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26 April 2024

» arxiv » 0907.4478

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Feasibility studies of the time-like proton electromagnetic form factor measurements with PANDA at FAIR
M. Sudol ; M.C. Mora Espi ; 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-Gustafsson ;
Date:	26 Jul 2009
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 $ar 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 $ar p +p o e^++ e^-$ 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 $q^2simeq 14$ (GeV/c)$^2$. The total $ar p +p o e^++e^-$ cross section will be measured up to $q^2simeq 28$ (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.
Source:	arXiv, 0907.4478
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