Gießen 2007 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Theorie

HK 27.1: Vortrag

Mittwoch, 14. März 2007, 11:15–11:30, C

Nucleon properties: from lattice QCD to the chiral limit — •Massimiliano Procura, Bernhard Musch, Thomas Hemmert, and Wolfram Weise — Physik-Department, Technische Universität München

The combination of lattice QCD and low-energy effective field theories for the strong interactions is developing as a quantitative tool to investigate non-perturbative aspects of nucleon structure. Chiral perturbation theory complements present lattice calculations by providing systematic analytical tools to extrapolate to small quark masses, small momenta and large volumes. We discuss state-of-the-art extrapolations for nucleon observables, including the axial-vector coupling constant g_A [1] and the axial N → Δ transition form factors. The simultaneous analysis of selected nucleon observables at small quark masses promises to lead to an accurate determination of low-energy parameters in the effective theory.

Supported in part by BMBF and DFG.

[1] M. Procura, B. U. Musch, T. R. Hemmert and W. Weise, hep-lat/0610105, to appear in Phys. Rev. D.