N* form Factors Based on a Covariant Quark Model

被引：0

作者：

Ramalho, G. ^{[1
]}

机构：

[1] Univ Cruzeiro Sul, Lab Fis Teor & Computac LFTC, BR-01506000 Sao Paulo, SP, Brazil

来源：

FEW-BODY SYSTEMS | 2018年 / 59卷 / 05期

基金：

巴西圣保罗研究基金会;

关键词：

PION CLOUD; ELECTROMAGNETIC-EXCITATION; NUCLEON; MOMENTS; QCD; ELECTROPRODUCTION; PARAMETRIZATIONS; PHOTOPRODUCTION; QUADRUPOLE; EQUATIONS;

D O I：

10.1007/s00601-018-1412-9

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We discuss the results of the covariant spectator quark model for the several transitions, where N is the nucleon and a nucleon excitation. More specifically, we present predictions for the form factors and transition amplitudes associated with the resonances , , , and . The estimates based on valence quark degrees of freedom are compared with the available data, particularly with the recent Jefferson Lab data at low and large momentum transfer (). In general the estimates are in good agreement with the empirical data for GeV, with a few exceptions. The results are discussed in terms of the role of the valence quarks and the meson cloud excitations for the different resonances . We also review our results for the resonance and discuss the relevance of the pion cloud component for the magnetic dipole form factor and the electric and Coulomb quadrupole form factors.

引用

页数：20

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