Gluon distributions in nucleons and pions at a low resolution scale

Abstract

In this paper we study the gluon distribution functions in nucleons and pions at a low resolution $Q^2$ scale. This is an important issue since parton densities at low $Q^2$ have always been taken as an external input which is adjusted through DGLAP evolution to fit the experimental data at higher scales. Here, in the framework of a model recently developed, it is shown that the hypothetical cloud of {\it neutral} pions surrounding nucleons and pions appears to be responsible for the characteristic valence-like gluon distributions needed at the inital low scale. As an additional result, we get the remarkable prediction that neutral and charged pions have different intrinsic sea flavor contents.

final version to appear in Phys. Rev. D. Discussion on several points enlarged

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• dbar/ubar Asymmetry and the Origin of the Nucleon Sea
• A new global analysis of deep inelastic scattering data
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Cited by in corpus (3)

• Pion and kaon parton distribution functions in a meson cloud model
• The small $x$ behavior of the gluon structure function from total cross sections
• Low $Q^2$ wave-functions of pions and kaons and their parton distribution functions