Axial-vector form factors of the nucleon within the chiral quark-soliton model and their strange components

Silva, António; Kim, Hyun-Chul; Urbano, Diana; Goeke, K.

doi:10.1103/physrevd.72.094011

Cited by 48 publications

(80 citation statements)

References 48 publications

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“…The behavior is in agreement with the results reported in [4,44,47]. We compare the up and down quark charge densities for the transversely polarized and unpolarized nucleon in Figs.…”

Section: Transverse Charge and Magnetization Densitiessupporting

confidence: 80%

“…Transverse charge and magnetization densities in the nucleon's chiral periphery (i.e., at a distance b = O(1/m π )) using methods of dispersion analysis and chiral effective field theory have been analyzed in [46]. The transverse densities for the quarks are studied in a chiral quark-soliton model in [47]. Using a LaguerreGaussian expansion, Kelly [48] proposed a parametrization of the nucleon Sachs form factors in terms of charge and magnetization densities.…”

Section: Introductionmentioning

confidence: 99%

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Transverse charge and magnetization densities in holographic QCD

Chakrabarti

Mondal

2014

Eur. Phys. J. C

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We present a study of the flavor structures of the transverse charge and anomalous magnetization densities for both unpolarized and transversely polarized nucleons. We consider two different models for the electromagnetic form factors in holographic QCD. The flavor form factors are obtained by decomposing the Dirac and Pauli form factors for the nucleons using the charge and isospin symmetry. The results are compared with two standard phenomenological parametrizations.

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“…The behavior is in agreement with the results reported in [4,44,47]. We compare the up and down quark charge densities for the transversely polarized and unpolarized nucleon in Figs.…”

Section: Transverse Charge and Magnetization Densitiessupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Transverse charge and magnetization densities in holographic QCD

Chakrabarti

Mondal

2014

Eur. Phys. J. C

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“…One of the models, which yield a positive strange magnetic moment of the proton, is the chiral quark soliton model (χQSM). It will be used in the present paper to investigate the form factors G ) [19,28,29,30]. The results show a good agreement with the data of the SAMPLE, HAPPEX, A4 and G0 experiments.…”

supporting

confidence: 71%

Strange nucleon form factors: Solitonic approach to GM s , GE s , $ \tilde{{G}}_{{A}}^{{p}}$ and $ \tilde{{G}}_{{A}}^{{n}}$ and comparison with world data

et al. 2007

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Abstract.We summarize the results of the chiral quark-soliton model (χQSM) concerning basically all form factors necessary to interpret the present data of the parity violating electron scattering experiments SAMPLE, HAPPEX, A4 and G0. The results particularly focus on the recently measured asymmetries and the detailed data for various combinations ofThe calculations yield positive strange magnetic and electric form factors and a negative axial vector one, all being rather small. The results are very close to the combined experimental world data from parity violating electron scattering and elastic νp-andνp-scattering.

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“…The axial form factors of the octet baryons, including the nucleon, have been studied using constituent and chiral quark models [13,[25][26][27][28][29][30][31][32][33][34][35][36][37], based on the DysonSchwinger equations [38][39][40][41], models with meson cloud dressing [42][43][44][45][46][47][48][49][50][51][52][53][54], large-N C and chiral perturbation theory [5,[55][56][57][58][59][60][61][62][63][64][65] and QCD sum rules [66][67][68]. Recently, lattice QCD simulations for the nucleon became available for Q 2 = 0 [69][70][71]…”

Section: Introductionmentioning

confidence: 99%

Axial form factors of the octet baryons in a covariant quark model

Ramalho

Tsushima

2016

Phys. Rev. D

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We study the weak interaction axial form factors of the octet baryons, within the covariant spectator quark model, focusing on the dependence of four-momentum transfer squared, Q 2 . In our model the axial form factors GA(Q 2 ) (axial-vector form factor) and GP (Q 2 ) (induced pseudoscalar form factor), are calculated based on the constituent quark axial form factors and the octet baryon wave functions. The quark axial current is parametrized by the two constituent quark form factors, the axial-vector form factor g q A (Q 2 ), and the induced pseudoscalar form factor g q P (Q 2 ). The baryon wave functions are composed of a dominant S-state and a P -state mixture for the relative angular momentum of the quarks. First, we study in detail the nucleon case. We assume that the quark axial-vector form factor g q A (Q 2 ) has the same function form as that of the quark electromagnetic isovector form factor. The remaining parameters of the model, the P -state mixture and the Q 2 -dependence of g q P (Q 2 ), are determined by a fit to the nucleon axial form factor data obtained by lattice QCD simulations with large pion masses. In this lattice QCD regime the meson cloud effects are small, and the physics associated with the valence quarks can be better calibrated. Once the valence quark model is calibrated, we extend the model to the physical regime, and use the low Q 2 experimental data to estimate the meson cloud contributions for GA(Q 2 ) and GP (Q 2 ). Using the calibrated quark axial form factors, and the generalization of the nucleon wave function for the other octet baryon members, we make predictions for all the possible weak interaction axial form factors GA(Q 2 ) and GP (Q 2 ) of the octet baryons. The results are compared with the corresponding experimental data for GA(0), and with the estimates of baryon-meson models based on SU (6) symmetry.

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Axial-vector form factors of the nucleon within the chiral quark-soliton model and their strange components

Cited by 48 publications

References 48 publications

Transverse charge and magnetization densities in holographic QCD

Transverse charge and magnetization densities in holographic QCD

Strange nucleon form factors: Solitonic approach to GM s , GE s , $ \tilde{{G}}_{{A}}^{{p}}$ and $ \tilde{{G}}_{{A}}^{{n}}$ and comparison with world data

Axial form factors of the octet baryons in a covariant quark model

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