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Volume 256 - 34th annual International Symposium on Lattice Field Theory (LATTICE2016) - Hadron Structure
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
*corresponding author
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Pre-published on: 2017 February 27
Published on: 2017 March 24
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.
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