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Proton Timelike Form Factors Near Threshold via Antiproton-Nucleus Electromagnetic Annihilation

Abstract : In the reaction of the antiproton-deuteron electromagnetic annihilation pbar + d --> e+e-n the value of the invariant mass M of the (e+e-) pair can be near or below the (pbar p) mass even for enough high momentum of incident antiproton. This allows to access the proton electromagnetic form factors in the time-like region of q^2 near the (pbar p) threshold. We estimate the cross section dsigma(pbar + d --> e+e-n)/dM for an antiproton beam momentum of 1.5 GeV/c. We find that near the (pbar p) threshold this cross section is about 1 pb/MeV. The case of heavy nuclei target is also discussed. Elements of experimental feasibility are presented for the process pbar + d --> e+e-n in the context of the Panda project. We conclude that this process has a chance to be measurable at Panda.
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http://hal.in2p3.fr/in2p3-00575016
Contributor : Jeanine Pellet <>
Submitted on : Wednesday, March 9, 2011 - 12:46:30 PM
Last modification on : Thursday, February 25, 2021 - 10:58:32 AM

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  • HAL Id : in2p3-00575016, version 1
  • ARXIV : 1010.2872

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V. A. Karmanov, H. Fonvieille. Proton Timelike Form Factors Near Threshold via Antiproton-Nucleus Electromagnetic Annihilation. 29th International Workshop on Nuclear Theory, Jun 2010, Sofia, Bulgaria. ⟨in2p3-00575016⟩

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