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From Bethe–Salpeter Wave functions to Generalised Parton Distributions

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Abstract

We review recent works on the modelling of generalised parton distributions within the Dyson–Schwinger formalism. We highlight how covariant computations, using the impulse approximation, allows one to fulfil most of the theoretical constraints of the GPDs. Specific attention is brought to chiral properties and especially the so-called soft pion theorem, and its link with the Axial-Vector Ward–Takahashi identity. The limitation of the impulse approximation are also explained. Beyond impulse approximation computations are reviewed in the forward case. Finally, we stress the advantages of the overlap of lightcone wave functions, and possible ways to construct covariant GPD models within this framework, in a two-body approximation.

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Authors and Affiliations

  1. Physics Division, Argonne National Laboratory, Argonne, IL, 60439, USA

    C. Mezrag

  2. CEA-Saclay, Irfu/SPhN, 91191, Gif-Sur-Yvette, France

    H. Moutarde

  3. Departamento de Física Aplicada, Facultad de Ciencias Experimentales, Universidad de Huelva, 21071, Huelva, Spain

    J. Rodríguez-Quintero

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  1. C. Mezrag
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Mezrag, C., Moutarde, H. & Rodríguez-Quintero, J. From Bethe–Salpeter Wave functions to Generalised Parton Distributions. Few-Body Syst 57, 729–772 (2016). https://doi.org/10.1007/s00601-016-1119-8

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