Improved Determination ofαsFrom Neutrino-Nucleon Scattering
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Abstract
We present an improved determination of the proton structure functions ${F}_{2}$ and ${\mathrm{xF}}_{3}$ from the Columbia-Chicago-Fermilab-Rochester Collaboration $\ensuremath{\nu}\ensuremath{-}\mathrm{Fe}$ deep inelastic scattering experiment. Comparisons to corrected high-statistics charged-lepton scattering results for ${F}_{2}$ from the NMC, E665, SLAC, and BCDMS experiments indicate good agreement for $x>0.1$ but some discrepancy at lower $x$. The ${Q}^{2}$ evolution of both the ${F}_{2}$ and ${\mathrm{xF}}_{3}$ structure functions yields a value of the strong coupling constant at the scale of mass of the $Z$ boson of ${\ensuremath{\alpha}}_{s}({M}_{Z}^{2})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.119\ifmmode\pm\else\textpm\fi{}0.002(\mathrm{expt})\ifmmode\pm\else\textpm\fi{}0.004(\mathrm{theory})$. This is one of the most precise measurements of this quantity.
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