Helicity-dependent generalized parton distributions for nonzero skewness

Mondal, Chandan

doi:10.1140/epjc/s10052-017-5203-0

Cited by 25 publications

(5 citation statements)

References 97 publications

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“…The peaks of these GPDs move toward higher values of x and simultaneously reduce the magnitudes with increasing the value of the momentum transfer −t. This seems to be a model independent behavior of the GPDs, which has also been observed in quark GPDs evaluated within this HLFQCD framework [28] as well as in various phenomenological models for the nucleon [79][80][81][82][83][84][85][86][87][88][89]. We notice that the unpolarized gluon GPD falls faster than the polarized gluon GPD with increasing value of −t.…”

Section: Gluon Gpdssupporting

confidence: 76%

Polarized gluon distribution in the proton from holographic light-front QCD

Gurjar¹,

Mondal²,

Chakrabarti³

2022

Preprint

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We obtain the gluon parton distribution functions (PDFs) in the proton within the extended light-front holographic QCD framework, where the proton couples with the spin-two Pomeron in Anti-de Sitter space, together with constraints imposed by the Veneziano model. The gluon helicity asymmetry, after satisfying the perturbative QCD constraints at small and large longitudinal momentum regions, agrees with existing experimental measurements. The polarized gluon distribution is consistent with global analyses. We predict the gluon helicity contribution to the proton spin, ∆G = 0.221 +0.009 −0.010 , close to the recent analysis with updated data sets and PHENIX measurement and the lattice QCD simulations. We also present the unpolarized and polarized gluon generalized parton distributions.

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Section: Gluon Gpdssupporting

confidence: 76%

Polarized gluon distribution in the proton from holographic light-front QCD

Gurjar¹,

Mondal²,

Chakrabarti³

2022

Preprint

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“…We have taken the quark to be massless and all parameters are set in accordance with the electromagnetic properties of the nucleons. The parameters used in this model are taken from [8].…”

Section: Light-front Quark-diquark Modelmentioning

confidence: 99%

Proton gravitational form factors in a light-front quark-diquark model

Chakrabarti¹,

Mondal²,

Mukherjee³

et al. 2022

SciPost Phys. Proc.

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We present a recent calculation of the gravitational form factors (GFFs) of proton using the light-front quark-diquark model constructed by the soft-wall AdS/QCD[1]. The four GFFs ~A(Q^2)A(Q2) , B(Q^2)B(Q2) , C(Q^2)C(Q2) and \bar{C}(Q^2)C‾(Q2) are calculated in this model. We also show the pressure and shear distributions of quarks inside the proton. The GFFs, A(Q^2)A(Q2) and B(Q^2)B(Q2) are found to be consistent with the lattice QCD, while the qualitative behavior of the DD-term form factor is in agreement with the extracted data from the deeply virtual Compton scattering (DVCS) experiments at JLab, the lattice QCD, and the predictions of different phenomenological models.

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“…One can also obtain effective lightfront wave functions (LFWFs) [28,55] which are relevant for the computation of FFs and PDFs, including polarization dependent distributions [43,44,47]. LFWFs are also used to study the skewness ξ-dependence of the GPDs [41,45,48,50,51], and other parton distributions such as the Wigner distribution functions [38,43]. The downside of the above phenomenological extensions of the holographic model is the large number of parameters required to describe simultaneously PDFs and FFs for each flavor.…”

Section: Introductionmentioning

confidence: 99%

Universality of Generalized Parton Distributions in Light-Front Holographic QCD

et al. 2018

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The structure of generalized parton distributions is determined from light-front holographic QCD up to a universal reparametrization function w(x) which incorporates Regge behavior at small x and inclusive counting rules at x→1. A simple ansatz for w(x) that fulfills these physics constraints with a single-parameter results in precise descriptions of both the nucleon and the pion quark distribution functions in comparison with global fits. The analytic structure of the amplitudes leads to a connection with the Veneziano model and hence to a nontrivial connection with Regge theory and the hadron spectrum.

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Helicity-dependent generalized parton distributions for nonzero skewness

Cited by 25 publications

References 97 publications

Polarized gluon distribution in the proton from holographic light-front QCD

Polarized gluon distribution in the proton from holographic light-front QCD

Proton gravitational form factors in a light-front quark-diquark model

Universality of Generalized Parton Distributions in Light-Front Holographic QCD

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