ar X iv : h ep - p h / 99 05 43 8 v 1 2 1 M ay 1 99 9
نویسنده
چکیده
An enhancement for the η production in proton-neutron collisions as compared with that in proton-proton scattering has been recently observed. We present a calculation for the production cross section, in proton-neutron collisions near threshold, within instanton model for the QCD vacuum and show that a specific flavor dependent nonperturbative quark-gluon interaction related to instantons is able to explain the observed enhancement. Pacs: 12.39-x, 13.60.Hb, 14.65-q, 14.70Dj
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