Abstract
We report on the status of the search for eta-mesic nuclei and the studies of the interaction of the eta meson with nucleons. Recently we have completed the analysis of the new WASA-at-COSY data on the production of the eta meson with polarized proton beam. New results on the analyzing power for the pp->ppeta reaction with more than an order of magnitude improved precision shed a new light on the production mechanism of the eta meson in nucleon-nucleon collisions. Also, the latest results of the search for eta-mesic nuclei are discussed.
Highlights
The η particle together with isoscalar η and isovector π0 lay in the origin (S = 0, I3 = 0) of the nonet of pseudoscalar mesons representation
The measurement of the η N scattering length shows that its interaction is rather weak [4]
The WASA-at-COSY collaboration [34] performed three dedicated experiments with aim to search for the η-mesic nuclei in 4He and 3He systems in the deuteron-deuteron and proton-deuteron collisions, respectively [35,36,37,38,39]
Summary
The measurements of the large total cross-section of NN → NNη reaction near the η production threshold [7,8,9,10,11,12,13,14,15,16,17,18] motivated the two-step η production model proposed in [19] In this scenario one of the proton is firstly excited through the exchange of a single meson and forms the S 11 resonance, which in the second step deexcites via the emission of η and nucleon. More details of the analysis can be found in [26]
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