Scientific article
Open access

Measurements of multijet event isotropies using optimal transport with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, 60
Publication date2023
First online date2023-10-10

A measurement of novel event shapes quantifying the isotropy of collider events is performed in 140 fb$^{−1}$ of proton-proton collisions with $ \sqrt{s} $ = 13 TeV centre-of-mass energy recorded with the ATLAS detector at CERN’s Large Hadron Collider. These event shapes are defined as the Wasserstein distance between collider events and isotropic reference geometries. This distance is evaluated by solving optimal transport problems, using the ‘Energy-Mover’s Distance’. Isotropic references with cylindrical and circular symmetries are studied, to probe the symmetries of interest at hadron colliders. The novel event-shape observables defined in this way are infrared- and collinear-safe, have improved dynamic range and have greater sensitivity to isotropic radiation patterns than other event shapes. The measured event-shape variables are corrected for detector effects, and presented in inclusive bins of jet multiplicity and the scalar sum of the two leading jets’ transverse momenta. The measured distributions are provided as inputs to future Monte Carlo tuning campaigns and other studies probing fundamental properties of QCD and the production of hadronic final states up to the TeV-scale.

  • Hadron-Hadron Scattering
  • Jet Physics
  • Jets
  • P p: colliding beams
  • Jet: multiplicity
  • Final state: ((n)jet)
  • Scale: TeV
  • Final state: hadronic
  • Jet: multiple production
  • P p: scattering
  • Event shape analysis
  • Quantum chromodynamics
  • Geometry
  • CERN Lab
  • Sensitivity
  • Multiplicity: dependence
  • Transverse momentum dependence
  • CERN LHC Coll
  • Numerical calculations: Monte Carlo
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Measurements of multijet event isotropies using optimal transport with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, p. 60. doi: 10.1007/jhep10(2023)060
Main files (1)
Article (Published version)
ISSN of the journal1029-8479

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