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Mar 14 – 16, 2025
US/Pacific timezone

Nucleon spin structure in the strong QCD regime

Not scheduled
30m
plenary

Speaker

Alexandre Deur (Thomas Jefferson National Accelerator Facility)

Description

The nucleon spin structure is an important aspect of hadronic physics, and spin sum rules have been extensively used to study it. We will report on the latest experimental results published on nucleon spin sum rules. The data were taken at Jefferson Lab in Hall A and B by experiments E97-110 and EG4, respectively. They covered the very low Q2 domain, down to Q20.02 GeV2, Chiral Effective Field Theory (χEFT) is applicable, thereby providing a test of its predictions. While some of the measurements agree with the state-of-the-art χEFT theoretical predictions, others are in tensions, including δLTn(Q2) for which χEFT prediction was expected to be robust. This suggests that χEFT does not yet consistently describe nucleon spin observables, even in the very low Q2 domain covered by the experiments.

Primary author

Alexandre Deur (Thomas Jefferson National Accelerator Facility)

Presentation materials

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