The role of F_L(x,Q^2) in parton analyses

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dc.creatorMartin, A. D.
dc.creatorStirling, W. J.
dc.creatorThorne, R. S.
dc.date2006-01-30
dc.date2006-03-15
dc.date.accessioned2026-07-07T10:44:42Z
dc.date.available2026-07-07T10:44:42Z
dc.descriptionWe investigate the effect of the structure function F_L in global parton analyses of deep inelastic and related hard scattering data. We perform NLO and NNLO analyses which include the reduced cross section HERA data at high y, as well as earlier direct measurements of F_L. We find that the NNLO analysis gives a better description of F_L at low x than that performed at NLO. Nevertheless the data show evidence of the need of further contributions to F_L, which may be of higher-twist origin. We study such corrections both phenomenologically and theoretically via a renormalon approach. The higher-twist corrections extracted from a successful fit to the data are in general agreement with the theoretical expectations, but there is still room for alternative theoretical contributions, particularly at low x and Q^2. The importance of future measurements of F_L is emphasized.
dc.description13 pages, 5 figures attached as .ps files. Version to appear in Phys. Lett. B. Correction to typos and updating of references
dc.identifierhttps://arxiv.org/abs/hep-ph/0601247
dc.identifierhttp://arxiv.org/abs/hep-ph/0601247
dc.identifierPhys.Lett.B635:305-312,2006
dc.identifierdoi:10.1016/j.physletb.2006.03.013
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182687
dc.subjectHigh Energy Physics - Phenomenology
dc.titleThe role of F_L(x,Q^2) in parton analyses
dc.typetext

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