• Open Access

Measurement of the Soft-Drop Jet Mass in pp Collisions at s=13TeV with the ATLAS Detector

M. Aaboud et al. (The ATLAS Collaboration)
Phys. Rev. Lett. 121, 092001 – Published 28 August 2018

Abstract

Jet substructure observables have significantly extended the search program for physics beyond the standard model at the Large Hadron Collider. The state-of-the-art tools have been motivated by theoretical calculations, but there has never been a direct comparison between data and calculations of jet substructure observables that are accurate beyond leading-logarithm approximation. Such observables are significant not only for probing the collinear regime of QCD that is largely unexplored at a hadron collider, but also for improving the understanding of jet substructure properties that are used in many studies at the Large Hadron Collider. This Letter documents a measurement of the first jet substructure quantity at a hadron collider to be calculated at next-to-next-to-leading-logarithm accuracy. The normalized, differential cross section is measured as a function of log10ρ2, where ρ is the ratio of the soft-drop mass to the ungroomed jet transverse momentum. This quantity is measured in dijet events from 32.9fb1 of s=13TeV proton-proton collisions recorded by the ATLAS detector. The data are unfolded to correct for detector effects and compared to precise QCD calculations and leading-logarithm particle-level Monte Carlo simulations.

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  • Received 22 November 2017
  • Revised 21 March 2018
  • Corrected 29 June 2020

DOI:https://doi.org/10.1103/PhysRevLett.121.092001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

© 2018 CERN, for the ATLAS Collaboration

Physics Subject Headings (PhySH)

Particles & Fields

Corrections

29 June 2020

Correction: Figures 1–3 were plotted using an incorrect computation and have been set right. In addition, a small number of errors throughout the Letter in the description of the normalization regions have been fixed.

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Vol. 121, Iss. 9 — 31 August 2018

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