Collinear parton distributions and the structure of the nucleon sea in a light-front meson-cloud model

Stefan Kofler and Barbara Pasquini
Phys. Rev. D 95, 094015 – Published 22 May 2017

Abstract

The unpolarized, helicity and transversity parton distribution functions of the nucleon are studied within a convolution model where the bare nucleon is dressed by its virtual meson cloud. Using light-front time-ordered perturbation theory, the Fock states of the physical nucleon are expanded in a series involving a bare nucleon and two-particle (meson-baryon) states. The bare baryons and mesons are described with light-front wave functions (LFWFs) for the corresponding valence-parton components. Using a representation in terms of overlap of LFWFs, the role of the nonperturbative antiquark degrees of freedom and the valence-quark contribution at the input scale of the model is discussed for the leading-twist collinear parton distributions. After introducing perturbative QCD effects through evolution to experimental scales, the results are compared with available data and phenomenological extractions. Predictions for the nucleon tensor charge are also presented, finding a very good agreement with recent phenomenological extractions.

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  • Received 20 February 2017

DOI:https://doi.org/10.1103/PhysRevD.95.094015

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsNuclear Physics

Authors & Affiliations

Stefan Kofler1,* and Barbara Pasquini2,3,†

  • 1Institut für Physik, Universität Graz, 8010 Graz, Austria
  • 2Dipartimento di Fisica, Università degli Studi di Pavia, I-27100 Pavia, Italy
  • 3Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, I-27100 Pavia, Italy

  • *stefan.kofler@uni-graz.at
  • barbara.pasquini@unipv.it

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Vol. 95, Iss. 9 — 1 May 2017

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