Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-07-26
Eur.Phys.J.A44:373-384,2010
Physics
Nuclear Physics
Nuclear Experiment
12 pages, 4 tables, 8 figures Revised, added details on simulations, 4 tables, 9 figures
Scientific paper
10.1140/epja/i2010-10960-8
The possibility of measuring the proton electromagnetic form factors in the time-like region at FAIR with the \PANDA 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 precision measurements of the differential cross section of the reaction $\bar p +p \to e^++ e^-$ can be obtained in a wide angular and kinematical range. The individual determination of the moduli of the electric and magnetic proton form factors will be possible up to a value of momentum transfer squared of $q^2\simeq 14$ (GeV/c)$^2$. The total $\bar p +p\to e^++e^-$ cross section will be measured up to $q^2\simeq 28$ (GeV/c)$^2$. The results obtained from simulated events are compared to the existing data. Sensitivity to the two photons exchange mechanism is also investigated.
Becheva E.
Boucher J.
de Wiele van J.
Hennino T.
Kopf B.
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