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SUDOL, M; MORA ESPI, M. C; ZERGUERRAS, T; MAAS, F; KOPF, B; PELIZAEUS, M; STEINKE, M; ZHONG, J; TOMASI-GUSTAFSSON, E; BECHEVA, E; BOUCHER, J; HENNINO, T; KUNNE, R; MARCHAND, D; ONG, S; RAMSTEIN, B; VAN DE WIELE, J
The European physical journal. A, Hadrons and nuclei, 2010, Volume: 44, Issue: 3Journal Article
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.
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