Speaker
Description
We present our recent results for nucleon elastic form factors obtained from 2+1 flavor lattice QCD at the physical point with a large spatial extent of about 10 fm. Our calculations are performed with the PACS10 gauge configurations generated by the PACS Collaboration with the six stout-smeared O(a) improved Wilson-clover quark action and Iwasaki gauge action at beta=1.82 and 2.00 corresponding to lattice spacings of 0.085 fm and 0.063 fm respectively. We first evaluate the isovector quantities including the axial charge that is one of the most important pieces of information on the nucleon structure. Moreover, we also determine three kinds of isovector RMS radii such as electric, magnetic and axial ones at the two lattice spacings. We then discuss the discretization uncertainties on the axial charge and isovector RMS radii towards the continuum limit. Finally, we comment on the isoscalar nucleon form factors required for the evaluation of the proton charge radius.
