An Improved Determination of ${\alpha }_S$ From Neutrino-Nucleon Scattering

Abstract

We present an improved determination of the proton structure functions $F_2$ and $x{F}_3$ from the CCFR $\nu$-Fe deep inelastic scattering (DIS) experiment. Comparisons to high-statistics charged-lepton scattering results for $F_2$ from the NMC, E665, SLAC, and BCDMS experiments, after correcting for quark-charge and heavy-target effects, indicate good agreement for $x>0.1$ but some discrepancy at lower x. The $Q^2$ evolution of the structure functions yields the quantum chromodynamics (QCD) scale parameter ${\Lambda }_{\overline{MS}}^{NLO,(4)}=337\pm 28$(exp.) MeV. This corresponds to a value of the strong coupling constant at the scale of mass of the Z-boson of ${\alpha }_S(M_Z^2)=0.119\pm 0.002(exp.)\pm 0.004(theory)$ and is one of the most precise measurements of this quantity.

6 pages, RevTeX, Submitted to Phys. Rev. Lett

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