The electromagnetic form factors of the $\Lambda$ in the timelike region

Abstract

The reaction $e^{+}{e}^{-}\to \bar{\Lambda }\Lambda$ is investigated for energies close to the threshold. Specific emphasis is put on the role played by the interaction in the final $\bar{\Lambda }\Lambda$ system which is taken into account rigorously. For that interaction a variety of $\bar{\Lambda }\Lambda$ potential models is employed that have been constructed for the analysis of the reaction $\bar{p}p\to \bar{\Lambda }\Lambda$ in the past. The enhancement of the effective form factor for energies close to the $\bar{\Lambda }\Lambda$ threshold, seen in pertinent experiments, is reproduced. Predictions for the $\Lambda$ electromagnetic form factors $G_M$ and $G_E$ in the timelike region and for spin-dependent observables such as spin-correlation parameters are presented.

8 pages, 4 figures

References in corpus (10)

• Observation of a near-threshold enhancement in the e+e- -->Lambda_c+Lambda_c- cross section using initial-state radiation
• The electromagnetic form factors of the proton in the timelike region
• Measurement of the proton form factor by studying $e^{+}{e}^{-}\to p\bar{p}$
• Study of the process $e^{+}{e}^{-}\to n\bar{n}$ at the VEPP-2000 $e^{+}{e}^{-}$ collider with the SND detector
• Nucleon Electromagnetic Form Factors in the Timelike Region
• Unexpected features of e+e-->ppbar and e+e-->lambda-lambdabar cross sections near threshold
• First Measurements of Timelike Form Factors of the Hyperons, Lambda0, Sigma0, Sigma+, Xi0, Xi-, and Omega-, and Evidence of Diquark Correlations
• Energy-dependent partial-wave analysis of all antiproton-proton scattering data below 925 MeV/c
• On the strong energy dependence of the e^+e^- to ppbar amplitude near threshold
• Polarisation observables in lepton antilepton to proton antiproton reactions including lepton mass

Cited by in corpus (25)

• PANDA Phase One
• The BESIII Physics Programme
• Hyperon electromagnetic form factors in the timelike region
• Entangled baryons: violation of Inequalities based on local realism assuming dependence of decays on hidden variables
• Re-examining the $X(4630)$ resonance in the reaction $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$
• Probing the internal structure of baryons
• The potential of $\Lambda$ and ${\Xi }^{-}$ studies with PANDA at FAIR
• Electromagnetic form factors of $\Lambda$ hyperon in the vector meson dominance model and a possible explanation of the near-threshold enhancement of the $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$ reaction
• Basis light-front quantization approach to $\Lambda$ and ${\Lambda }_c$ and their isospin triplet baryons
• $N\bar{N}$ production in $e^{+}{e}^{-}$ annihilation near the threshold revisited
• Electromagnetic form factors of the ${\Omega }^{-}$ baryon in the spacelike and timelike regions
• Electromagnetic form factors of neutron and neutral stange hyperons in the oscillating view of point
• New insights into the oscillation of the nucleon electromagnetic form factors
• Study of $e^{+}{e}^{-}\to {\Sigma }^0\overline{\Sigma }{}^0$ and ${\Sigma }^{+}\overline{\Sigma }{}^{-}$ by Initial State Radiation Method at Belle
• Electromagnetic form factors of ${\Lambda }_b$ in the Bethe-Salpeter equation approach
• Electromagnetic $|G_E/G_M|$ ratios of hyperons at large timelike $q^2$
• Dispersion-theoretical analysis of the electromagnetic form factors of the $\Lambda$ hyperon
• The electromagnetic Sigma-to-Lambda transition form factors with coupled-channel effects in the space-like region
• Higher strangeonium decays into light flavor baryon pairs like $\Lambda \bar{\Lambda }$, $\Sigma \bar{\Sigma }$, and $\Xi \bar{\Xi }$
• Natural explanation of recent results on $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$
• Coupled channels and production of near-threshold $B^{(\ast )}{\bar{B}}^{(\ast )}$ resonances in $e^{+}{e}^{-}$ annihilation
• The electromagnetic form factors of ${\Lambda }_c$ hyperon in the vector meson dominance model
• Space-like Electromagnetic Form Factors of Lambda- and Sigma-Baryons from Quark-Diquark Faddeev Equations
• $\Lambda \bar{\Lambda }$ final-state interaction in the reactions $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$ and $e^{+}{e}^{-}\to \eta \Lambda \bar{\Lambda }$
• Near-threshold resonance in $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$ process