Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-12-28
Phys.Lett. B350 (1995) 75-84
Physics
High Energy Physics
High Energy Physics - Phenomenology
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.
Degrassi Giuseppe
Fanchiotti Sergio
Feruglio Ferruccio
Gambino Paolo
Vicini Alessandro
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