On the instanton-induced portion of the nucleon strangeness

Details On the instanton-induced portion of the nucleon strangeness On the instanton-induced portion of the nucleon strangeness

1998-07-13

arxiv.org/abs/hep-ph/9807357v2

Eur.Phys.J.C9:589-599,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 3 ps figures included, plain LaTeX2e, revised version to appear in Eur. Phys. J. C, several points clarified and ref

Scientific paper

10.1007/s100529900056

We calculate the instanton contribution to the proton strangeness in the MIT bag enriched by the presence of a dilute instanton liquid. The evaluation is based on expressing the nucleon matrix elements of bilinear strange quark operators in terms of a model valence nucleon state and interactions producing quark-antiquark fluctuations on top of that valence state. Our method combines the usage of the evolution operator containing a strangeness source, and the Feynman-Hellmann theorem. It enables one to evaluate the strangeness in different Lorentz channels in, essentially, the same way. Only the scalar channel is found to be affected by the interaction induced by the random instanton liquid.

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