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Feasibility studies of the time-like proton electromagnetic form factor measurements with PANDA at FAIR

Abstract : 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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http://hal.in2p3.fr/in2p3-00429661
Contributor : Sophie Heurteau <>
Submitted on : Tuesday, November 3, 2009 - 5:51:30 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:55 PM

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M. Sudol, M. C. Mora Espi, E. Becheva, J. Boucher, T. Hennino, et al.. Feasibility studies of the time-like proton electromagnetic form factor measurements with PANDA at FAIR. European Physical Journal A, EDP Sciences, 2010, 44, pp.373-384. ⟨10.1140/epja/i2010-10960-8⟩. ⟨in2p3-00429661⟩

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