Hyperon electromagnetic form factors in the timelike region

Haidenbauer, Johann; Meißner, Ulf-G.; Dai, Ling-Yun

doi:10.48550/arxiv.2011.06857

Cited by 4 publications

(9 citation statements)

References 35 publications

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“…This may indicated that there should be also other contributions around that energy region. For example, the electromagnetic form factors should be significantly influenced by the interaction in the final Σ + Σ − system [5]. However, since the experimental data are so limited, and we will leave those contributions to further study when more precise data are available.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…The study of the structure of hyperons which contain strange quark through their electromagnetic form factors (EMFFs) is crucial for deep understanding the nonperturbative quantum chromodynamics (QCD) effects that quarks are bounded in baryons [1][2][3][4][5]. As discussed in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Very recently, the EMFFs of hyperons are investigated in the timelike region through e + e − → Y Ȳ (Y is the hyperon) reaction [5], where the Y Ȳ final state interactions are taken into account, and the EMFFs in the timelike region are calculated for the Λ, Σ, and Ξ hyperons based on one-photon approximation for the elementary reaction mechanism. In Ref.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic form factors of $Σ^{+}$ and $Σ^{-}$ in the vector meson dominance model

Li,

Xie

2020

Preprint

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Based on the recently measurements of the e + e − → Σ + Σ− and e + e − → Σ − Σ+ processes by BESIII collaboration, the electromagnetic form factors of the hyperon Σ + and Σ − in the timelike region are investigated by using the vector meson dominance model, where the contributions from the ρ, ω, and φ mesons are taken into account. The model parameters are determined with the BESIII experimental data on the timelike effective form factors |G eff | of Σ + and Σ − baryons for center-of-mass energy from 2.3864 to 3.02 GeV. It is found that we can provide quantitative descriptions of available data as few as one adjustable model parameter. Then, we analytically continue the electromagnetic form factors to spacelike region and evaluate the spacelike form factors of hyperons Σ + and Σ − . The obtained electromagnetic form factors of the Σ + and Σ − baryons are comparable with other model calculations.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electromagnetic form factors of $Σ^{+}$ and $Σ^{-}$ in the vector meson dominance model

Li,

Xie

2020

Preprint

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“…In the last two decades, the EMFFs of hyperons (i.e., Λ, Σ, Ξ) in the time-like region have also been investigated. Particularly, the enhancement of the cross sections in reactions e + e − → Y Ȳ near threshold were measured and analyzed [20][21][22][23][24][25]. It is found that the vector mesons and their resonances, as the intermediate states of the reaction, play important roles in these processes.…”

Section: Introductionmentioning

confidence: 99%

The electromagnetic form factors of $Λ_c$ hyperon in the vector meson dominance model

Wan,

Yang,

2021

Preprint

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We applied a modified vector meson dominance (VMD) model to analyze the electromagnetic form factors of the Λ c hyperon in the time-like reaction e + e − → Λ + c Λ− c . In the model, we include the contributions from ω(782), ω(1420), ω(1650), φ(1020), φ(1680) and φ(2170), as well as charmed mesons and their resonance states ψ(1S ), ψ(2S ), ψ(3770), ψ(4040), ψ(4160) and ψ(4415). We perform a combined fit to the available data on the Born cross section in reaction e + e − → Λ + c Λ− c and the ratio of the electromagnetic form factors |G E /G M | to obtain the values of the model parameters. Our results show that the vector meson dominance model can simultaneously describe the data of electromagnetic form factors from the Bell and BESIII Collaboration, and the model result for |G E /G M | qualitatively agrees with the data from BESIII. With the fitted parameters, we predict the relative phase ∆Φ between G E and G M . Moreover, we predict the single and double polarization observables in e + e − → Λ + c Λ−c reactions, which are experimentally accessible in the polarized process. We also obtain the form factors of the Λ c hyperon in the space-like region via analytic continuing the time-like form factors.

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“…The first theoretical estimates of the e + e − → B B cross sections and hyperon effective form factor, in the timelike region, were based on vector meson dominance (VMD) models [69,70]. More recently, with the emergence of accurate data for a variety of hyperons, new models have been proposed [6,[71][72][73][74], including improved VMD models [75][76][77][78][79][80]. Most of these studies focus on the Λ and Σ systems.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic form factors of the $Ω^-$ baryon in the spacelike and timelike regions

Ramalho

2020

Preprint

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We present complete calculations of the electromagnetic form factors of the Ω − in the spacelike region and in the timelike region. The four elastic form factors: electric charge (GE0), magnetic dipole (GM1), electric quadrupole (GE2) and magnetic dipole (GM3), are estimated within the covariant spectator quark model, in terms of the square momentum transfer q 2 . The free parameters of the Ω − wave function, including a S-wave state and two independent D-wave states radial wave functions and the admixture coefficients are fixed by the comparison with the lattice QCD data in the spacelike region (Q 2 = −q 2 ≤ 0) and with the recent e + e − → Ω − Ω+ data from CLEO in the timelike region (q 2 > 0). The estimates in the timelike region for square momentum transfer q 2 ≥ 4M 2 Ω , are based on large-q 2 asymptotic relations (MΩ is the Ω − mass). We examine also the impact of the large-Q 2 correlations between different form factors, and analyze the possible solutions. The electric quadrupole and the magnetic octupole moments of the Ω − , and the e + e − → Ω − Ω+ integrated cross sections for very large q 2 are estimated based on the model results.

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Hyperon electromagnetic form factors in the timelike region

Cited by 4 publications

References 35 publications

Electromagnetic form factors of $Σ^{+}$ and $Σ^{-}$ in the vector meson dominance model

Electromagnetic form factors of $Σ^{+}$ and $Σ^{-}$ in the vector meson dominance model

The electromagnetic form factors of $Λ_c$ hyperon in the vector meson dominance model

Electromagnetic form factors of the $Ω^-$ baryon in the spacelike and timelike regions

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