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Electromagnetic pion form factor near physical point in $N_f=2+1$ lattice QCD

J. Kakazu, K.I. Ishikawa, N. Ishizuka, Y. Kuramashi, Y. Nakamura, Y. Namekawa, Y. Taniguchi, N. Ukita, T. Yamazaki, T. Yoshie, for PACS Collaboration

in 34th annual International Symposium on Lattice Field Theory

Contribution: pdf


We compute the electromagnetic form factor of the pion at the mass $m_\pi=0.145 $ GeV on the large volume of the spatial extent 8.1 fm, corresponding to $m_\pi L \approx 6$. We use $N_f = 2 + 1$ configurations generated with a non-perturbative improved Wilson quark action with the stout-smeared link and Iwasaki gauge action at $a^{-1}=2.333$ GeV. We obtain the form factor at small momentum transfer without the twisted boundary condition.Our preliminary results for the form factor and the mean-squared charge radius are reasonably consistent with the experiment.