Time-like compton scattering and the Bethe-Heitler process
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Arguments are presented for p(γ,e+e–)p measurements to obtain new information about the off-shell time-like nucleon form factors, especially in the φ meson region governing the φ N couplings gV,T φ N N . Theoretical predictions based upon a Quantum Hadrodynamic model and vector meson dominance are highlighted for both the proton form factor and the time-like Compton scattering cross section. The Bethe-Heitler process is also calculated but is only important at low momentum transfer |t| permitting a novel high |t| φ enhancement in the Compton cross section related to nucleon strangeness to emerge.
PACS: 12.40.Nn Regge theory – 12.40.Vv Vector-meson dominance – 13.40.Gp Electromagnetic form factors – 13.40.Hq Electromagnetic decays