The electromagnetic form factors of the proton in the timelike region

Abstract

The reactions ppbar -> e+e- and e+e- -> ppbar are analyzed in the near-threshold region. Specific emphasis is put on the role played by the interaction in the initial- or final antinucleon-nucleon state which is taken into account rigorously. For that purpose a recently published NNbar potential derived within chiral effective field theory and fitted to results of a new partial-wave analysis of ppbar scattering data is employed. Our results provide strong support for the conjecture that the pronounced energy dependence of the e+e- <-> ppbar cross section, seen in pertinent experiments, is primarily due to the ppbar interaction. Predictions for the proton electromagnetic form factors G_E and G_M in the timelike region, close to the NNbar threshold, and for spin-dependent observables are presented. The steep rise of the effective form factor for energies close to the ppbar threshold is explained solely in terms of the ppbar interaction. The corresponding experimental information is quantitatively described by our calculation.

14 pages, 11 figures

References in corpus (11)

• Dispersion analysis of the nucleon form factors including meson continua
• Nucleon Electromagnetic Form Factors in the Timelike Region
• Time- and Spacelike Nucleon Electromagnetic Form Factors beyond Relativistic Constituent Quark Models
• Energy-dependent partial-wave analysis of all antiproton-proton scattering data below 925 MeV/c
• ppbar enhancement in B and J/Psi decay
• On the strong energy dependence of the e^+e^- to ppbar amplitude near threshold
• Rescattering Effect and Near Threshold Enhancement of $p\bar{p}$ System
• Model-independent extraction of two-photon effects in elastic electron-proton scattering
• Polarisation observables in lepton antilepton to proton antiproton reactions including lepton mass
• Helicity amplitudes and crossing relations for antiproton proton reactions
• Nucleon polarization in the process $e^{+}{e}^{-}\to N\bar{N}$ near threshold

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