Abstract
We present a lattice calculation for the electromagnetic form factors of $J/\Psi$ by using $N_{f}=2$ twisted mass gauge field configurations. We apply twisted boundary conditions to compute correlation functions at small values of momentum transfer that are difficult to access with periodic boundary conditions. The electromagnetic form factors with more small four-momentum transfer are determined, and further the charge radius and the quadrupole moment for $J/\Psi$ are fitted, respectively.
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