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

Research output: Contribution to journalArticlepeer-review

  • External authors:
  • Rafal Bielski
  • Agni Bethani
  • Ian Connelly
  • Brian Cox
  • Cinzia Da Via
  • Nicholas Dann
  • Alessandra Forti
  • James Howarth
  • David Lack
  • Stephen Marsden
  • Jiri Masik
  • Joleen Pater
  • Yang Qin
  • John Raine
  • Jacob Rawling
  • Rhys Roberts
  • Savanna Shaw
  • Lee Tomlinson
  • Stephen Watts
  • Fabian Wilk
  • Terence Wyatt

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
log
10
ρ
2
, where
ρ
is the ratio of the soft-drop mass to the ungroomed jet transverse momentum. This quantity is measured in dijet events from
32.9


fb

1
of

s
=
13


TeV
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.

Bibliographical metadata

Original languageEnglish
Article number092001
JournalPhysical Review Letters
Volume121
Issue number9
DOIs
Publication statusPublished - 28 Aug 2018