Abstract
The charge form factor of the pion is calculated in lattice QCD. The nonperturbatively improved Sheikholeslami-Wohlert action is used together with the $O(a)$ improved vector current. Other choices for the current are examined. The form factor is extracted for pion masses from 970 down to 360 MeV and for momentum transfers ${Q}^{2}<~2{\mathrm{GeV}}^{2}.$ The mean square charge radius is extracted and compared to previous determinations, and its extrapolation to lower masses discussed.
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