Experimental QCD summary (ICHEP 2020)

TL;DR

This paper summarizes recent experimental results in quantum chromodynamics from ICHEP 2020, covering measurements of the strong coupling, parton distributions, and jet substructure primarily from LHC proton-proton collisions.

Contribution

It provides a comprehensive overview of the latest experimental QCD studies, highlighting new measurements and comparisons with theoretical calculations from a major physics conference.

Findings

Precise measurements of the strong coupling constant $oldsymbol{ ext{α}_s(m_{ m Z})}$.

Comparison of data with fixed-order and resummed perturbative QCD calculations.

Insights into parton distribution functions and jet substructure analyses.

Abstract

This writeup summarizes the main experimental studies of the strong interaction, theoretically described by quantum chromodynamics (QCD), that were presented during the ICHEP-2020 conference. The latest results, measured mostly in p-p collisions at the LHC, are categorized in seven broad topics: (i) Extractions of the strong coupling constant $\alpha_s(m_{\rm Z})$; (ii) Comparison of data to fixed-order (N$^{\rm n}$LO) perturbative QCD calculations; (iii) Determinations of parton distribution functions (PDFs); (iv) Comparison of data to resummed (N$^{\rm n}$LL) pQCD calculations; (v) Parton showering and jet substructure analyses; (vi) Semihard (double parton interactions, multiparton interactions, hard diffraction), and soft (elastic and diffractive) QCD scatterings; and (vii) Studies of parton hadronization in $\rm e^+e^-$ and p-p collisions.