Electromagnetic mean squared radii of Λ(1405)Λ(1405) in chiral dynamics

The electromagnetic mean squared radii, 〈r2〉E〈r2〉E and 〈r2〉M〈r2〉M, of Λ(1405)Λ(1405) are calculated in the chiral unitary model. We describe the excited baryons as dynamically generated resonances in the octet meson and octet baryon scattering. We evaluate values of 〈r2〉E〈r2〉E and 〈r2〉M〈r2〉M for the Λ(1405)Λ(1405) on the resonance pole and obtain their complex values. We also consider Λ(1405)Λ(1405) obtained by neglecting decay channels. For the latter case, we obtain negative and larger absolute electric mean squared radius than that of typical ground state baryons. This implies that Λ(1405)Λ(1405) has structure that K−K− is widely spread around p.