Electromagnetic Mean Squared Radii of Lambda(1405) in Meson-baryon Dynamics with Chiral Symmetry

TL;DR

This paper evaluates the electromagnetic mean squared radii of Lambda(1405) using chiral unitary approach, revealing its structure as a KbarN bound state with a widely spread K^- around the proton.

Contribution

It introduces a novel calculation of Lambda(1405)'s electromagnetic properties within the chiral unitary framework, emphasizing its KbarN bound state nature.

Findings

Lambda(1405) has a negative electric mean squared radius.

Lambda(1405) exhibits a structure with K^- widely spread around the proton.

Results support Lambda(1405) as a KbarN bound state.

Abstract

Electromagnetic mean squared radii of Lambda(1405) are evaluated in chiral unitary approach. In this approach we regard Lambda(1405) as dynamically generated resonances in the octet meson and octet baryon scattering, and also as KbarN bound state. Especially for the Lambda(1405) as KbarN bound state we obtain negative electric mean squared radius. With the small binding energy of Lambda(1405) in the chiral unitary approach, our results imply that Lambda(1405) has structure that K^- is widely spread around p.