J/ψcouplings to charmed resonances and toπ

We present an evaluation of the strong couplings ${\mathrm{JD}}^{\left(*\right)}{D}^{\left(*\right)}$ and ${\mathrm{JD}}^{\left(*\right)}{D}^{\left(*\right)}\pi$ by an effective field theory of quarks and mesons. These couplings are necessary to calculate $\pi +J/\overrightarrow{\psi }{D}^{\left(*\right)}+D^{\left(*\right)}$ cross sections, an important background to the $J/\psi$ suppression signal in the quark-gluon plasma. We write down the general effective Lagrangian and compute the relevant couplings in the soft pion limit and beyond.