On the instanton-induced portion of the nucleon strangeness

Klabučar, Dubravko; Kumerički, Krešimir; Melić, Blaženka; Picek, Ivica (1999) On the instanton-induced portion of the nucleon strangeness. European Physical Journal C: Particles and Fields, 9 (4). pp. 589-599. ISSN 1434-6044

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	vector form-factors; chiral bag model; magnetic-moments; matrix-elements; proton; quarks; scattering; vacuum; qcd; hadrons
Subjects:	NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Theoretical Physics Division
Projects:	Project title Project leader Project code Project type Teorijska istraživanja osobina fundamentalnih čestica Branko Guberina 00980102 MZOS Struktura elementarnih čestica i kvantna teorija polja Dubravko Tadić 119222 MZOS
Depositing User:	Blaženka Melić
Date Deposited:	07 Oct 2013 09:32
URI:	http://fulir.irb.hr/id/eprint/727
DOI:	10.1007/s100529900056

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