Proton Electromagnetic Form Factors in the Time-like Region through the Scan Technique

Abstract

For over 100 years, scientists have investigated the properties of the proton, which is one of the most abundant components of visible matter in the universe. Nevertheless, researchers do not fully understand many details about its internal structure and dynamics. Time-like electromagnetic form factors are one of the observable quantities that can help us achieve a deeper understanding. In this review article, we present an overview of the current experimental status in this field, consisting of measurements of the time-like reactions $e^{+}{e}^{-}\to p\bar{p}$, $p\bar{p}\to e^{+}{e}^{-}$, and future measurements of $p\bar{p}\to {\mu }^{+}{\mu }^{-}$. A focus is put on recent high precision results of the reaction $e^{+}{e}^{-}\to p\bar{p}$ that have been obtained after analyzing 688.5~pb${}^{-1}$ of data taken at the BESIII experiment. They are compared and put into perspective to results from previous measurements in this channel. We discuss the channels $p\bar{p}\to e^{+}{e}^{-}$ and $p\bar{p}\to {\mu }^{+}{\mu }^{-}$ in terms of the few existing as well as future measurements, which the PANDA experiment will perform. Finally, we review several new theoretical models and phenomenological approaches inspired by the BESIII high precision results and then discuss their implications for a deeper understanding of the proton's structure and inner dynamics.

References in corpus (32)

• Measurement of GEp/GMp in ep -> ep to Q2 = 5.6 GeV2
• Proton elastic form factor ratios to $Q^2$ = 3.5 GeV${}^2$ by polarization transfer
• Study of e+e- --> p anti-p via initial-state radiation at BABAR
• The size of the proton - closing in on the radius puzzle
• Precision Measurements of the Timelike Electromagnetic Form Factors of Pion, Kaon, and Proton
• Measurement of proton electromagnetic form factors in $e^{+}{e}^{-}\to p\bar{p}$ in the energy region 2.00-3.08 GeV
• New Features in the Electromagnetic Structure of the Neutron
• Polarization Transfer Observables in Elastic Electron Proton Scattering at $Q^2=$2.5, 5.2, 6.8, and 8.5 GeV${}^2$
• Measurement of the proton form factor by studying $e^{+}{e}^{-}\to p\bar{p}$
• Nucleon Electromagnetic Form Factors in the Timelike Region
• Unexpected features of e+e-->ppbar and e+e-->lambda-lambdabar cross sections near threshold
• Measurement of the e+e- --> p anti-p cross section in the energy range from 3.0 to 6.5 GeV
• Study of the process $e^{+}{e}^{-}\to p\bar{p}$ in the c.m. energy range from threshold to 2 GeV with the CMD-3 detector
• Glue spin and helicity in proton from lattice QCD
• Periodic interference structures in the time-like proton form factor
• A measurement of the CP-conserving component of the decay KS -> pi+ pi- pi0
• Measurement of the cross section for e^+e^- -> ppbar at center-of-mass energies from 2.0 to 3.07 GeV
• Time- and Spacelike Nucleon Electromagnetic Form Factors beyond Relativistic Constituent Quark Models
• Measurement of proton electromagnetic form factors in the time-like region using initial state radiation at BESIII
• Dispersion-theoretical analysis of the electromagnetic form factors of the nucleon: Past, present and future
• Time-like and space-like electromagnetic form factors of nucleons, a unified description
• Study of the process $e^{+}{e}^{-}\to p\bar{p}$ via initial state radiation at BESIII
• New structures in the proton-antiproton system
• Observation of a Fine Structure in $e^{+}{e}^{-}\to$ hadrons Production at the Nucleon-antinucleon Threshold
• A model for space and time-like proton (neutron) form factors
• Phenomenological analysis of near threshold periodic modulations of the proton timelike form factor
• New fit of time-like proton electromagnetic form factors from $e^{+}{e}^{-}$ colliders
• Probing the internal structure of baryons
• No Sommerfeld resummation factor in e+e- -> ppbar ?
• A description of the ratio between electric and magnetic proton form factors by using space-like, time-like data and dispersion relations
• Threshold resummation $S$-factor in QCD: the case of unequal masses
• The fourth dimension of the nucleon structure: spacetime analysis of the timelike electromagnetic proton form factors

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