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Mar 28 – 30, 2022
Jefferson Lab / Messina University
Europe/Paris timezone

Spin at high-x

Mar 30, 2022, 3:00 PM
30m
Jefferson Lab / Messina University

Jefferson Lab / Messina University

Polo Papardo, edificio SBA, Viale Ferdinando Stagno d'Alcontres 31, Messina (Italy)

Speaker

Sebastian Kuhn (Old Dominion University)

Description

Nucleon valence quark structure at very high values of the scaling variable $x$ is sensitive to the mechanism of SU(6) breaking. In particular the valence quark polarizations $\Delta u/u$ and $\Delta d/d$ can be predicted by quark models, perturbative QCD, and other approaches, with significantly different expected
results. Present data are not sufficiently precise in the high-$x$ region to stringently test these predictions. New experiments at Jefferson Lab with 12 GeV beam will significantly improve our knowledge of these quantities out to $x \approx 0.8$, albeit with significant remaining sensitivity to models and assumptions used in their extraction from experimental results. In my talk, I will lay out the present situation and expected results for the 12 GeV program, and address the question what improvements we can expect from a higher luminosity, 24 GeV electron beam at Jefferson Lab.

Primary author

Sebastian Kuhn (Old Dominion University)

Presentation materials