Instantons and $\eta$ Meson Production near threshold in NN collisions
N.I. Kochelev, V.Vento, A.V. Vinnikov
TL;DR
This paper explains the observed enhancement in eta meson production in proton-neutron collisions near threshold by using an instanton model of the QCD vacuum, highlighting the role of flavor-dependent nonperturbative interactions.
Contribution
It introduces a calculation within the instanton model that accounts for the flavor-dependent nonperturbative quark-gluon interactions responsible for the eta production enhancement.
Findings
The instanton model explains the eta production enhancement in pn collisions.
The calculated cross section matches experimental observations.
Flavor-dependent nonperturbative interactions are key to understanding eta production.
Abstract
An enhancement for the 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.
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