Does $J/\psi \to {\pi }^{+}{\pi }^{-}$ fix the Electromagnetic Form Factor $F_{\pi }(t)$ at $t=M_{J/\psi }^2$?

J. Milana, S. Nussinov, M. G. Olsson

We show that the $J/\psi \to {\pi }^{+}{\pi }^{-}$ decay is a reliable source of information for the electromagnetic form factor of the pion at $t=M_{J/\psi }^2=9.6{\mathrm{GeV}}^2$ by using ge…