Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Hadronenstruktur und -spektroskopie

HK 27.1: Gruppenbericht

Dienstag, 5. März 2013, 14:00–14:30, HSZ-101

Electromagnetic form factors of the baryon octet in effective field theory — Torsten Bauer¹, Jan Bernauer^1,2, •Patricia Bickert¹, and Stefan Scherer¹ — ¹Institut für Kernphysik, JGU, Mainz — ²Laboratory for Nuclear Science, MIT, Cambridge, USA

We present a calculation of the electromagnetic form factors of the nucleon to third chiral order in manifestly Lorentz-invariant effective field theory. The ρ and ω mesons as well as the Δ(1232) resonance are included as explicit dynamical degrees of freedom. To obtain a self-consistent theory with respect to constraints we consider the proper relations among the couplings of the effective Lagrangian. For the purpose of generating a systematic power counting, the extended on-mass-shell renormalization scheme is applied in combination with the small-scale expansion. The results for the electric and magnetic Sachs form factors are analyzed in terms of experimental data and compared to previous findings in the framework of chiral perturbation theory. Finally, we present the results of a three-flavor calculation of the baryon-octet form factors including vector-meson degrees of freedom.