Abstract
We calculate static electromagnetic properties of the decuplet hyperons in the chiral constituent quark model including electromagnetic exchange currents between quarks. We study the effect of exchange currents on charge and magnetic radii, magnetic and quadrupole moments and radiative decay observables. SUF (3) flavour symmetry breaking due to the mass difference between strange and nonstrange quarks is included. Exchange currents dominate in observables (e.g. quadrupole moments), where one-body currents are suppressed, due to selection rules. The quadrupole moment of the ¯ is mainly sensitive to gluon degrees of freedom; its measurement could be used to determine the strength of the effective gluon exchange interaction between light quarks. We compare our results with the sparse experimental data and with predictions from other models.
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