Nucleon strangeness as the response to a strangeness-sensitive probe in a class of hadron models

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dc.creatorKlabucar, D.
dc.creatorKumericki, K.
dc.creatorMelic, B.
dc.creatorPicek, I.
dc.date2000-04-06
dc.date.accessioned2026-07-07T03:41:06Z
dc.date.available2026-07-07T03:41:06Z
dc.descriptionOn top of its valence quarks, the full nucleon ground state may contain appreciable admixture of s-\bar{s} pairs already at small momentum transfers. This paper discusses strangeness in the mean-field type of nucleon models, and exemplifies this by explicit calculations in the MIT bag model enriched by the presence of instantons. We calculate the instanton contribution to the strangeness in the MIT bag (on top of the standard contribution to strangeness found in that model). Although we do it in an essentially perturbative way, we present a detailed derivation of the formula expressing 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. We do it in detail to clarify our argument that in the context of the mean-field type of quark models (where a Fock state expansion exists and where the nucleon state can be constructed out of single-quark states), the resulting formula acquires a significance beyond perturbation theory.The derivation combines the usage of the evolution operator containing a strangeness source, and Feynman-Hellmann theorem.
dc.descriptionLaTeX2e, 34 pages, 4 figures (included)
dc.identifierhttps://arxiv.org/abs/hep-ph/0004054
dc.identifierhttp://arxiv.org/abs/hep-ph/0004054
dc.identifierFizika B8 (1999) 505-534
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/39508
dc.subjectHigh Energy Physics - Phenomenology
dc.titleNucleon strangeness as the response to a strangeness-sensitive probe in a class of hadron models
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