arXiv subjects

Sujit Jana

Publications and source records attributed to Sujit Jana.

5 recordsLinked to original sources

arXiv2026

Electron-Ion Collision Environment: Distribution of Quark Spin and Orbital Angular Momentum

The future Electron-Ion Collider (EIC) will enable measurements of the same partonic distributions inside both the proton and the nucleus through electron-proton (eP) and electron-ion (eA) collisions. This capability motivates the present theoretical study of the distributions of quark spin and orbital angular momentum within the proton and the nucleus. To map the eP and eA collision environments, we employ the Nambu--Jona-Lasinio (NJL) model at finite nuclear density to determine the constituent quark masses at zero nuclear density and near the nuclear saturation density. Using these quark mass inputs, we calculate the generalized transverse momentum-dependent parton distributions (GTMDs) associated with quark orbital angular momentum (OAM), spin, and spin-orbit correlations within the light-front dressed quark model. Furthermore, inspired by the nuclear suppression factor widely used in heavy-ion collision experiments, we introduce a set of GTMD ratios between eP and eA collisions. Any deviation of these ratios from unity provides an indirect measure of many-body nuclear density effects arising from non-perturbative quantum chromodynamics (QCD).

hep-ph↗

arXiv2025

Unveiling Skewness Dependence of Quark Wigner Distributions

We present a detailed investigation of the skewness dependence of quark Wigner distributions within the light-front dressed quark model. While previous studies have largely focused on the forward limit, we explore the impact of nonzero longitudinal momentum transfer ($\xi \neq 0$) on the full set of leading-twist quark Wigner distributions across various polarization configurations. We observe characteristic distortions in the spatial and momentum correlations with increasing skewness, including the emergence of dipole and quadrupole patterns, asymmetries, and localization effects. These features reflect spin-orbit correlations and quantum interference between light-front wave function components with differing orbital angular momentum.

hep-ph↗

arXiv2025

Gluon Wigner distributions with transverse polarization at non-zero skewness

We investigate the gluon Wigner distributions at non-zero skewness using light-front wave functions (LFWFs) in the dressed quark model, where the target state is a quark dressed with a gluon in the leading-order Fock space expansion. Our analysis focuses on the configurations in which the gluon, the target, or both are transversely polarized. We derive analytical expressions for the Wigner distributions in the boost-invariant longitudinal space ($\sigma$) for transversely polarized configurations and observe a diffraction-like oscillatory pattern in $\sigma$-space, analogous to that reported earlier for unpolarized and longitudinally polarized gluons.

hep-ph↗

arXiv2024

Gluon Generalized TMDs and Wigner Distributions in boost invariant longitudinal space

We present the gluon generalized TMDs for non-zero skewness and Wigner distributions in the boost invariant longitudinal space. The boost-invariant longitudinal space is defined as $σ=\frac{1}{2}b^-Δ^+$ and is conjugate to the skewness variable $ξ$. We use the dressed quark model, where a high-energetic quark is dressed by a gluon. This two-particle system has the advantage of addressing both the gluon and the quark sectors. The different contributions in Wigner distributions coming from different polarization of gluon and the dressed quark system are investigated. The Wigner distributions are obtained by taking the Fourier transformation of generalized TMDs, which we derive for the first time for non-zero skewness in dressed quark model.

hep-ph↗

arXiv2022

Quark generalized TMDs at skewness and Wigner Distribution in boost invariant longitudinal space

The boost-invariant longitudinal space, defined by the parameter $σ=\frac{1}{2}b^-P^+$ can be studied from the Fourier transformation of distributions over the conjugate variable skewness $ξ$. We investigate quark Wigner distributions in the $σ$ space in dressed quark model and found diffraction patterns that are analogous to the single slit experiment of light in optics. The width of the central maxima varies with energy transfer to the system and essentially $ξ$ behaves like a slit-width. Qualitatively similar diffraction pattern is reported recently in other models. In this model, we compute all the leading twist GTMDs with non-zero skewness for quarks which provides Wigner distributions under Fourier transformation.

hep-ph↗