Gluon distributions in nucleons and pions at a low resolution scale

Details Gluon distributions in nucleons and pions at a low resolution scale Gluon distributions in nucleons and pions at a low resolution scale

2000-03-09

arxiv.org/abs/hep-ph/0003088v2

Phys.Rev. D63 (2001) 014001

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1103/PhysRevD.63.014001

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.

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