K* nucleon hyperon form factors and nucleon strangeness

TL;DR

This paper investigates how different nucleon-hyperon-K* form factors influence strange-quark observables in loop models, revealing that softer form factors significantly reduce K* contributions, impacting hadronic loop calculations.

Contribution

It provides an analysis of the dependence of strange-quark observables on NYK* form factors, highlighting the impact of softer form factors on reducing K* contributions in loop models.

Findings

Soft N-Lambda-K* form factors can reduce K* contributions by over an order of magnitude.

The results influence the interpretation of nucleon strangeness in hadronic models.

Dependence of loop results on form factor choice is significant.

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.