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- W3101471997 abstract "We elaborate on a recently suggested effective Lagrangian for charged-current and neutral-current electroweak interactions which in comparison with the standard electroweak theory contains three free parameters $Delta x, Delta y$, $varepsilon$ which quantify different sources for violations of $SU(2)$ symmetry. Within the standard $SU(2)_I times U(1)_Y$ electroweak theory, we present both exact and very much refined approximate analytical one-loop expressions for these parameters in terms of the canonical input, $G_mu, MZ$, $alpz$, the top-quark mass, $Mt$, and the Higgs-boson mass, $MH$. We reemphase the importance of discriminating between the {it empirically well-known purely fermionic} (vacuum polarization) contributions to $Delta x, Delta y$, $varepsilon$ and the {it empirically unknown bosonic} ones with respect to present and future electroweak precision tests. The parameters $Delta x$ and $varepsilon$ are hardly affected by standard bosonic corrections, while the full one-loop results for $Delta y$ differ appreciably from the ones obtained by taking into account fermion loops only. A detailed comparison with the experimental data on $MWpm/MZ$, $barsw^2$, $Gamma_l$ shows that these data start to become accurate enough to be sensitive to standard (bosonic) contributions to $Delta y$ beyond fermion loops." @default.
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- W3101471997 date "1994-09-01" @default.
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- W3101471997 title "On the significance of the electroweak precision data" @default.
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- W3101471997 doi "https://doi.org/10.1016/0550-3213(94)90312-3" @default.
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