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HK: Fachverband Physik der Hadronen und Kerne

HK 32: Theorie

HK 32.3: Talk

Wednesday, March 14, 2007, 14:45–15:00, C

The quark-mass dependence of the isovector electromagnetic radii of the nucleon — •Tobias Gail and Thomas Hemmer — Institut fuer theoretische Physik T39, Physik Department der TU-Muenchen, James Franck Strasse, 85748 Garching

We present an analysis of the quark-mass dependence of the mean square radii of the isovector form factors of the nucleon, quantities which - at the physical point - are known to be strongly affected by pion cloud dynamics. For our analysis we rely on a covariant framework of chiral effective field theory and perform a calculation up to next-to-leading one-loop order utilizing a modified infrared regularization scheme [1]. We discuss the applicability of the result for chiral extrapolations of currently available lattice data including an extensive error analysis and compare our results to an earlier investigation [2].

This work has been supported by GSI and I3HP.

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

[2] QCDSF Collaboration (M. Gockeler et al.), Phys.Rev. D71:034508 (2005).