期刊
NUCLEAR PHYSICS B
卷 813, 期 1-2, 页码 220-258出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysb.2009.01.001
关键词
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资金
- Helmholtz Gemeinschaft [VH-NG-105]
- Deutsche Forschungsgemeinschaft in Sonderforschungsbereich/Transregio 9
- UK Science & Technology Facilities Council (STFC) [PP/E007414/1, ST/G00062X/1]
- Science and Technology Facilities Council [ST/G00062X/1, PP/E007414/1] Funding Source: researchfish
- STFC [PP/E007414/1, ST/G00062X/1] Funding Source: UKRI
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 -> 1. (C) 2009 Elsevier B.V. All rights reserved.
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