for PACS Collaboration

arXiv2017

Systematic study of operator dependence in nucleus calculation at large quark mass

Recently it is claimed that there is a significant systematic error from excited state contributions in the nucleus correlation functions by comparing with calculations using the exponential and wall source operators. However, the wall source result is obtained in much earlier time than the plateau region. In order to investigate the systematic error in the plateau region, we calculate the correlation functions with both the operators in quenched QCD at 0.8 GeV pion mass and in $N_f=2+1$ QCD at 0.7 GeV pion mass in high accuracy. In this report we present preliminary results of those calculations, and show that the energy shift obtained from the two sources agree with each other, if those are determined from a region, where both the nucleon and two-nucleon correlation functions have plateaus.

hep-lat↗

arXiv2015

Light nuclei and nucleon form factors in $N_f=2+1$ lattice QCD

We present our result of binding energy of light nuclei with the nuclear mass number less than or equal to four at the pion mass $m_π= 0.3$ GeV. The simulations are performed in $N_f=2+1$ QCD with Iwasaki gauge and a non-perturbative improved Wilson quark actions at the lattice spacing of $a = 0.09$ fm. We discuss the $m_π$ dependence of the binding energies by comparing with previous results. Furthermore, we show preliminary results for the axial charge and the Dirac radius obtained from the nucleon form factors at almost physical $m_π$.

hep-lat↗