Theory Viewpoint on Extracting Nucleon Polarisabilities in Low-Energy Compton Scattering

TL;DR

This paper reviews recent experimental and theoretical progress in extracting nucleon polarisabilities from low-energy Compton scattering, highlighting challenges, uncertainties, and future prospects for precise measurements.

Contribution

It provides a summarized viewpoint on the current status and future directions for accurately determining nucleon polarisabilities from Compton scattering data.

Findings

Recent experimental and theoretical advancements reviewed

Identified key uncertainties in polarisability extraction

Outlined future prospects for precision measurements

Abstract

During the workshop "Compton Scattering off Protons and Light Nuclei: pinning down the nucleon polarisabilities" (ECT*, Trento, Italy, 29 July -- 2 August 2013, http://www.ectstar.eu/node/98), recent developments had been reviewed in experimental and theoretical studies of real and virtual Compton scattering, static and generalized dipole scalar and spin polarisabilities of nucleons, as well as related phenomena in physics of muonic atoms. A vivid topic at the workshop was pathways towards the most precise extraction of the static polarisabilities from low-energy Compton cattering---including pertinent theoretical uncertainties. Being asked by our experimental colleagues, we prepared during the workshop a short letter with conclusions of the discussion, emphasising future prospects.