Oblique Corrections To The W Width

Details Oblique Corrections To The W Width Oblique Corrections To The W Width

1993-09-21

arxiv.org/abs/hep-ph/9309307v1

Phys.Rev. D49 (1994) 1363-1369

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages (LaTeX), one PostScript figure not included (available upon request)

Scientific paper

10.1103/PhysRevD.49.1363

The lowest-order expression for the partial $W$ width to $e \nu ,~\Gamma (W \to e \nu) = G_\mu M_W^3 /(6 \pi \sqrt{2})$, has no oblique radiative corrections from new physics if the measured $W$ mass is used. Here $G_\mu = (1.16639 \pm 0.00002) \times 10^{-5}$ GeV/$c^2$ is the muon decay constant. For the present value of $M_W = (80.14 \pm 0.27)$ GeV/$c^2$, and with $m_t = 140$ GeV$/c^2$, one expects $\Gamma (W \to e \nu) = (224.4 \pm 2.3)$ MeV. The total width $\Gamma_{\rm tot}(W)$ is also expected to lack oblique corrections from new physics, so that $\Gamma_{\rm tot} (W)/ \Gamma (W \to e \nu) = 3 + 6 [1 + \{\alpha_s (M_W)/\pi \}]$. Present data are consistent with this prediction.

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