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An estimate of higher twist at small \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$x_{\mathrmB}$\end{document} and low \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$Q^2$\end{document} based upon a Saturation Model
被引：0
作者：
J. Bartels
K. Golec-Biernat
K. Peters
机构：
[1] II. Institut für Theoretische Physik,
[2] Universität Hamburg,undefined
[3] Luruper Chaussee 149,undefined
[4] 22761 Hamburg,undefined
[5] Institute of Nuclear Physics,undefined
[6] Radzikowskiego 152,undefined
[7] 31-342 Krakow,undefined
[8] Poland,undefined
关键词：
General Feature;
Structure Function;
Saturation Model;
Sign Structure;
Transverse Structure;
D O I：
10.1007/s100520000429
中图分类号：
学科分类号：
摘要：
We investigate the influence of higher twist corrections to deep inelastic structure functions in the low-\documentclass[12pt]{minimal}
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\begin{document}$Q^2$\end{document} and small-x HERA region. We review the general features of the lowest-order QCD diagrams which contribute to twist-4 at small-x, in particular the sign structure of longitudinal and transverse structure functions which offers the possibility of strong cancellations in \documentclass[12pt]{minimal}
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\begin{document}$F_2$\end{document}. For a numerical analysis we perform a twist analysis of the saturation model which has been very successful both in describing the structure function and the DIS diffractive cross section at HERA. As the main conclusion, twist 4 corrections are not small in \documentclass[12pt]{minimal}
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\begin{document}$F_L$\end{document} or \documentclass[12pt]{minimal}
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\begin{document}$F_T$\end{document} but in \documentclass[12pt]{minimal}
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\begin{document}$F_2=F_L + F_T$\end{document} they almost cancel. This indicates the limitation on the use of the DGLAP formalism at small x and \documentclass[12pt]{minimal}
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\begin{document}$Q^2$\end{document}. We point out that \documentclass[12pt]{minimal}
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\begin{document}$F_L$\end{document} analysis needs a large twist-4 correction. We also indicate the region of validity of the twist expansion.
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页码：121 / 128
页数：7
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