On the electromagnetic form factors of hadrons in the time-like region near threshold

Abstract

Hadron electromagnetic form factor in the time-like region at the boundary of the physical region is considered. The energy behavior of the form factor is shown to be determined by the strong hadron-antihadron interaction. Imaginary parts of the scattering lengths for $p\bar{p}$, $\Lambda \bar{\Lambda }$, $\Lambda {\bar{\Sigma }}^0(\bar{\Lambda }{\Sigma }^0)$ and ${\Sigma }^0{\bar{\Sigma }}^0$ are estimated. Developed approach enables us to estimate imaginary part of the scattering volume from $D^{\ast }\overline{D^{\ast }}$ experimental data. The form factor energy behavior away from the threshold is obtained within a semiphenomenological model of hadron-antihadron interaction.

17 pages 6 figures

References in corpus (6)

• Study of e+e- --> Lambda anti-Lambda, Lambda anti-Sigma0, Sigma0 anti-Sigma0 using Initial State Radiation with BABAR
• Unexpected features of e+e-->ppbar and e+e-->lambda-lambdabar cross sections near threshold
• Paris nucleon-antinucleon potential constrained by recent antiprotonic-atom data and antineutron-proton total cross sections
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Cited by in corpus (27)

• Study of e+e- --> p anti-p via initial-state radiation at BABAR
• Precision measurement of the $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ cross section near threshold
• The electromagnetic form factors of the proton in the timelike region
• Nucleon Electromagnetic Form Factors in the Timelike Region
• First Measurements of Timelike Form Factors of the Hyperons, Lambda0, Sigma0, Sigma+, Xi0, Xi-, and Omega-, and Evidence of Diquark Correlations
• The electromagnetic form factors of the $\Lambda$ in the timelike region
• Dispersion-theoretical analysis of the electromagnetic form factors of the nucleon: Past, present and future
• Polarization observables in the $e^{+}{e}^{-}\to \bar{\Lambda }\Lambda$ reaction
• The electromagnetic form factors of $\Lambda$ hyperon in the vector meson dominance model
• Hyperon electromagnetic form factors in the timelike region
• Measurement of cross-section for $e^{+}{e}^{-}\to {\Xi }^{-}{\bar{\Xi }}^{+}$ near threshold at BESIII
• Measurement of cross section for $e^{+}{e}^{-}\to {\Xi }^0{\bar{\Xi }}^0$ near threshold
• Hyperon electromagnetic timelike elastic form factors at large $q^2$
• Probing the internal structure of baryons
• No Sommerfeld resummation factor in e+e- -> ppbar ?
• A possible explanation of the threshold enhancement in the process $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$
• Basis light-front quantization approach to $\Lambda$ and ${\Lambda }_c$ and their isospin triplet baryons
• Electromagnetic form factors of the ${\Omega }^{-}$ baryon in the spacelike and timelike regions
• Toy model to understand oscillatory behavior in timelike nucleon form factors
• Study of $e^{+}{e}^{-}\to {\Omega }^{-}{\bar{\Omega }}^{+}$ at center-of-mass energies from 3.49 to 3.67 GeV
• Study of $e^{+}{e}^{-}\to {\Sigma }^0\overline{\Sigma }{}^0$ and ${\Sigma }^{+}\overline{\Sigma }{}^{-}$ by Initial State Radiation Method at Belle
• Dispersion-theoretical analysis of the electromagnetic form factors of the $\Lambda$ hyperon
• Measurement of $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }\eta$ from 3.5106 to 4.6988 GeV and study of $\Lambda \bar{\Lambda }$ mass threshold enhancement
• $\Lambda \bar{\Lambda }$ final-state interaction in the reactions $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$ and $e^{+}{e}^{-}\to \eta \Lambda \bar{\Lambda }$
• The electromagnetic form factors of $\Lambda$ hyperon in $e^{+}{e}^{-}\to \bar{\Lambda }\Lambda$
• Soft rescattering in the timelike proton form factor within a spacetime scheme
• Theory of time-like baryon form factors near thresholds