$O(N_fα^2)$ Radiative Corrections in Low-Energy Electroweak Processes

Details $O(N_fα^2)$ Radiative Corrections in Low-Energy Electroweak Processes $O(N_fα^2)$ Radiative Corrections in Low-Energy Electroweak Processes

1997-12-08

arxiv.org/abs/hep-ph/9712308v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages LaTeX. 2 figures. Uses prhep97.sty, amsmath.sty and epsfig.sty. Talk presented at the International Europhysics Confer

Scientific paper

Of the the three best-measured electroweak observables, $\alpha$, $G_\mu$ and $M_Z$, the first two are extracted from low-energy processes. Both $G_\mu$ and $M_Z$ are now known to an accuracy of about 2 parts in $10^5$ and there is a proposal to improve the measurement of the muon lifetime by a factor of 10 in an experiment at Brookhaven. Yet calculations of electroweak radiative corrections currently do no better than a few parts in $10^3$--$10^4$ and therefore cannot exploit to available experimental precision. We report on the calculation of the ${\cal O}(N_f\alpha^2)$ corrections to Thomson scattering and the muon lifetime from which $\alpha$ and $G_\mu$, respectively, are obtained. The ${\cal O}(N_f\alpha^2)$ corrections are expected to be a dominant gauge-invariant subset of 2-loop corrections.

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