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The European Physical Journal A

, Volume 44, Issue 3, pp 373–384 | Cite as

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

  • M. Sudoł
  • M. C. Mora Espí
  • E. Becheva
  • J. Boucher
  • T. Hennino
  • R. Kunne
  • D. Marchand
  • S. Ong
  • B. Ramstein
  • J. Van de Wiele
  • T. Zerguerras
  • F. Maas
  • B. Kopf
  • M. Pelizaeus
  • M. Steinke
  • J. Zhong
  • E. Tomasi-GustafssonEmail author
Regular Article - Experimental Physics

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.

Keywords

Form Factor Angular Distribution Electromagnetic Calorimeter Antiproton Beam Straw Tube 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • M. Sudoł
    • 1
  • M. C. Mora Espí
    • 2
  • E. Becheva
    • 1
  • J. Boucher
    • 1
  • T. Hennino
    • 1
  • R. Kunne
    • 1
  • D. Marchand
    • 1
  • S. Ong
    • 1
  • B. Ramstein
    • 1
  • J. Van de Wiele
    • 1
  • T. Zerguerras
    • 1
  • F. Maas
    • 2
    • 3
  • B. Kopf
    • 4
  • M. Pelizaeus
    • 4
  • M. Steinke
    • 4
  • J. Zhong
    • 4
  • E. Tomasi-Gustafsson
    • 5
    • 1
    Email author
  1. 1.Institut de Physique NucléaireCNRS/IN2P3 and Université Paris-SudParis-SudFrance
  2. 2.Institut fuer KernphysikJohannes Gutenberg Universitaet MainzMainzGermany
  3. 3.GSI Helmholtzzentrum fuer Schwerionenforschung, GmbHDarmstadtGermany
  4. 4.Ruhr Universitaet BochumBochumGermany
  5. 5.DSM, IRFU, SPhN, SaclayGif-sur-YvetteFrance

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