption that two-loop top corrections are well approximated by the $O(G_mu^2 mt^4)$ contribution is investigated. It is shown that in the case of the ratio neutral-to-charged current amplitudes at zero momentum transfer the $O(G_mu^2 mt^2 M_Z^2)$ terms are numerically comparable to the $m_t^4$ contribution for realistic values of the top mass. An estimate of the theoretical error due to unknown two-loop top effect is presented for a few observables of LEP interest.

Keywords

radiative corrections in particle physics electweak radiative corrections

Cite

@article{arxiv.hep-ph/9412380,
  title  = {Two-loop electroweak top corrections: are they under control?},
  author = {G. Degrassi and S. Fanchiotti and F. Feruglio and P. Gambino and A. Vicini},
  journal= {arXiv preprint arXiv:hep-ph/9412380},
  year   = {2009}
}

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13 pages, LaTeX using equations, doublespace, cite macros. Hard copies of the paper including one figure are available from [email protected]

Two-loop electroweak top corrections: are they under control?

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