Production of a pion in association with a high-Q**2 dilepton pair in antiproton-proton annihilation at GSI-FAIR
Oct, 2007
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Abstract: (arXiv)
We evaluate the cross section for anti-p p -> l+ l- pi0 in the forward direction 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 pion Transition Distribution Amplitudes (TDA). Using a modelling inspired from the chiral limit for these TDAs, we obtain a first estimate of this cross section, thus demonstrating that this process can be measured at GSI-FAIR.- 12.38.Bx
- 25.43.+t
- anti-p p: annihilation
- lepton: pair production
- pi0: associated production
- small-angle
- mass spectrum: dilepton
- differential cross section: momentum transfer
- energy dependence
- proposed experiment
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