Name: ATLAS_2017_I1495243
Year: 2016
Summary: ttbar + jets at 13 TeV
Experiment: ATLAS
Collider: LHC
InspireID: 1495243
Status: VALIDATED
Reentrant: true
Authors:
 - Callie Bertsche <c.bertsche@cern.ch>
 - Judith Katzy <judith.katzy@desy.de>
 - Krishna Kulkarni <krishna.kulkarni@desy.de>
 - Christian Gutschow <chris.g@cern.ch>
References:
 - Eur.Phys.J. C77 (2017) no.4, 220
 - doi:10.1140/epjc/s10052-017-4766-0
 - arXiv:1610.09978 [hep-ex]
Keywords:
 - ttbar
 - rapgap
RunInfo:
  p + p -> ttbar (dileptonic, needs high statistics [~2 million] to populate gap fractions).
Luminosity_fb: 3.2
Beams: [p+, p+]
Energies: [13000]
PtCuts: [25]
NeedCrossSection: True
Description:
  'Measurements of jet activity in top-quark pair events produced in proton--proton collisions are presented, using 3.2 fb$^{-1}$
  of $pp$ collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider.
  Events are chosen by requiring an opposite-charge $e\mu$ pair and two $b$-tagged jets in the final state. The normalised differential
  cross-sections of top-quark pair production are presented as functions of additional-jet multiplicity and transverse momentum,
  $p_\text{T}$. The fraction of signal events that do not contain additional jet activity in a given rapidity region, the gap fraction,
  is measured as a function of the $p_\text{T}$ threshold for additional jets, and is also presented for different invariant mass regions
  of the $e\mu b\bar{b}$ system. All measurements are corrected for detector effects and presented as particle-level distributions
  compared to predictions with different theoretical approaches for QCD radiation. While the kinematics of the jets from top-quark
  decays are  described well, the generators show differing levels of agreement with the measurements of observables that depend
  on the production of additional jets.'
BibKey: Aaboud:2016xii
BibTeX: '@article{Aaboud:2016xii,
      author         = "Aaboud, Morad and others",
      title          = "{Measurement of jet activity produced in top-quark events
                        with an electron, a muon and two $b$-tagged jets in the
                        final state in $pp$ collisions at $\sqrt{s}=13$ TeV with
                        the ATLAS detector}",
      collaboration  = "ATLAS",
      journal        = "Eur. Phys. J.",
      volume         = "C77",
      year           = "2017",
      number         = "4",
      pages          = "220",
      doi            = "10.1140/epjc/s10052-017-4766-0",
      eprint         = "1610.09978",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ex",
      reportNumber   = "CERN-EP-2016-218",
      SLACcitation   = "%%CITATION = ARXIV:1610.09978;%%"
}'
