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We calculate the two leading-twist transverse momentum dependent distributionfunctions of the pion meson, the unpolarized distribution$f_{1\pi}(x,\bm{k}^2_T)$ and the Boer-Mulders function $h_{1\pi}^\perp(x,\bm{k}^2_T)$, using the pion wave functions derived from a light-coneapproach. The evolution effect of the first $\bm k_T$-moment of the pionBoer-Mulders function is studied by employing an approximate evolution kernel.Using the model resulting distributions, we predict the transverse momentumweighted $\cos2\phi$ azimuthal asymmetry in the unpolarized $\pi^- p$ Drell-Yanprocess which can be measured at COMPASS in the near future.

Boer-Mulders function of pion meson and $q_T$-weighted $\cos2\phi$ asymmetry in the unpolarized $\pi^- p$ Drell-Yan at COMPASS