Unexpectedly small empirical vector strangeness of nucleons predicted in a baryon model

Horvatić, Davor and Klabučar, Dubravko and Mekterović, Darko (2007) Unexpectedly small empirical vector strangeness of nucleons predicted in a baryon model. Fizika B, 16 (2). pp. 89-98. ISSN 1330-0016

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Abstract

Most of model considerations of the hidden nucleon strangeness, as well as some preliminary experimental evidence, led to the expectations of relatively sizeable strange vector form factors of the proton. For example, it seemed that the contribution of the fluctuating strange quark-antiquark pairs accounts for as much as one tenth of the proton's magnetic moment. By the same token, baryon models which failed to produce the "vector strangeness" of the nucleon seemed disfavoured. Recently, however, more accurate measurements and more sophisticated data analysis, as well as lattice simulations, revealed that the form factors associated with the vector strangeness of the nucleon are much smaller than thought previously; in fact, due to the experimental uncertainties, the measured strange vector-current proton form factors may be consistent with zero. In the light of that, we re-asses the merit of the baryon models leading to little or no vector strangeness of the nucleon. It is done on the concrete example of the baryon model which essentially amounts to the MIT bag enriched by the diluted instanton liquid.

Item Type: Article
Keywords: proton, magnetic moment, strange vector form factor, strange quark-antiquark pairs, MIT bag enriched by the diluted instanton liquid
Date: 2007
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Publisher: Hrvatsko fizikalno društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 14 Mar 2014 22:06
Last Modified: 21 Mar 2014 11:52
URI: http://digre.pmf.unizg.hr/id/eprint/614

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