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

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

2007-10-05

arxiv.org/abs/0710.1267v1

Phys.Rev.D76:111502,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 5 pages, 3 figures

Scientific paper

10.1103/PhysRevD.76.111502

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.

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