Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-04-20
Nucl.Phys. B426 (1994) 249-268; Erratum-ibid. B446 (1995) 334
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages LATEX, 6 figures appended in uuencoded form; Bielefeld preprint BI-TP 94/09
Scientific paper
10.1016/0550-3213(94)90312-3
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 $\MWpm/\MZ$, $\bar\sw^2$, $\Gamma_l$ shows that these data start to become accurate enough to be sensitive to standard (bosonic) contributions to $\Delta y$ beyond fermion loops.
Dittmaier Stefan
Kolodziej Karol
Kuroda Masaaki
Schildknecht Dieter
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