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We have calculated the coefficient functions for the structure functions F_2,F_L and F_3 in nu-nubar charged-current deep-inelastic scattering (DIS) at thethird order in the strong coupling alpha_s, thus completing the description ofunpolarized inclusive W^(+-) exchange DIS to this order of masslessperturbative QCD. In this brief note, our new results are presented in terms ofcompact approximate expressions that are sufficiently accurate forphenomenological analyses. For the benefit of such analyses we also collect, ina unified notation, the corresponding lower-order contributions and the flavournon-singlet coefficient functions for nu+nubar charged-current DIS. Thebehaviour of all six third-order coefficient functions at small Bjorken-x isbriefly discussed.

Non-singlet coefficient functions for charged-current deep-inelastic scattering to the third order in QCD