A determination of the QED coupling at the $Z$ pole

Details A determination of the QED coupling at the $Z$ pole A determination of the QED coupling at the $Z$ pole

1994-11-23

arxiv.org/abs/hep-ph/9411377v3

Phys.Lett. B345 (1995) 558-563

Physics

High Energy Physics

High Energy Physics - Phenomenology

We have made refinements to the calculation of the contribution to $\alpha(M_Z^2)$ from the $\pi^+\pi^-$ production, and from

Scientific paper

10.1016/0370-2693(94)01659-Z

We critically examine the evaluation of the hadronic contribution to the
running of the QED coupling, $\alpha$, from $Q^2=0$ to $Q^2=M_Z^2$. Using data
for $e^+e^-\to{}$hadrons we find that $\alpha(M_Z^2)^{-1} = 128.99\pm 0.06$, as
compared to the existing value of $128.87\pm 0.12$.

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