Details

Autor(en) / Beteiligte

• Ledwig, T.
• Pascalutsa, V.
• Vanderhaeghen, M.
• Martin-Camalich, J.

Titel

Electromagnetic moments of quasi-stable baryons

Ist Teil von

• AIP conference proceedings, 2011, Vol.1374 (1)

Ort / Verlag

United States

Erscheinungsjahr

2011

Beschreibungen/Notizen

• We address electromagnetic properties of quasi-stable baryons in the context of chiral extrapolations of lattice QCD results. For particles near their decay threshold we show that an application of a small external magnetic field changes the particle's energy in a non-analytic way. The conventional electromagnetic moments are only well-defined when the background field B satisfies |eB|/2M{sub *}<<|M{sub *}-M-m| where M{sub *} is the mass of the resonance and M, m the masses of the decay products. A direct application of this situation is the chiral extrapolation of the {Delta}(1232)-isobar electromagnetic properties. We discuss such an extrapolation of the {Delta}(1232)-isobar magnetic dipole, electric quadrupole and magnetic octupole moments by a covariant chiral effective field theory.