The meson cloud and the strange form factors of the proton / A nuvem mesônica e os fatores de forma estranhos do próton

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The goal of this work was to include the scalar $\kappa$ meson on the meson cloud of the proton, and then to verify if the strangeness contribution to the electromagnetic properties of the proton could be explained by the meson cloud model. The observables that quantify such a contribution are the electric ($G_E^s$) and magnetic ($G_M^s$) strange form factors, which have been subject of great experimental interest in the last 10 years. Using the version of the cloud which includes the $\kappa$ meson, we calculated $G_E^s$ and $G_M^s$ as a function of the transferred momentum in the interval 0 $\leq Q^2 \leq$ 1.2 GeV$^2$, to cover the full range of available data at the time. We compared our results with existing data for $G_E^s$ and $G_M^s$ and we found a good agreement between experiment and model, showing that including $\kappa$ on the meson cloud of the proton is crucial to understand its strangeness content.

ASSUNTO(S)

meson cloud model modelo da nuvem mesônica estranheza do nucleon non-perturbative methods nucleon strangeness métodos não-perturbativos

ACESSO AO ARTIGO

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