K* nucleon hyperon form factors and nucleon strangeness

Abstract

A crucial input for recent meson hyperon cloud model estimates of the nucleon matrix element of the strangeness current are the nucleon-hyperon-K* (NYK*) form factors which regularize some of the arising loops. Prompted by new and forthcoming information on these form factors from hyperon-nucleon potential models, we analyze the dependence of the loop model results for the strange-quark observables on the NYK* form factors and couplings. We find, in particular, that the now generally favored soft N-Lambda-K* form factors can reduce the magnitude of the K* contributions in such models by more than an order of magnitude, compared to previous results with hard form factors. We also discuss some general implications of our results for hadronic loop models.

9 pages, 8 figures, new co-author, discussion extended to the momentum dependence of the strange vector form factors

References in corpus (2)

• Constraints on vector mesons with finite momentum in nuclear matter
• Testing the Meson Cloud Model in Inclusive Meson Production

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• Strangeness magnetic form factor of the proton in the extended chiral quark model
• Can the meson cloud explain the nucleon strangeness?