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- W2133663987 abstract "We present an up-to-date analysis for a precise determination of the effective fine structure constant and discuss the prospects for future improvements. We advocate to use a determination monitored by the Adler function which allows us to exploit perturbative QCD in an optimal well controlled way. Together with a long term program of hadronic cross section measurements at energies up to a few GeV, a determination of α(MZ) at a precision comparable to the one of the Z mass MZ should be feasible. Presently α(E) at E>1 GeV is the least precisely known of the fundamental parameters of the SM. Since, in spite of substantial progress due to new BaBar exclusive data, the region 1.4 to 2.4 GeV remains the most problematic one a major step in the reduction of the uncertainties are expected from VEPP-2000 [B. Khazin, these proceedings; S. Eidelman, Nucl. Phys. Proc. Suppl. 162 (2006) 323] and from a possible “high-energy” option DAFNE-2 at Frascati [P. Raimondi, these proceedings; G. Venanzoni, Acta Phys. Polon. B 38 (2007) 3421; F. Ambrosino et al., Eur. Phys. J. C 50 (2007) 729]. The up-to-date evaluation reads Δαhad(5)(MZ2)=0.027515±0.000149 or α−1(MZ2)=128.957±0.020." @default.
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- W2133663987 date "2008-09-01" @default.
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- W2133663987 title "The running fine structure constant via the Adler function" @default.
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- W2133663987 doi "https://doi.org/10.1016/j.nuclphysbps.2008.09.010" @default.
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