# Production of eta and eta mesons on nucleons and nuclei

Krusche, B. and Wilkin, C.. (2015) Production of eta and eta mesons on nucleons and nuclei. Progress in particle and nuclear physics, 80. pp. 43-95.

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Official URL: http://edoc.unibas.ch/40400/

## Abstract

The production of eta and eta mesons in photon- and hadron-induced reactions on free and quasi-free nucleons and on nuclei is reviewed. The extensive database on gamma N -&gt; eta N, for both proton and neutron targets, is described in detail and its implications for the search for N* resonances much heavier than the dominant S-11(1535) discussed. Though less is currently known about the production of the eta or of eta pi pairs, these also offer tantalizing prospects in the search for the missing isobars. The more limited data available on pion-induced production are still necessary ingredients in the partial wave analysis discussed. The production of the eta-meson in pp and pn collisions shows once again the strong influence of the S-11(1535) isobar, which is in contrast to the relatively weak behaviour seen near threshold for eta production. This difference is reflected in the important final State interaction effects of the eta in nuclei that may even lead to this meson being bound in some systems. The evidence for this is reviewed for both gamma A and pA collisions. The inclusive photoproduction of eta, eta, and eta pi pairs from nuclei provides further information regarding the production mechanism and the interaction of the eta and eta` with nuclei and the eta pi pairs may even allow access to low mass eta A systems that are forbidden in direct single-meson photoproduction. (C) 2014 Elsevier B.V. All rights reserved.
Faculties and Departments: 05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche) Krusche, Bernd Article, refereed Research Article Elsevier B.V. 0146-6410 Publication type according to Uni Basel Research Database: Journal article 30 Jun 2016 11:01 09 May 2016 08:42

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