Photoproduction of Baryons Decaying into N pi and N eta

TL;DR

This paper analyzes photoproduction data involving baryons decaying into N pi and N eta, revealing known and new resonances through an isobar model including various exchange processes.

Contribution

It introduces a combined analysis incorporating open strangeness data, identifying new baryon resonances beyond established ones.

Findings

Identification of three baryon resonances with substantial eta N coupling.

Discovery of new resonances N(1840)P_{11}, N(1875)D_{13}, and N(2170)D_{13}.

Confirmation of known resonances N(1535)S_{11}, N(1720)P_{13}, and N(2070)D_{15}.

Abstract

A combined analysis of photoproduction data on \gamma p to \pi N, eta N was performed including the data on K Lambda and K Sigma. The data are interpreted in an isobar model with s--channel baryon resonances and pi, rho,(omega), K, and K^* exchange in the t--channel. Three baryon resonances have a substantial coupling to eta N, the well known N(1535)S_{11}, N(1720)P_{13}, and N(2070)D_{15}. The inclusion of data with open strangeness reveals the presence of further new resonances, N(1840)P_{11}, N(1875)D_{13} and N(2170)D_{13}.