Exchange currents in octet hyperon charge radii

Abstract

Octet hyperon charge radii are calculated in a chiral constituent quark model including electromagnetic exchange currents between quarks. In impulse approximation one observes a decrease of the hyperon charge radii with increasing strangeness. This effect is reduced by exchange currents. Due to exchange currents, the charge radius of the negatively charged hyperons are close to the proton charge radius.

9 pages, 2 eps figures, RevTex, accepted for publication in Phys.Rev.C