$N^{\bf *}$ decays to $N\omega$ from new data on $\gamma p\to \omega p$

TL;DR

This paper analyzes new experimental data on the reaction $\gamma p o \omega p$ to determine properties of nucleon resonances decaying into $N\omega$, providing first-time measurements of many branching ratios.

Contribution

It introduces a comprehensive partial wave analysis of $\gamma p o \omega p$ data, extracting twelve $N^* o N\omega$ branching ratios, many of which are measured for the first time.

Findings

Determined twelve $N^* o N\omega$ branching ratios.

Provided detailed partial wave analysis of $\gamma p o \\omega p$ data.

First-time measurements for most of these branching ratios.

Abstract

Data on the reaction $\gamma p\to \omega p$ with $\omega\to\pi^0\gamma$, taken with unpolarized or polarized beams in combination with an unpolarized or polarized proton-target, were analyzed within the Bonn-Gatchina (BnGa) partial wave analysis. Differential cross sections, several spin density matrix elements, the beam asymmetry $\Sigma$, the normalized helicity difference $E$, and the correlation $G$ between linear photon and longitudinal target polarization were included in a large data base on pion and photo-induced reactions. The data on $\omega$ photoproduction are used to determine twelve $N^*\to N\omega$ branching ratios; most of these are determined for the first time.