Asymptotic Behavior of Nucleon Electromagnetic Form Factors in Space- and Time-Like Regions

2000/10/13 by E. Tomasi‐Gustafsson, Egle Tomasi-Gustafsson, Tomasi-Gustafsson, Egle +3
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th

paper · pdf · doi:10.48550/arxiv.nucl-th/0010040

11 pages 2 figures XV Inernational Seminar on High Energy Physics Problems, Dubna, Russia, 25-29 Sept. 2000

arxiv created 2000/10/13 · openalex publication_date 2000/10/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We compare the existing data about electromagnetic form factors of the proton in the time-like region of momentum transfer (up to q²≃ 14 (GeV/c)²), with the corresponding data in the space-like region. From the constrains given by the Phragmèn-Lindelöf theorem, it turns out that the asymptotic regime can not be reached simultaneously for both form factors (electric and magnetic) in the considered region of momentum transfer. The angular dependence for the annihilation processes, such as p+p↔ e⁺+e^-, is sensitive to the asymptotic properties of form factors and to the two-photon physics in the time-like region.

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