KN Scattering and the Nucleon Strangeness Radius

Details KN Scattering and the Nucleon Strangeness Radius KN Scattering and the Nucleon Strangeness Radius

1997-05-23

arxiv.org/abs/hep-ph/9705409v2

Phys.Rev.Lett. 80 (1998) 2539-2542

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, RevTex, 1 PS figure, uses epsf.sty, revised to improve clarity, results unchanged

Scientific paper

10.1103/PhysRevLett.80.2539

The leading non-zero electric moment of the nucleon strange-quark vector current is the mean square strangeness radius, $$. We evaluate the lightest OZI-allowed contribution to $$, arising from the kaon cloud, using dispersion relations. Drawing upon unitarity constraints as well as $K^{+}N$ scattering and $e^+e^-\to K\bar{K}$ cross section data, we find the structure of this contribution differs significantly from that suggested by a variety of QCD-inspired model calculations. In particular, we find evidence for a strong $\phi$-meson resonance which may enhance the scale of kaon cloud contribution to an observable level.

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