Do Present LEP Data Provide Evidence for Electroweak Corrections?

Details Do Present LEP Data Provide Evidence for Electroweak Corrections? Do Present LEP Data Provide Evidence for Electroweak Corrections?

1993-08-02

arxiv.org/abs/hep-ph/9308203v1

Mod.Phys.Lett. A8 (1993) 2529-2538; Erratum-ibid. A8 (1993) 3301

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, preprint CERN-TH.6943/93

Scientific paper

The Born approximation, based on $\bar\alpha \equiv\alpha (m_Z)$ instead of $\alpha$, reproduces all electroweak precision measurements within their $(1\sigma)$ accuracy. The low upper limits for the genuinely electroweak corrections constitute one of the major achievements of LEP. The astonishing smallness of these corrections results from the cancellation of a large positive contribution from the heavy top quark and large negative contributions from all other virtual particles. It is precisely the non-observation of electroweak radiative corrections that places stringent upper and lower limits on the top mass.

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