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HK: Fachverband Physik der Hadronen und Kerne

HK 32: Theorie

HK 32.2: Talk

Wednesday, March 14, 2007, 14:30–14:45, C

Pion-electroproduction at the Delta(1232) resonance in chiral effective field theory — •Tobias Gail and Thomas Hemmert — Institut fuer theoretische Physik T39, Physik Department der TU - Muenchen, James Franck Strasse, 85748 Garching

An anlaysis of the electromagnetic nucleon-to-Delta transition - a process providing information about possible nucleon deformations - in chiral effective field theory has lead to the prediction of unexpected turning points in the momentum dependence of the associated quadrupole form factors [1]. To further examine these predictions we extend the analysis to pion-electroproduction at the Delta(1232) resonance. The theoretical framework for our analysis is chiral effective field theory with explicit Delta degrees of freedom (SSE) which we apply up to leading one-loop order. In particular we discuss the momentum transfer dependent multipoles M₁₊(q²), E₁₊(q²) and S₁₊(q²) [2].

This work has been supported by GSI and I3HP.

[1] T.A. Gail and T.R. Hemmert, Eur.Phys.J. A28:91-105 (2006).

[2] T.A. Gail and T.R. Hemmert, forthcoming.