Photoproduction of $\eta$ mesons off neutrons from a deuteron target

TL;DR

This paper develops a formalism for analyzing meson photoproduction off deuterons, applies it to $ta$ and $$ mesons, and discusses the nature of a dip-bump structure in the cross section around 1670 MeV.

Contribution

It introduces a new partial wave analysis formalism for meson photoproduction off deuterons and provides insights into the structure of the cross section and helicity amplitudes.

Findings

Interpretations of the dip-bump structure are presented and discussed.

Helicity amplitudes for two low-mass $S_{11}$ states are determined.

The formalism aids in understanding meson photoproduction mechanisms.

Abstract

A formalism is developed for the partial wave analysis of data on meson photoproduction off deuterons and applied to photoproduction of $\eta$ and $\pi^0$ mesons. Different interpretations of a dip-bump structure of the $\eta$ photoproduction cross section in the 1670 MeV region are presented and discussed. Helicity amplitudes for two low-mass $S_{11}$ states are determined.