Deuteron photodisintegration by polarized photons in the region of the $d^*(2380)$

TL;DR

This study presents the first large-acceptance measurement of beam-spin asymmetry in deuteron photodisintegration at energies above the delta resonance, offering new insights into the underlying mechanisms and the photocoupling of the $d^*(2380)$ hexaquark.

Contribution

It provides the first large-acceptance measurement of beam-spin asymmetry in this energy range, constraining models of photodisintegration and the $d^*(2380)$ hexaquark.

Findings

New constraints on photodisintegration mechanisms

Insights into the photocoupling of $d^*(2380)$

Enhanced understanding of reaction dynamics at high energies

Abstract

We report the first large-acceptance measurement of the beam-spin asymmetry for deuteron photodisintegration ($\vec{\gamma} d\to pn$) in the photon energy range $400<E_{\gamma}<630$~MeV. The measurement provides important new constraints on the mechanisms of photodisintegration above the delta resonance and on the photocoupling of the recently discovered $d^*(2380)$ hexaquark.