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

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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

Scientific paper

10.1016/0370-2693(95)00268-P

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.

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