Deep inelastic scattering and forward production at NLO View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2005-07

AUTHORS

P. Aurenche, Rahul Basu, M. Fontannaz, R. M. Godbole

ABSTRACT

.We present a detailed phenomenological study of forward hadron (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\pi^0$\end{document}) production in deep inelastic scattering, with both the direct and the resolved contributions calculated to NLO accuracy. A comparison of the theoretical predictions for the various distributions with the H1 data and a study of the stability of the QCD predictions under changes of scales is the focus of this study. We obtain a very good overall description of the recent H1 data with the choice of scale \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$Q^2 + E^2_\bot$\end{document}, in contrast to the \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$(Q^2 + E^2_\bot)/2$\end{document} required earlier when the resolved contribution was included only at LO accuracy. We find a more modest variation of the predictions, as the scale is changed from \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$(Q^2 + E^2_\bot)/2$\end{document} to \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$2(Q^2 + E^2_\bot)$\end{document}, as compared to the case where the resolved contribution was included only at LO accuracy. This variation is of the order of the rather large experimental errors. Unfortunately, this fact prevents us from concluding that perturbation theory gives an unambiguous prediction for forward particle production in deep inelastic scattering. However, the overall success of perturbative QCD in explaining the small xBj data means that perhaps a full resummation of the BFKL ladder is not called for. We notice the need for rather large resolved contributions to explain the data at low xBj even at somewhat larger Q2 values. More... »

PAGES

43-52

References to SciGraph publications

  • 1999. Small in EUROPEAN PHYSICAL JOURNAL C
  • 2004-09. Measurement of dijet production at low Q2 at HERA in EUROPEAN PHYSICAL JOURNAL C
  • 2001-02. Next-to-leading order determination of fragmentation functions in EUROPEAN PHYSICAL JOURNAL C
  • 1995-03. Neutral strange particle production in deep inelastic scattering at HERA in ZEITSCHRIFT FÜR PHYSIK C PARTICLES AND FIELDS
  • 2004-08. Forward production and associated transverse energy flow in deep-inelastic scattering at HERA in EUROPEAN PHYSICAL JOURNAL C
  • 2003-09-19. Order-αs2 corrections to semi-inclusive DIS in EUROPEAN PHYSICAL JOURNAL C
  • 2004-05. An NLO calculation of the electroproduction of large-E hadrons in EUROPEAN PHYSICAL JOURNAL C
  • 2002-03. MRST2001: partons and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\alpha_S$\end{document} from precise deep inelastic scattering and Tevatron jet data in EUROPEAN PHYSICAL JOURNAL C
  • 1999. Forward jet production in deep inelastic scattering at HERA in EUROPEAN PHYSICAL JOURNAL C
  • 2004-12. Electroproduction cross section of large-E hadrons at NLOand virtual photon structure function in EUROPEAN PHYSICAL JOURNAL C
  • 2002-12. A NLO calculation of the hadron-jet cross section in photoproduction reactions in EUROPEAN PHYSICAL JOURNAL C
  • 1999-07. The role of resolved virtual photons in the production of forward jets at HERA in EUROPEAN PHYSICAL JOURNAL C
  • 1999. Measurement of multiplicity and momentum spectra in the current and target regions of the Breit frame in Deep Inelastic Scattering at HERA in EUROPEAN PHYSICAL JOURNAL C
  • 2002-07-04. New Generation of Parton Distributions with Uncertainties from Global QCD Analysis in JOURNAL OF HIGH ENERGY PHYSICS
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1140/epjc/s2005-02280-3

    DOI

    http://dx.doi.org/10.1140/epjc/s2005-02280-3

    DIMENSIONS

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