A coherent interpretation of the form factors of the nucleon in terms of a pion cloud and constituent quarks

被引：0
作者：
J. Friedrich
Th. Walcher
机构：
[1] Universität Mainz,Institut für Kernphysik
来源：
The European Physical Journal A - Hadrons and Nuclei | 2003年 / 17卷
关键词：
Form Factor; Negative Charge; Charge Distribution; Quark Model; Broad Distribution;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The recent measurements of the electric form factor of the neutron suggest that its shape may be interpreted as a smooth broad distribution with a bump at \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$Q^2 \approx$\end{document} 0.3 (GeV/c)2 superimposed. As a consequence the corresponding charge distribution in the Breit frame shows a negative charge extending as far out as 2 fm. It is natural to identify this charge with the pion cloud. This realisation is then used to reanalyse all old and new data of the electric and magnetic from factors of the proton and the neutron by a phenomenological fit and by a fit based on the constituent quark model. It is shown that it is possible to fit all form factors coherently with both ansaetzen and that they all show the signal of the pion cloud.
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页码：607 / 623
页数：16
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