# Measurement of hadronic event shapes in multijet final states at $\sqrt{s}=13$ TeV with the ATLAS detector

ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review

## Abstract

A measurement of event-shape variables in proton$-$proton collisions at large momentum transfer is presented using data collected at $\sqrt{s} = 13$ TeV with the ATLAS detector at the Large Hadron Collider. Six event-shape variables calculated using hadronic jets are studied in inclusive multijet events using data corresponding to an integrated luminosity of 139 fb$^{-1}$. Measurements are performed in bins of jet multiplicity and in different ranges of the scalar sum of the transverse momenta of the two leading jets, reaching scales beyond 2 TeV. These measurements are compared with predictions from Monte Carlo event generators containing leading-order or next-to-leading order matrix elements matched to parton showers simulated to leading-logarithm accuracy. At low jet multiplicities, shape discrepancies between the measurements and the Monte Carlo predictions are observed. At high jet multiplicities, the shapes are better described but discrepancies in the normalisation are observed.
Original language English JHEP 2021:88 https://doi.org/10.1007/JHEP01(2021)188 Accepted/In press - 14 Dec 2020

### Bibliographical note

28 pages plus author list (45 pages total), 9 figures, 1 table, submitted to JHEP, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2019-02/

• hep-ex

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