Speaker
Dr
Parikshit Junnarkar
(Helmholtz Institut Mainz)
Description
We present preliminary results on the axial form factor G_A(Q^2) and the induced pseudo-scalar form factor G_P(Q^2) of the nucleon. The relevant matrix elements were computed on CLS ensembles with N_f =2 non-perturbatively improved O(a) Wilson fermions at three lattice spacings, namely a = 0.050, 0.063, 0.079 fm. These calculations were performed with pion masses ranging from as low as m_pi = 195 MeV to m_pi = 473 MeV with box lengths ranging from L = 2.4 - 4 fm and up to a total of 4000 measurements on each ensemble. A systematic study of the contribution of excited states is performed by analysing the relevant matrix elements at several source-sink separations. Preliminary results on the axial radius r^2_A are also presented.
Primary authors
Prof.
Hartmut Wittig
(Institut für Kernphysik)
Dr
Parikshit Junnarkar
(Helmholtz Institut Mainz)
Co-authors
Mr
Benjamin Jaeger
(Swansea University)
Dr
Dalibor Djukanovic
(Helmholtz Institut Mainz)
Dr
Georg von Hippel
(University of Mainz)
Prof.
Harvey Meyer
(Institut für Kernphysik, Mainz)
Mr
Jiayu Hua
(Institut für Kernphysik)
Dr
Stefano Capitani
(Helmholtz Institut Mainz)
Dr
Thomas Rae
(Institut für Kernphysik)
