On the instanton-induced portion of the nucleon strangeness
1 Department of Physics, Faculty of Science,
University of Zagreb, P.O.Box 162, Bijenicka cesta 32, HR-10001
2 Theoretical Physics Division, Rud-0.70exer Boskovic Institute, Bijenicka cesta 54, HR-10001 Zagreb, Croatia
Received: 12 February 1999 / Published online: 30 June 1999
We calculate the instanton contribution to the proton strangeness in an MIT bag enriched by the presence of a dilute instanton liquid. The evaluation is based on the expression of the nucleon matrix elements of bilinear strange-quark operators in terms of a model valence nucleon state and the interactions producing quark-antiquark fluctuations on top of that valence state. Our method combines use of the 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.