Heidelberg 2015 – scientific programme

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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. meyer^1,2, thomas d. rae², and hartmut wittig^1,2 — 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 G_A(Q₂) and the induced pseudoscalar form factor G_P(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.