In this report, an updated result on both quark helicity and unpolarized colinear PDFs are calculated using CLQCD ensembles within the framework of LaMET. This calculation is dedicated to give one of the newest results with continous extrapolation performed on physical point. NNLO Wilsonian coefficients and matching kernels with leading-renormalon resummation and renormalization group...
This report presents a lattice QCD study of parton distribution functions using current-current correlators within LAME. Unlike conventional quasi-PDF approaches based on Wilson-line operators, current-current correlators have simpler renormalization properties and avoid linear power divergences and associated renormalon ambiguities. We formulate the large-momentum expansion for vector-vector...
Light-cone distribution amplitudes (LCDAs) of heavy hadrons play a central role in the QCD description of exclusive processes involving heavy quarks. They encode essential nonperturbative information and provide key inputs for phenomenological analyses based on factorization. In this talk, I will present recent progress on the structure and determination of heavy-hadron LCDAs, with emphasis on...
We present the first lattice QCD calculation of all components of the leading-twist light-cone distribution amplitudes (LCDAs) of baryons at the physical pion mass and in the continuum limit, within the Large-Momentum Effective Theory (LaMET) framework.
This work provides a systematic first-principles determination of baryon LCDAs beyond moment-based approaches, enabling direct access to...
We determine the leading-twist light-cone distribution amplitude (LCDA) moments of mesons using the HYP-smeared clover action on MILC ensembles, employing both twist-2 local operators and the LaMET approach. From the twist-2 local operators, we obtain high-precision values for the meson LCDA moments at the physical point and in the continuum limit. A comparison between the two methods shows...
The transverse-momentum-dependent parton distribution function (TMDPDF) encodes essential information on the three-dimensional momentum structure of hadrons and plays a central role in QCD factorization for semi-inclusive processes. A first-principles determination of TMDPDFs remains highly challenging because of their intrinsically nonperturbative nature and the presence of both ultraviolet...
TMD quantities, such as TMDPDFs, provide essential information on the three-dimensional structure of hadrons and serve as key nonperturbative inputs for high-energy scattering processes, including SIDIS and Drell–Yan production. Unlike collinear PDFs, TMDs involve near-light-cone Wilson lines and therefore suffer from rapidity divergences arising from the separation of soft and collinear...
We present the results of the first lattice calculation of the Collins-Soper (CS) kernel from a vacuum soft function, which is constructed from space-like Wilson lines with complex direction vectors. Employing three ensembles of pure SU(3) gauge configurations at fine lattice spacings, we achieve high statistical precision in computing the soft function, whose rapidity dependence is well...
At large hadron momentum, quasi-transverse-momentum-dependent distributions (quasi-TMDs) defined from Coulomb-gauge correlators can be expanded and perturbatively matched to the light-cone TMDs up to the subtraction of an intrinsic soft function. In this talk, I will discuss the derivation of the operator definition of this soft function, as well as the method to extract it from a meson form...
The light-cone distribution amplitude (LCDA) is a non-perturbative quantity for understanding hadron structure and exclusive scattering processes. We present on our calculation of moments of the pion and kaon LCDAs using the heavy-quark operator product expansion (HOPE) framework. This method employs an OPE analysis of hadronic amplitudes through the inclusion of a fictitious valence heavy...
Calculating parton functions from first principles remains a major challenge: they require matrix elements with a Wilson line along a light-like direction, which are not directly accessible in the Euclidean lattice formulation underlying conventional Monte Carlo simulations. In contrast, the Hamiltonian formalism allows for a direct treatment of light-cone dynamics, complementing indirect...
I will describe our attempts to compute the meson lightcone distribution amplitude and a meson GPD on a quantum computer.
