arXiv subjects

Parashmani Thakuria

Publications and source records attributed to Parashmani Thakuria.

3 recordsLinked to original sources

arXiv2026

Light sea-quark flavor asymmetry and angular momentum of the nucleon in a scalar-vector spectator model

We present a light-front spectator model that describes the proton as an active sea antiquark paired with a composite scalar-vector spectator. Using a spatial profile based on soft-wall AdS/QCD, we fit our initial parameters to CT18NNLO data and Bacchetta-Radici extractions at an initial scale of $μ_0^2=1.0~\text{GeV}^2$. By allowing these parameters to evolve dynamically, we extend our distributions up to $μ^2=100~\text{GeV}^2$. We specifically calculate the sea-quark asymmetry at the SeaQuest scale, predicting a sustained $\bar{d}$ enhancement at high $x$ that is in excellent agreement with recent E906 measurements. Additionally, we calculate the leading chiral-even generalized parton distributions (GPDs) and evaluate the total angular momentum carried by the sea quarks, comparing our findings with established results.

hep-ph↗

arXiv2025

Exploring twist-3 chiral even generalized parton distributions of light sea quarks in the proton using the light front model

We develop a light-front model of the proton to investigate the twist-3 chiral-even generalized parton distributions (GPDs) of light sea quarks. In this framework, sea quarks are treated as spin-$\frac{1}{2}$ active partons, while the remaining proton constituents are modeled as spin-1 spectators. The light-front momentum wave function, derived from the soft-wall AdS/QCD approach, is fitted to unpolarized parton distribution functions (PDFs) from the CETQ global analysis to constrain the model parameters. To further validate the model, we analyze the sea quark flavor asymmetry through the difference $\bar{d}(x) - \bar{u}(x)$ and the ratio $\bar{d}(x)/\bar{u}(x)$, achieving good agreement with known phenomenological trends. Using this fitted distribution, we compute the twist-3 chiral-even GPDs and examine their dependence on the transverse momentum transfer $\boldsymbol{Δ_T}$ and the longitudinal momentum fraction $x$. In addition, we evaluate the twist-3 chiral-even PDF $g_T(x)$ within this framework. The contribution of sea quarks to the proton's orbital angular momentum is also investigated and compared with existing results in the literature.

hep-ph↗

arXiv2025

Subleading Twist-3 Gluon Generalized Parton Distributions in the Light-Front Model

We present a calculation of the twist-3 generalized parton distributions (GPDs) for gluons in the proton. Our analysis is performed within a light-front constituent model where the proton is treated as a two-body state of a spin-1 gluon and a spin-1/2 spectator system. The requisite light-front wave functions are derived from the soft-wall AdS/QCD correspondence. We compute the complete set of twist-3 gluon GPDs over a broad kinematic range. The corresponding distributions in impact parameter space are obtained via Fourier transform, revealing the transverse spatial distribution of gluons. Furthermore, we evaluate the contribution of these GPDs to the gluon kinetic orbital angular momentum (OAM) and compare our findings with other theoretical predictions.

hep-ph↗