Скачать или смотреть Parton distributions from boosted fields in the Coulomb gauge

LBL HIT Seminar Tuesday, March 19th, 3:30PM (in-person and on zoom)

Dr. Xiang Gao (Physics Division, Argonne National Laboratory)

"Parton distributions from boosted fields in the Coulomb gauge"

Over the past few years, significant progress has been made in computing parton distributions from lattice QCD within the framework of large momentum effective theory (LaMET). The light-cone parton distributions were derived from gauge-invariant equal-time corrrelators with large momentum boost. In this talk, we introduce a new approach to calculate parton distributions from correlations of boosted quarks and gluons in the Coulomb gauge (CG), without Wilson lines. This new method can substantially improve statistical precision and simplify renormalization, thus providing a more efficient way to calculate parton distributions in lattice QCD, particularly for 3D distributions. We verified the validity of this method at next-to-leading order in perturbation theory and used it to calculate the pion valence quark PDF. Additionally, we derived the Collins-Soper kernel from a CG quasi-TMD up to $b_T$=4.2 GeV^{-1}, further demonstrating its effectiveness and potential for future lattice calculations.