A Variable-Flavour Number Scheme for NNLO

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dc.creatorThorne, R. S.
dc.date2006-01-30
dc.date2006-03-16
dc.date.accessioned2026-07-07T11:26:52Z
dc.date.available2026-07-07T11:26:52Z
dc.descriptionAt NNLO it is particularly important to have a Variable-Flavour Number Scheme (VFNS) to deal with heavy quarks because there are major problems with both the zero mass variable-flavour number scheme and the fixed-flavour number scheme. I illustrate these problems and present a general formulation of a Variable-Flavour Number Scheme (VFNS)for heavy quarks that is explicitly implemented up to NNLO in the strong coupling constant alpha_S, and may be used in NNLO global fits for parton distributions. The procedure combines elements of the ACOT(chi) scheme and the Thorne-Roberts scheme. Despite the fact that at NNLO the parton distributions are discontinuous as one changes the number of active quark flavours, all physical quantities are continuous at flavour transitions and the comparison with data is successful.
dc.description17 pages, 5 figures included as .ps files, uses axodraw. One additional explanatory sentence after eq. (25). Correction of typos and updated references. To be published in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/hep-ph/0601245
dc.identifierhttp://arxiv.org/abs/hep-ph/0601245
dc.identifierPhys.Rev.D73:054019,2006
dc.identifierdoi:10.1103/PhysRevD.73.054019
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195972
dc.subjectHigh Energy Physics - Phenomenology
dc.titleA Variable-Flavour Number Scheme for NNLO
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