Form factors for the Nucleon-to-Roper electromagnetic transition at large-<i>Q</i><sup>2</sup>

Rodríguez-Quintero, J.; Binosi, Daniele; Chen, Ch.; Lu, Ya Lin; Roberts, Craig D.; Segovia, Segovia

doi:10.1051/epjconf/202024102009

Cited by 6 publications

(3 citation statements)

References 50 publications

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“…First predictions of the Q 2 evolution for the γ v nN * electrocouplings and a light-quark flavor separation have become available in the continuum QCD approach [37,38]. A successful description of the measured γ v N N * electrocouplings off free protons and quasifree neutrons with the same dressed quark mass function will further validate the credible insight into the hadron mass generation dynamics.…”

Section: Introductionmentioning

confidence: 95%

Exclusive π− electroproduction off the neutron in deuterium in the resonance region

Tian¹,

Gothe²,

Mokeev³

et al. 2023

Phys. Rev. C

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New results for the exclusive and quasifree cross sections off neutrons bound in deuterium γvn(p) → pπ − (p) are presented over a wide final state hadron angle range with a kinematic coverage of the invariant mass (W ) up to 1.825 GeV and the four-momentum transfer squared (Q 2 ) from 0.4 to 1.0 GeV 2 . The exclusive structure functions were extracted and their Legendre moments were obtained. Final-state-interaction contributions have been kinematically separated from the extracted quasifree cross sections off bound neutrons solely based on the analysis of the experimental data. These new results will serve as long-awaited input for phenomenological analyses to extract the Q 2 evolution of previously unavailable n → N * electroexcitation amplitudes and to improve state-of-the-art models of neutrino scattering off nuclei by augmenting the already available results from free protons.

show abstract

Section: Introductionmentioning

confidence: 95%

Exclusive π− electroproduction off the neutron in deuterium in the resonance region

Tian¹,

Gothe²,

Mokeev³

et al. 2023

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…First predictions of the Q 2 evolution for the γ v nN * electrocouplings and a light-quark flavor separation have become available in the continuum QCD approach [37,38]. A successful description of the measured γ v N N * electrocouplings off free protons and quasi-free neutrons with the same dressed quark mass function will further validate the credible insight into the hadron mass generation dynamics.…”

Section: Introductionmentioning

confidence: 95%

Exclusive $π^{-}$ Electroproduction off the Neutron in Deuterium in the Resonance Region

Tian,

Gothe,

Mokeev

et al. 2022

Preprint

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New results for the exclusive and quasi-free cross sections off neutrons bound in deuterium γvn(p) → pπ − (p) are presented over a wide final state hadron angle range with a kinematic coverage of the invariant mass (W ) up to 1.825 GeV and the virtual photon four-momentum transfer squared (Q 2 ) from 0.4 to 1.0 GeV 2 . The exclusive structure functions have been extracted and their Legendre moments were obtained. Final-state-interaction contributions have been kinematically separated from the extracted quasi-free cross sections off bound neutrons solely based on the analysis of the experimental data. These new results will serve as long-awaited input for phenomenological analyses to extract the Q 2 evolution of previously unavailable n → N * electroexcitation amplitudes and to improve state-of-the-art models of neutrino scattering off nuclei by augmenting the already available results from free protons.

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“…Comparing with the available experimental data, using the phenomenological models, the framework of GPDs are well built now, providing a three-dimensional picture of the hadrons [4,6]. GPDs provide more than the ordinary parton distribution functions (PDFs) [17][18][19][20][21][22][23][24][25][26] and form factors (FFs) [27][28][29][30][31][32] in understanding the internal structure of hadrons. Besides the longitudinal-momentum fraction x and the momentum transfer q 2 , GPDs also depend on the skewness parameter ξ .…”

mentioning

confidence: 99%

Kaon generalized parton distributions and light-front wave functions in the Nambu–Jona-Lasinio model

Zhang

Ping

2021

Eur. Phys. J. C

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Kaon generalized parton distributions (GPDs) and the leading Fock state light-front wave functions are investigated in the framework of Nambu–Jona-Lasinio model with proper time regularization. In addition, we compared the form factors, parton distribution functions, and generalized form factors obtained from them, respectively. The first Mellin moments of GPDs result in the form factors of local currents. The second Mellin moments of vector GPDs are related to gravitational form factors, the quark mass distribution $$\theta _2$$ θ 2 and the quark pressure distribution $$\theta _1$$ θ 1 . When taking a Fourier transform of GPDs in impact parameter space, we can get the mean-squared impact parameter for the quarks of the kaon: $$\langle {\varvec{b}}_{\bot }^2\rangle _K^u=0.149$$ ⟨ b ⊥ 2 ⟩ K u = 0.149 fm$$^2$$ 2 , $$\langle {\varvec{b}}_{\bot }^2\rangle _K^s=0.088$$ ⟨ b ⊥ 2 ⟩ K s = 0.088 fm$$^2$$ 2 . This means that the kaon s quark is nearer to the center of transverse momentum than the u quark. We also give the light-cone energy radius for the quarks of the kaon from the mass distribution $$\theta _2$$ θ 2 : $$r_{E,LC}^{u,K}=0.187 $$ r E , L C u , K = 0.187 fm, $$ r_{E,LC}^{s,K}=0.167$$ r E , L C s , K = 0.167 fm, and the light-cone charge radius from quark form factors of the kaon: $$r_{c,LC}^{u,K}=0.390 $$ r c , L C u , K = 0.390 fm, $$r_{c,LC}^{s,K}=0.296 $$ r c , L C s , K = 0.296 fm, which means that the s quark has a smaller extent than the u quark. The light-front transverse-spin distributions $$\rho _u^1\left( {\varvec{b}}_{\bot },{\varvec{s}}_{\perp }\right) $$ ρ u 1 b ⊥ , s ⊥ and $$\rho _u^2\left( {\varvec{b}}_{\bot },{\varvec{s}}_{\perp }\right) $$ ρ u 2 b ⊥ , s ⊥ show distortions, the average shift are $$\langle b_{\bot }^y\rangle _1^u=0.116$$ ⟨ b ⊥ y ⟩ 1 u = 0.116 fm and $$\langle b_{\bot }^y\rangle _2^u=0.083$$ ⟨ b ⊥ y ⟩ 2 u = 0.083 fm. On the kinematic domain associated with the valence-quark dominance, the unpolarized Wigner distribution from light-front wave functions is sharply peaked. It extends as the transverse position variable increases in magnitude and has a domain of negative support. Through the comparison of distributions from the two methods, we find that they give the same multi-dimensional mapping of the kaon in the Nambu–Jona-Lasinio model.

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Form factors for the Nucleon-to-Roper electromagnetic transition at large-Q²

Cited by 6 publications

References 50 publications

Exclusive π− electroproduction off the neutron in deuterium in the resonance region

Exclusive π− electroproduction off the neutron in deuterium in the resonance region

Exclusive $π^{-}$ Electroproduction off the Neutron in Deuterium in the Resonance Region

Kaon generalized parton distributions and light-front wave functions in the Nambu–Jona-Lasinio model

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Form factors for the Nucleon-to-Roper electromagnetic transition at large-Q2

Cited by 6 publications

References 50 publications

Exclusive π− electroproduction off the neutron in deuterium in the resonance region

Exclusive π− electroproduction off the neutron in deuterium in the resonance region

Exclusive $π^{-}$ Electroproduction off the Neutron in Deuterium in the Resonance Region

Kaon generalized parton distributions and light-front wave functions in the Nambu–Jona-Lasinio model

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About

Form factors for the Nucleon-to-Roper electromagnetic transition at large-Q²