From C to Parton Sea: Bjorken-x Dependence of the PDFs

Abstract

Studying the structure of nucleons is not only important to understanding the strong interactions of quarks and gluons, but also to improving the precision of new-physics searches. Since a broad class of experiments, including the LHC and dark-matter detection, require Standard-Model backgrounds with parton distribution functions (PDFs) as inputs for disentangling SM contributions from potential new physics. For a long time, lattice calculations of the PDFs (as well as many hadron structures) has been limited to the first few moments. In this talk, we present a first direct calculation of the Bjorken-x dependence of the PDFs using Large-Momentum Effective Theory (LaMET). An exploratory study of the antiquark/sea flavor asymmetry of these distributions will be discussed. This breakthrough opens an exciting new frontier calculating more complicated quantities, such as gluon structure and transverse-momentum dependence, which will complement existing theoretical programs for the upcoming Electron-Ion Collider (EIC) or Large Hadron-Electron Collider (LHeC).

Plenary talk at the 34th annual International Symposium on Lattice Field Theory, 24-30 July 2016

References in corpus (11)

• Parton distributions for the LHC
• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• A first unbiased global determination of polarized PDFs and their uncertainties
• A Lattice Calculation of Parton Distributions
• Improved quasi parton distribution through Wilson line renormalization
• New limits on intrinsic charm in the nucleon from global analysis of parton distributions
• Measurement of longitudinal spin asymmetries for weak boson production in polarized proton-proton collisions at RHIC
• First Calculation of Hyperon Axial Couplings from Lattice QCD
• Nucleon tensor charge from Collins azimuthal asymmetry measurements
• Practical quasi parton distribution functions
• A Review of Nucleon Spin Calculations in Lattice QCD