Dipankar Chakrabarti

Generalized parton distributions and transverse densities in a light-front quark-diquark model for the nucleons

We present a study of the generalized parton distributions (GPDs) for the quarks in a proton in both momentum and position spaces using the light-front wave functions (LFWFs) of a quark–diquark model for the nucleon predicted by the soft-wall model of AdS/QCD. The results are compared with the soft-wall AdS/QCD model of proton GPDs for zero skewness. We also calculate the GPDs for nonzero skewness. We observe that the GPDs have a diffraction pattern in longitudinal position space, as seen before in other models. Then we present a comparative study of the nucleon charge and anomalous magnetization densities in the transverse plane. Flavor decompositions of the form factors and transverse densities are also discussed.

Nucleon and flavor form factors in a light front quark model in AdS/QCD

Using the light front wave functions for the nucleons in a quark model in AdS/QCD, we calculate the nucleon electromagnetic form factors. The flavor decompositions of the nucleon form factors are calculated from the GPDs in this model. We show that the nucleon form factors and their flavor decompositions calculated in AdS/QCD are in agreement with experimental data.

Quark Wigner distributions and spin-spin correlations

We investigate the Wigner distributions for

Chiral-odd generalized parton distributions for proton in a light-front quark-diquark model

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Transverse charge and magnetization densities in holographic QCD

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Relating transverse structure of various parton distributions

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Wigner distributions and orbital angular momentum of a proton

quarks in a light-front quark-diquark model of a proton to unravel the spatial and spin structure. The light-front wave functions are modeled from the soft-wall AdS/QCD prediction. We consider the contributions from both the scalar and the axial vector diquarks. The Wigner distributions for unpolarized, longitudinally polarized, and transversely polarized protons are presented in the transverse momentum plane as well as in the transverse impact parameter plane. The Wigner distributions satisfy a Soffer-bound-type inequality. We also evaluate all the leading twist GTMDs and show their scale evolution. The spin-spin correlations between the quark and the proton are investigated

Charge and longitudinal momentum distributions in transverse coordinate space

We present a study of the chiral-odd generalized parton distributions (GPDs) for

A Comparative Study of Nucleon Structure in Light-Front Quark Models in AdS/QCD

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Gross-Neveu model with Borici-Creutz fermion

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