München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 14: Hauptvortr
äge
HK 14.3: Hauptvortrag
Dienstag, 21. März 2006, 11:30–12:00, A
Nucleon properties: effective field theories and lattice QCD — •Massimiliano Procura, Bernhard Musch, Tim Wollenweber, Thomas Hemmert, and Wolfram Weise — Physik Department, T39, Technische Universität München
Lattice QCD on one side and chiral effective field theory on the other are progressively developing as important tools to deal with the non-perturbative nature of low-energy QCD and the structure of hadrons. In particular, chiral effective field theory can provide a powerful tool for the extrapolation of nucleon properties from the regime of relatively large quark masses presently accessible to full-QCD lattice simulations, down to the small quark masses relevant for comparison with physical observables.
In our work we explore the feasibility of this approach for the nucleon mass MN [1] and the axial-vector coupling gA [2]. We compare two different formulations of two-flavor Baryon Chiral Effective Field Theory, with and without explicit Δ(1232) degrees of freedom. Present state-of the-art results for the application of effective field theories to the study of the quark mass dependence of nucleon observables will be also discussed.
Supported in part by DFG and BMBF.
[1] M. Procura, B.U. Musch, T. Wollenweber, T.R. Hemmert and W. Weise, forthcoming.
[2] M. Procura, T.R. Hemmert and W. Weise, Nucl. Phys. A755, 649 (2005).