Gluon distributions in the proton in a light-front spectator model

Abstract

We formulate a light-front spectator model for the proton incorporating the gluonic degree of freedom. In this model, at high energy scattering of the proton, the active parton is a gluon and the rest is viewed as a spin-$\frac{1}{2}$ spectator with an effective mass. The light front wave functions of the proton are constructed using a soft wall AdS/QCD prediction and parameterized by fitting the unpolarized gluon distribution function to the NNPDF3.0nlo data set. We investigate the helicity distribution of gluon in this model. We find that our prediction for the gluon helicity asymmetry agrees well with existing experimental data and satisfies the perturbative QCD constraints at small and large longitudinal momentum regions. We also present the transverse momentum dependent distributions (TMDs) for gluon in this model. We further show that the model-independent Mulders-Rodrigues inequalities are obeyed by the TMDs computed in our model.

14 pages, 7 figures

References in corpus (15)

• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• A first unbiased global determination of polarized PDFs and their uncertainties
• Evidence for polarization of gluons in the proton
• Relations between generalized and transverse momentum dependent parton distributions
• Transverse-momentum distributions in a diquark spectator model
• Generalized parton correlation functions for a spin-1/2 hadron
• Generalized parton correlation functions for a spin-0 hadron
• Generalized parton distributions and transverse densities in a light-front quark-diquark model for the nucleons
• Glue spin and helicity in proton from lattice QCD
• A light front quark-diquark model for the nucleons
• How well do we know the gluon polarization in the proton?
• Towards the determination of the gluon helicity distribution in the nucleon from lattice quantum chromodynamics
• Gluon Sivers function in a light-cone spectator model
• Gluon distributions and their applications to Ioffe-time distributions
• New findings in gluon TMD physics

Cited by in corpus (12)

• Forces inside a strongly-coupled scalar nucleon
• Unwinding the rare $\Omega$ sector: Fragmentation of fully charmed baryons from HL-LHC to FCC
• Stress out of charmonia
• Gravitational form factor $D$ of charmonium from shear stress
• Spin-flip gluon GTMD $F_{1,2}$ at small-$x$
• Gluon Generalized TMDs and Wigner Distributions in boost invariant longitudinal space
• Triply Heavy $\Omega$ Baryons with JETHAD: A High-Energy Viewpoint
• Polarized and unpolarized gluon PDFs: generative machine learning applications for lattice QCD matrix elements at short distance and large momentum
• Production of $S$-wave charmonia in the soft gluon resummation approach using the NRQCD
• Gluon generalized transverse momentum dependent parton distributions and Wigner functions of the Proton
• Nucleon Structure from Basis Light-Front Quantization : Status and Prospects
• Color dipole cross-section from unifying the color dipole picture and improved saturation models