The proton's unpolarized $u(x)-d(x)$ parton distribution function (PDF) has been studied by a number of lattice QCD groups through large momentum expansion. However, due to lattice artifacts (excited state contaminations, unphysical pion masses, and discretization effects) and less-advanced theoretical analysis (renormalizations, large-distance extrapolations, and large-log resummations), the...
In recent years, the $x$-dependence of parton distribution functions (PDFs) has become accessible through non-local operators of a boosted hadron by utilizing techniques such as large momentum effective theory (LaMET) and short distance factorization (SDF). Embedded in these distribution functions are Mellin moments, which contain information on fundamental properties of hadrons, such as the...
I will consider in the effective field theory framework how UV quantum fluctuations destroy the concept of light travel and partons, unless in an asymptotic free theory.
With the future Electron Ion Collider on the horizon, Generalized Parton Distributions (GPDs) have attracted significant interest over the past years. As a tool to map out the three-dimensional structure of hadrons, they offer unique opportunities to study Quantum Chromodynamics (QCD) and complex partonic correlators at non-perturbative scales. However, their experimental extraction is...
We present a lattice quantum chromodynamics (QCD) calculation of the proton valence-quark transverse-momentum-dependent parton distribution function (TMDPDF) in three polarization channels within the framework of large-momentum effective theory (LaMET). Using correlators fixed in the Coulomb gauge (CG), we computed the quasi-TMD beam function for a proton with the chiral-symmetry-preserving...
The recent proposal to use nonlocal, Coulomb gauge-fixed operators in a LaMET framework to measure hadron structure properties has seen great success, as it circumvents poor signal-to-noise issues present with Wilson line operators. In this contribution, I will discuss nonperturbative renormalization schemes for Coulomb gauge-fixed operators, including RI'-MOM schemes adapted to only use...
