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HK: Fachverband Physik der Hadronen und Kerne
HK 47: Hadron Structure and Spectroscopy 10
HK 47.3: Talk
Wednesday, March 25, 2015, 15:00–15:15, T/SR25
Nucleon axial form factors from two-flavour Lattice QCD — •jiayu hua1, parikshit m. junnarkar2, stefano capitani2, dalibor djukanovic2, georg m. von hippel1, benjamin jäger3, harvey b. meyer1,2, thomas d. rae2, and hartmut wittig1,2 — 1PRISMA Cluster of Excellence and Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Mainz, Germany — 2Helmholtz-Institut Mainz, Mainz, Germany — 3Department of Physics, College of Science, Swansea University, Swansea, UK
We present preliminary lattice QCD results on the axial form factor GA(Q2) and the induced pseudoscalar form factor GP(Q2) of the nucleon. A systematic analysis of the excited-state contributions in correlation functions is performed on two-flavour ensembles with O(a) improved Wilson fermions. We observe that the form factors suffer from non-trivial excited-state contributions at the source-sink separations available to us. We use both the matrix elements of the axial current and the pseudoscalar density to extract the form factors.