Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-12-22
Nucl.Phys.B813:220-258,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
37 pages, LaTeX, 6 figures (.eps). FORM and Fortran files of main results appended to source
Scientific paper
10.1016/j.nuclphysb.2009.01.001
We compute the coefficient function for the charge-averaged W^(+/-)-exchange structure function F_3 in deep-inelastic scattering (DIS) to the third order in massless perturbative QCD. Our new three-loop contribution to this quantity forms, at not too small values of the Bjorken variable x, the dominant part of the next-to-next-to-next-to-leading order corrections. It thus facilitates improved determinations of the strong coupling alpha_s and of 1/Q^2 power corrections from scaling violations measured in neutrino-nucleon DIS. The expansion of F_3 in powers of alpha_s is stable at all values of x relevant to measurements at high scales Q^2. At small x the third-order coefficient function is dominated by diagrams with the colour structure d_abc d^abc not present at lower orders. At large x the coefficient function for F_3 is identical to that of F_1 up to terms vanishing for x to 1.
Moch Sven
Vermaseren J.
Vogt Adam
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