Diffusion of hidden charm mesons in hadronic medium
  The drag and diffusion coefficients of a hot hadronic medium have been evaluated by using hidden charm mesons as probes. The matrix elements for the evaluation of these coefficients are calculated using an effective theory as well as from scattering lengths. Although the transport coefficients show a significant rise with temperature its effects on the suppression of $J/\psi$ in hadronic matter is not significant. 
Sukanya Mitra, Sabyasachi Ghosh, Santosh K. Das, Sourav Sarkar and   Jan-e Alam
nucl-th hep-ph