We discuss our present knowledge of α s, the fundamental running coupling or effective
charge of Quantum Chromodynamics (QCD). A precise understanding of the running of α s …

High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large
number of particles along the beam collision axis, outside of the acceptance of existing LHC …

An overwhelming number of theoretical predictions for hadron colliders require parton
distribution functions (PDFs), which are an important ingredient of theory infrastructure for …

Abstract This White Paper presents an overview of the current status and future perspective
of QCD research, based on the community inputs and scientific conclusions from the 2022 …

A bstract We calculate the massless unpolarized Wilson coefficients for deeply inelastic
scattering for the structure functions F 2 (x, Q 2), FL (x, Q 2), xF 3 (x, Q 2) in the\(\overline …

This report, as part of the 2021 Snowmass Process, summarizes the current status of collider
physics at the Energy Frontier, the broad and exciting future prospects identified for the …

We calculate the quarkonic O (α s 2) massive operator matrix elements Δ AQ g (N), Δ AQ q
PS (N) and Δ A qq, Q NS (N) for the twist–2 operators and the associated heavy flavor …

The non-first-order-factorizable contributions 1 to the unpolarized and polarized massive
operator matrix elements to three-loop order, AQ g (3) and Δ AQ g (3), are calculated in the …

A bstract In a previous article, we have shown that the discrepancy between the fixed-order
(FOPT) and contour-improved (CIPT) perturbative expansions for τ hadronic spectral …

This report was prepared on behalf of three Energy Frontier Topical Groups of the
Snowmass 2021 Community Planning Exercise. It summarizes the status and implications of …