Measurements of multijet event isotropies using optimal transport with the ATLAS detector
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Date
2023
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Abstract
A measurement of novel event shapes quantifying the isotropy of collider events is performed in 140 fb−1 of proton-proton collisions with √ s = 13 TeV centre-of-mass energy recorded with the ATLAS detector at CERN’s Large Hadron Collider. These event shapes are defned 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 defned 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 efects, 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 fnal states up to the TeV-scale.
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Keywords
Hadron-Hadron Scattering, Jet Physics, Jets