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The process p¯↦γπwithin the handbag approach

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Abstract.

We analyse the exclusive channel p¯↦γπ0, assuming handbag dominance. The soft parts are parametrized in terms of CGLN amplitudes for the q¯↦γπ0 transition and form factors for the p¯↦q¯ ones; the latter represent moments of Generalized Distribution Amplitudes. We present a combined fit to Fermilab data from E760 taking simultaneously into account information from other exclusive reactions, especially from p¯↦γγ data. Overall a nicely consistent picture emerges, such that one can hope, that our theoretical analysis will be reliable also for the kinematics of GSI/FAIR, which, hopefully, will provide much more precise and complete data. Consequently, data from this facility should improve our knowledge both on the proton-antiproton distribution amplitudes and the pion production mechanism.

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Authors and Affiliations

  1. Fachbereich Physik, Universität Wuppertal, D-42097, Wuppertal, Germany

    P. Kroll

  2. Institut für Theoretische Physik, Universität Regensburg, D-93040, Regensburg, Germany

    A. Schäfer

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  1. P. Kroll
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  2. A. Schäfer
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Kroll, P., Schäfer, A. The process p¯↦γπwithin the handbag approach. Eur. Phys. J. A 26, 89–98 (2005). https://doi.org/10.1140/epja/i2005-10153-8

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