We argue that the observation of the color-transparency effect in the semiexclusive $A({\pi }^{-},l^{+}{l}^{-})$ process is important for determining whether it is possible to extract the generalized parton distributions of the nucleon from the elementary reaction ${\pi }^{-}p\to l^{+}{l}^{-}n$ at $p_{\mathrm{lab}}=15–20$ GeV/$c$ at small $\left|t\right|$ and large invariant mass of the dilepton pair $l^{+}{l}^{-}$. Assuming that the transverse size of the pionic $q\overline{q}$ pair in the hard interaction point is similar to the one in the reaction ${\gamma }^{*}p\to {\pi }^{+}n$ studied at JLab, we predict large color-transparency effects in the discussed kinematic range. We also suggest that the semiexclusive ${\rho }^0$ production in ${\pi }^{-}$-induced reactions in the same beam momentum region may provide new information on the dynamics of the interaction in the nonvacuum channel, while the $J/\psi$ production can be used to get information on $J/\psi N$ total interaction cross section.

• Received 12 January 2016

DOI:https://doi.org/10.1103/PhysRevC.93.034618