Holographic estimate of the meson cloud contribution to nucleon axial form factor

Ramalho, G.

doi:10.1103/physrevd.97.073002

Cited by 9 publications

(5 citation statements)

References 140 publications

(309 reference statements)

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“…We refer to the articles [51,52] for a review of experimental data on the nucleon axial FFs. The axial FFs can be extracted using various theoretical approaches [53][54][55][56][57][58][59][60][61]. In recent years, lattice QCD simulations of axial FFs have been reported for pion masses in the range 0.2 − 0.6 GeV [62][63][64][65][66][67][68][69], while in a very recent study, the lattice QCD calculation of nucleon axial FF in 2 + 1 flavor near the physical pion mass has been presented by the PACS Collaboration [70].…”

Section: Introductionmentioning

confidence: 99%

Nucleon structure from basis light-front quantization

Xu,

Mondal,

Lan

et al. 2021

Preprint

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We produce the light-front wave functions (LFWFs) of the nucleon from a basis light-front approach in the leading Fock sector representation. We solve for the mass eigenstates from a light-front effective Hamiltonian, which includes a confining potential adopted from light-front holography in the transverse direction, a longitudinal confinement, and a one-gluon exchange interaction with fixed coupling. We then employ the LFWFs to obtain the electromagnetic and axial form factors, the parton distribution functions (PDFs) and the generalized parton distribution functions for the nucleon. The electromagnetic and axial form factors of the proton agree with the experimental data, whereas the neutron form factors deviate somewhat from the experiments in the low momentum transfer region. The unpolarized, the helicity, and the transversity valence quark PDFs, after QCD scale evolution, are fairly consistent with the global fits to the data at the relevant experimental scales. The helicity asymmetry for the down quark also agrees well with the measurements, however, the asymmetry for the up quark shows a deviation from the data, especially in the small x region. We also find that the tensor charge agrees well with the extracted data and the lattice QCD predictions, while the axial charge is somewhat outside the experimental error bar. The electromagnetic radii of the proton, the magnetic radius of the neutron, and the axial radius are in excellent agreement with the measurements, while the neutron charge radius deviates from experiment.

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Section: Introductionmentioning

confidence: 99%

Nucleon structure from basis light-front quantization

Xu,

Mondal,

Lan

et al. 2021

Preprint

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“…As mentioned, FFs can be written in terms of GPDs, and hence their measurements can give us useful important information on GPDs. In the case of nucleon spin studies, AFFs which are related to polarized GPDs can be extracted using various approaches [37][38][39][40][41][42][43][44]. One can find a review of experimental data in Refs.…”

Section: Introductionmentioning

confidence: 99%

Nucleon axial form factor from generalized parton distributions

2019

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It is well established that the nucleon form factors can be related to Generalized Parton Distributions (GPDs) through sum-rules. On the other hand, GPDs can be expressed in terms of Parton Distribution Functions (PDFs) according to Diehl's model. In this work, we use this model to calculate polarized GPDs for quarks ( Hq) using the available polarized PDFs obtained from the experimental data, and then study the axial form factor of nucleon. We determine parameters of the model using standard χ 2 analysis of experimental data. It is shown that some parameters should be readjusted, as compared to some previously reported values, to obtain better consistency between the theoretical predictions and experimental data. Moreover, we study in details the uncertainty of nucleon axial form factor due to various sources.

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“…For example, the vector form factors provide the charge and electromagnetic hadron structure and interactions, the nucleon axial form factor provides important information for their spin structure and weak interaction observables such as neutron beta decay or CKM matrix unitarity. There are many theoretical calculations for the light hadrons strong form factors, for example [6,7,8,9,10,11,18,12,13,14,15,16,17] and references therein. Lattely, lattice estimations for pion-nucleon/baryons interactions were provided for progressively lower values of the pion mass, for example in [17,10,18].…”

Section: Introductionmentioning

confidence: 99%

Pion constituent quark couplings strong form factors: A dynamical approach

Braghin

2019

Phys. Rev. D

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Form factors for pions interactions with constituent quarks are investigated as the leading effective couplings obtained from a one loop background field method applied to a global color model. Two pion field definitions are considered and the resulting eleven form factors are expressed in terms of components of the quark and gluon propagators that compose only two momentum dependent functions. A momentum dependent Goldberger Treiman relation is also obtained as one of the ratios between the form factors. The resulting form factors with pion momenta up to 1.5 GeV are exhibitted for different quark effective masses and two different nonperturbative gluon propagators and they present similar behavior to fittings of experimental data from nucleons form factors. The corresponding pseudoscalar averaged quadratic radii (a.q.r.) and correction to the axial a.q.r. are presented as functions of the sea quark effective mass, being equal respectively to the scalar and vector ones at the present level of calculation.

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Holographic estimate of the meson cloud contribution to nucleon axial form factor

Cited by 9 publications

References 140 publications

Nucleon structure from basis light-front quantization

Nucleon structure from basis light-front quantization

Nucleon axial form factor from generalized parton distributions

Pion constituent quark couplings strong form factors: A dynamical approach

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