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In this letter, we report precise and robust observational constraints ondark matter-dark energy scattering cross section, using the latest data fromcosmic microwave background (CMB) Planck temperature and polarization, baryonacoustic oscillations (BAO) measurements and weak gravitational lensing datafrom Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS). The scatteringscenario consists of a pure momentum exchange between the dark components, andwe find $\sigma_d < 10^{-29} \, {\rm cm^2}$ at 95\% CL from the joint analysis(CMB + BAO + CFHTLenS), for typical dark matter particle mass of the order 1-10${\rm GeV}/c^2$. We notice that the scattering among the dark components mayinfluence the growth of large scale structure in the Universe, leaving thebackground cosmology unaltered.

Observational constraints on dark matter-dark energy scattering cross section