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Sep 24 – 29, 2023
US/Eastern timezone

Nucleon Spin Sum Rules and Neutron Spin Polarizabilities at low $Q$

Sep 27, 2023, 9:30 AM
20m
Junior D3 (Durham Convention Center)

Junior D3

Durham Convention Center

Talk Low Energy Spin Physics with Lepton, Photon and Hadron Probes Low Energy Spin Physics with Lepton, Photon and Hadron Probes

Speaker

Alexandre Deur (Jefferson Lab)

Description

We will report on recently published experimental results on spin sum rules, and particularly on the generalized spin polarizabilities $\gamma_0^n(Q^2)$ and $\delta_{LT}^n(Q^2)$. The data were taken at Jefferson Lab in Hall A and B by experiments E97-110 and EG4, respectively. They covered the very low $Q^2$ domain, down to $Q^2 \sim 0.02$ GeV$^2$, where Chiral Effective Field Theory ($\chi$EFT) predictions should be valid. While some obervables agree with the state-of-the-art $\chi$EFT theoretical predictions, others are in tensions, including $\delta_{LT}^n(Q^2)$ for which $\chi$EFT prediction was expected to be robust. This suggests that $\chi$EFT does not yet consistently describe nucleon spin observables, even in the very low $Q^2$ domain covered by the experiments.

Primary author

Alexandre Deur (Jefferson Lab)

Presentation materials