  Nucleon antinucleon annihilation into a near backward (or forward) produced
meson and a high invariant mass lepton pair admits a factorized description in
terms of antinucleon (or nucleon) distribution amplitudes and nucleon to meson
(or antinucleon to meson) transition distribution amplitudes. We estimate the
cross section of backward (and forward) pion and eta meson production in
association with a high invariant mass lepton pair for the kinematical
conditions of GSI-FAIR. The cross sections are found to be large enough to be
measured with the PANDA detector. Interesting phenomenological applications of
the approach are thus expected.
