Electromagnetic multipoles - theory issues
M.M. Giannini
TL;DR
This paper discusses theoretical predictions of the Hypercentral Constituent Quark Model for helicity amplitudes, comparing them with experimental data and highlighting the significance of pion cloud contributions at low momentum transfer.
Contribution
It emphasizes the role of pion cloud effects in explaining discrepancies between model predictions and experimental data for helicity amplitudes.
Findings
Pion cloud significantly contributes to low Q^2 helicity amplitudes.
Model predictions align better with data when pion cloud effects are included.
Comparison with Mainz group analysis supports the importance of pion contributions.
Abstract
Some predictions of the Hypercentral Constituent Quark Model for the helicity amplitudes are discussed and compared with data and with the recent analysis of the Mainz group; the role of the pion cloud contribution in explaining the major part of the missing strength at low is emphasized.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Particle physics theoretical and experimental studies · Black Holes and Theoretical Physics