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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 √s=13 TeV with the ATLAS detector

Aaboud, M ; Åkesson, Torsten LU orcid ; Bocchetta, Simona LU ; Bryngemark, Lene LU ; Doglioni, Caterina LU ; Hedberg, Vincent LU ; Jarlskog, Göran LU ; Lytken, Else LU orcid ; Mjörnmark, Ulf LU and Smirnova, Oxana LU orcid , et al. (2017) In European Physical Journal C 77(4).
Abstract
Measurements of jet activity in top-quark pair events produced in proton–proton collisions are presented, using 3.2 fb- 1of 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 eμ 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, pT. 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 pTthreshold for additional jets, and is also presented for different invariant mass regions of... (More)
Measurements of jet activity in top-quark pair events produced in proton–proton collisions are presented, using 3.2 fb- 1of 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 eμ 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, pT. 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 pTthreshold for additional jets, and is also presented for different invariant mass regions of the eμbb¯ 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. © 2017, CERN for the benefit of the ATLAS collaboration. (Less)
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Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
77
issue
4
publisher
Springer
external identifiers
  • scopus:85017197839
  • pmid:28515663
ISSN
1434-6044
DOI
10.1140/epjc/s10052-017-4766-0
language
English
LU publication?
yes
id
c39c21ff-793b-4169-810b-c71f22ef46d6
date added to LUP
2018-09-27 11:32:20
date last changed
2022-04-17 22:35:20
@article{c39c21ff-793b-4169-810b-c71f22ef46d6,
  abstract     = {{Measurements of jet activity in top-quark pair events produced in proton–proton collisions are presented, using 3.2 fb- 1of 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 eμ 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, pT. 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 pTthreshold for additional jets, and is also presented for different invariant mass regions of the eμbb¯ 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. © 2017, CERN for the benefit of the ATLAS collaboration.}},
  author       = {{Aaboud, M and Åkesson, Torsten and Bocchetta, Simona and Bryngemark, Lene and Doglioni, Caterina and Hedberg, Vincent and Jarlskog, Göran and Lytken, Else and Mjörnmark, Ulf and Smirnova, Oxana and Viazlo, Oleksandr}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C}},
  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 √s=13 TeV with the ATLAS detector}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-017-4766-0}},
  doi          = {{10.1140/epjc/s10052-017-4766-0}},
  volume       = {{77}},
  year         = {{2017}},
}