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Feasibility studies of the time-like proton electromagnetic form factor measurements with \( \overline{{P}}\)ANDA at FAIR

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Abstract

The possibility of measuring the proton electromagnetic form factors in the time-like region at FAIR with the \( \overline{{P}}\)ANDA detector is discussed. Detailed simulations on signal efficiency for the annihilation of \( \bar{{p}}\) + p into a lepton pair as well as for the most important background channels have been performed. It is shown that precise measurements of the differential cross-section of the reaction \( \bar{{p}}\) + p \( \rightarrow\) e - + e + can be obtained in a wide kinematical range. The determination of the ratio R of the moduli of the electric and magnetic proton form factors will be possible up to a value of momentum transfer squared of q 2 ≃ 14 (GeV/c)^2 with absolute precision from 0.01 to 0.5 (for R ∼ 1 . The total \( \bar{{p}}\) + p \( \rightarrow\) e - + e + cross-section will be measured up to q 2 ≃ 28 (GeV/c)^2. The results obtained from simulated events are compared to the existing data. Sensitivity to the two-photon exchange mechanism is also investigated.

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Author information

Author notes

  1. E. Becheva

    Present address: LLR-Ecole Polytechnique, 91128, Palaiseau, France

Authors and Affiliations

  1. Institut de Physique Nucléaire, CNRS/IN2P3 and Université Paris-Sud, Paris-Sud, France

    M. Sudoł, E. Becheva, J. Boucher, T. Hennino, R. Kunne, D. Marchand, S. Ong, B. Ramstein, J. Van de Wiele, T. Zerguerras & E. Tomasi-Gustafsson

  2. Institut fuer Kernphysik, Johannes Gutenberg Universitaet Mainz, 55099, Mainz, Germany

    M. C. Mora Espí & F. Maas

  3. GSI Helmholtzzentrum fuer Schwerionenforschung, GmbH, 64291, Darmstadt, Germany

    F. Maas

  4. Ruhr Universitaet Bochum, 44801, Bochum, Germany

    B. Kopf, M. Pelizaeus, M. Steinke & J. Zhong

  5. DSM, IRFU, SPhN, Saclay, 91191, Gif-sur-Yvette, France

    E. Tomasi-Gustafsson

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  1. M. Sudoł
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Corresponding author

Correspondence to E. Tomasi-Gustafsson.

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Communicated by Hayian Gao

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Sudoł, M., Mora Espí, M.C., Becheva, E. et al. Feasibility studies of the time-like proton electromagnetic form factor measurements with \( \overline{{P}}\)ANDA at FAIR. Eur. Phys. J. A 44, 373–384 (2010). https://doi.org/10.1140/epja/i2010-10960-8

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