Transverse-Momentum-Dependent Proton Structures from Lattice QCD *

Jul 19, 2022, 9:40 AM
Classroom 512 (APCTP)

Classroom 512


Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 37673, Korea


Yong Zhao (Argonne National Laboratory)


The transverse-momentum-dependent parton distributions (TMDs) are key quantities that describe the 3D proton structure seen in high-energy scatterings. The TMDs can be extracted from hard processes where a TMD factorization formula applies, while the key challenges faced by global analyses include the non-perturbative effects when the parton transverse momentum is at the QCD scale $\Lambda_{\rm QCD}$. This situation can be substantially improved with the first-principles calculation of such non-perturbative information from lattice QCD. In recent years, motivated by large-momentum effective theory (LaMET), there have been rapid progress in the theoretical method and numerical study of TMDs from the lattice QCD. Now it is known that the quark and gluon TMDs of arbitrary flavor and spin dependence can be obtained from the factorization of quasi-TMDs within the LaMET framework, and first lattice results have shown encouraging signs of making phenomenological impacts. In this talk, I will review all the progress in this direction.

Primary author

Yong Zhao (Argonne National Laboratory)

Presentation materials