Vector-meson - nucleon couplings at spacelike momentum transfer

Gari, M.; Krümpelmann, W.

doi:10.1103/physrevd.45.1817

Cited by 36 publications

(43 citation statements)

References 17 publications

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“…Vector-meson-dominance models being consistent with pQCD-predictions are well known to give a satisfactory description of existing experimental data on elastic eNscattering [50,51,52,53,54,55,56,60]. The universal physical ground of VMD allows to apply its principles to physics of the transition form factors.…”

Section: A Origin Of the Modelmentioning

confidence: 93%

“…The universal physical ground of VMD allows to apply its principles to physics of the transition form factors. But the VMD models currently in use are suffering the drawback of taking into account solely the ground-state vector mesons ρ(770), ω(782), φ(1020) [50,51,52,53,54] and seldom ρ(1450) [55,56] and ω(1420) [56]. This cut-off of the meson spectrum is usually motivated by the data on decay widths Γ(V → e − e + ) testifying a photon to hadronize dominantly into the above mesons [50].…”

Section: A Origin Of the Modelmentioning

confidence: 99%

“…The choice of the vector-meson spectrum. The majority of the models take into account only the lightest vector mesons ρ(770), ω(782), φ(1020) [50,51,52,53,54,60] and seldom ρ(1450) [55,56], ω(1420) [56]. Only the model [60] includes all the vector mesons reported by experimentalists before its publication.…”

Section: Introductionmentioning

confidence: 99%

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Q2-evolution of nucleon-to-resonance transition form factors in a QCD-inspired vector-meson-dominance model

Vereshkov

Volchanskiy

2007

Phys. Rev. D

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We adopt the vector-meson-dominance approach to investigate Q 2 -evolution of N R-transition form factors (N denotes nucleon and R an excited resonance) in the first and second resonance regions. The developed model is based upon conventional γN R-interaction Lagrangians, introducing three form factors for spin-3/2 resonances and two form factors for spin-1/2 nucleon excitations. Lagrangian form factors are expressed as dispersionlike expansions with four or five poles corresponding to the lowest excitations of the mesons ρ(770) and ω(782). Correct high-Q 2 form factor behavior predicted by perturbative QCD is due to phenomenological logarithmic renormalization of electromagnetic coupling constants and linear superconvergence relations between the parameters of the meson spectrum. The model is found to be in good agreement with all the experimental data on Q 2 -dependence of the transitions N ∆(1232), N N (1440), N N (1520), N N (1535). We present fit results and model predictions for high-energy experiments proposed by JLab. Besides, we make special emphasis on the transition to perturbative domain of N ∆(1232) form factors.

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Section: A Origin Of the Modelmentioning

confidence: 93%

Section: A Origin Of the Modelmentioning

confidence: 99%

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Q2-evolution of nucleon-to-resonance transition form factors in a QCD-inspired vector-meson-dominance model

Vereshkov

Volchanskiy

2007

Phys. Rev. D

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“…We used the cc1 vertex function of de Forest [40] with nucleon form factors from model 3 of Gari and Krümpelmann [41,42]. Current conservation was enforced at the one-body level by eliminating the longitudinal in favor of the charge component.…”

Section: Distorted Wave Approximationmentioning

confidence: 99%

Nuclear transparency to intermediate-energy protons

Kelly

1996

Phys. Rev. C

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Nuclear transparency in the (e, e ′ p) reaction for 135 ≤ T p ≤ 800 MeV is investigated using the distorted wave approximation. Calculations using densitydependent effective interactions, both empirical and theoretical, are compared with phenomenological optical potentials. We find that nuclear transparency is well correlated with proton absorption and neutron total cross sections and that calculations using density-dependent effective interactions provide the best agreement with data. Nuclear transparency calculations are compared with recent electron scattering data for Q 2 < 2 (GeV/c) 2 . For T p < ∼ 200 MeV we find that there is considerable sensitivity to the choice of optical model and that the empirical effective interaction provides the best agreement with the data, but remains 5-10% low. For T p > ∼ 300 MeV we find that there is much less difference between these models, but that the calculations significantly underpredict transparency data and that the discrepancy increases with A. The differences between Glauber and optical model calculations are related to their respective definitions of the semi-inclusive cross section. By using a more inclusive summation over final states the Glauber model emphasizes nucleonnucleon inelasticity, whereas with a more restrictive summation the optical model emphasizes nucleon-nucleus inelasticity; experimental definitions of the semi-inclusive cross section lie between these extremes.

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“…It has been argued since a long time that in particular the neutron electric form factor might be particularly sensitive to strange quark effects, for an early reference see e.g. [5]. Furthermore, the strange magnetic ff was recently investigated using chiral perturbation theory and a leading one loop prediction free of adjustable parameters could be made [6].…”

mentioning

confidence: 99%

Baryon form factors

Kubis¹,

Hemmert²,

Meißner³

1999

Physics Letters B

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We calculate the form factors of the baryon octet in the framework of heavy baryon chiral perturbation theory. The calculated charge radius of the Σ − is in agreement with recent measurements from CERN and Fermilab. We show that kaon loop effects can play a significant role in the neutron electric form factor. Furthermore, we derive generalized Caldi-Pagels relations between various charge radii which are free of chiral loop effects.

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Vector-meson - nucleon couplings at spacelike momentum transfer

Cited by 36 publications

References 17 publications

Q2-evolution of nucleon-to-resonance transition form factors in a QCD-inspired vector-meson-dominance model

Q2-evolution of nucleon-to-resonance transition form factors in a QCD-inspired vector-meson-dominance model

Nuclear transparency to intermediate-energy protons

Baryon form factors

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