Workshop for young scientists with research interests focused on physics at FAIR

We propose to describe the process $p\overline{p}\to {\pi }^{-}p{i}^{+}$ in a perturbative QCD motivated framework where a double-handbag hard process $ud\overline{u}\overline{d}\to d\overline{d}$ factorizes from transition distribution amplitudes (TDAs). A TDA describes the non-perturbative transition of the proton to the meson by emission of 2 quarks and absorption of an antiquark (analogously for the $\overline{p}\to {\pi }^{-}$). We advocate that the scale allowing this factorization is the large transverse momentum transfer. We calculate this process in a simplified framework in which the proton is considered as a quark-(scalar) diqark. We model the TDAs as overlaps of ight-cone wave functions and present the expected cross sections for the PANDA experiment at GSI-FAIR.