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We evaluate the cross section for anti-p p -> l+ l- pi0 in the forwarddirection and for large lepton pair invariant mass. In this kinematical region,the leading-twist amplitude factorises into a short-distance matrix element,long-distance dominated antiproton Distribution Amplitudes and proton to pionTransition Distribution Amplitudes (TDA). Using a modelling inspired from thechiral limit for these TDAs, we obtain a first estimate of this cross section,thus demonstrating that this process can be measured at GSI-FAIR.

Production of a pion in association with a high-Q2 dilepton pair in antiproton-proton annihilation at GSI-FAIR