@article{OPUS4-22655,
  title     = {Search for High-Mass Resonances Decaying to τν in \(pp\) Collisions at root \(s\)=13 TeV with the ATLAS Detector},
  series = {Physical Review Letters},
  volume    = {120},
  journal   = {Physical Review Letters},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1103/PhysRevLett.120.161802},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226556},
  pages     = {1-20},
  year      = {2018},
  abstract  = {A search for high-mass resonances decaying to tau nu using proton-proton collisions at root s = 13 TeV produced by the Large Hadron Collider is presented. Only tau-lepton decays with hadrons in the final state are considered. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 36.1 fb(-1). No statistically significant excess above the standard model expectation is observed; model-independent upper limits are set on the visible tau nu production cross section. Heavy W' bosons with masses less than 3.7 TeV in the sequential standard model and masses less than 2.2-3.8 TeV depending on the coupling in the nonuniversal Go(221) model are excluded at the 95\% credibility level.},
  language  = {en}
}
@article{OPUS4-22653,
  title     = {Search for a Structure in the B-s(0) π\(^{±}\) Invariant Mass Spectrum with the ATLAS Experiment},
  series = {Physical Review Letters},
  volume    = {120},
  journal   = {Physical Review Letters},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1103/PhysRevLett.120.202007},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226539},
  pages     = {1-19},
  year      = {2018},
  abstract  = {A search for the narrow structure, X(5568), reported by the DO Collaboration in the decay sequence X -> B-s(0) pi +/-, B-s(0) -> J/psi phi, is presented. The analysis is based on a data sample recorded with the ATLAS detector at the LHC corresponding to 4.9 fb(-1) of pp collisions at 7 TeV and 19.5 fb(-1)at 8 TeV. No significant signal was found. Upper limits on the number of signal events, with properties corresponding to those reported by DO, and on the A production rate relative to B-s(0) mesons, rho x, were determined at 95\% confidence level. The results are N(X) < 382 and rho x <0.015 for B-s(0) mesons with transverse momenta above 10 GeV and N(X) < 356 and rho(x) < 0.016 for transverse momenta above 15 GeV. Limits are also set for potential B-s(0) pi(+) resonances in the mass range 5550 to 5700 MeV.},
  language  = {en}
}
@article{OPUS4-22603,
  title     = {Measurement of colour flow using jet-pull observables in t(t)over-bar events with the ATLAS experiment at root \(s\)=13TeV},
  series = {European Physical Journal C},
  volume    = {78},
  journal   = {European Physical Journal C},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1140/epjc/s10052-018-6290-2},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226039},
  pages     = {1-31},
  year      = {2018},
  abstract  = {Previous studies have shown that weighted angular moments derived from jet constituents encode the colour connections between partons that seed the jets. This paper presents measurements of two such distributions, the jet-pull angle and jet-pull magnitude, both of which are derived from the jet-pull angular moment. The measurement is performed in delivered by the Large Hadron Collider. The observables are measured for two dijet systems, corresponding to the colour-connected daughters of the Wboson and the two b-jets from the top-quark decays, which are not expected to be colour connected. To allow the comparison of the measured distributions to colour model predictions, the measured distributions are unfolded to particle level, after correcting for experimental effects introduced by the detector. While good agreement can be found for some combinations of predictions and observables, none of the predictions describes the data well across all observables.},
  language  = {en}
}
@article{OPUS4-22672,
  title     = {Search for Low-Mass Dijet Resonances Using Trigger-Level Jets with the ATLAS Detector in \(pp\) Collisions at root \(s\)=13 TeV},
  series = {Physical Review Letters},
  volume    = {121},
  journal   = {Physical Review Letters},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1103/PhysRevLett.121.081801},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226725},
  pages     = {1-20},
  year      = {2018},
  abstract  = {Searches for dijet resonances with sub-TeV masses using the ATLAS detector at the Large Hadron Collider can be statistically limited by the bandwidth available to inclusive single-jet triggers, whose data-collection rates at low transverse momentum are much lower than the rate from standard model multijet production. This Letter describes a new search for dijet resonances where this limitation is overcome by recording only the event information calculated by the jet trigger algorithms, thereby allowing much higher event rates with reduced storage needs. The search targets low-mass dijet resonances in the range 450-1800 GeV. The analyzed data set has an integrated luminosity of up to 29.3 fb(-1) and was recorded at a center-of-mass energy of 13 TeV. No excesses are found; limits are set on Gaussian-shaped contributions to the dijet mass distribution from new particles and on a model of dark-matter particles with axial-vector couplings to quarks.},
  language  = {en}
}
@article{OPUS4-31736,
  title     = {Search for heavy particles decaying into a top-quark pair in the fully hadronic final state in \({pp}\) collisions at root s=13 TeV with the ATLAS detector},
  series = {Physical Review D},
  volume    = {99},
  journal   = {Physical Review D},
  number    = {9},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1103/PhysRevD.99.092004},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-317362},
  pages     = {1-38},
  year      = {2019},
  abstract  = {A search for new particles decaying into a pair of top quarks is performed using proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at a center-of-mass energy of root s = 13 TeV corresponding to an integrated luminosity of 36.1 fb(-1). Events consistent with top-quark pair production and the fully hadronic decay mode of the top quarks are selected by requiring multiple high transverse momentum jets including those containing b-hadrons. Two analysis techniques, exploiting dedicated top-quark pair reconstruction in different kinematic regimes, are used to optimize the search sensitivity to new hypothetical particles over a wide mass range. The invariant mass distribution of the two reconstructed top-quark candidates is examined for resonant production of new particles with various spins and decay widths. No significant deviation from the Standard Model prediction is observed and limits are set on the production cross-section times branching fraction for new hypothetical Z' bosons, dark-matter mediators, Kaluza-Klein gravitons and Kaluza-Klein gluons. By comparing with the predicted production cross sections, the Z' boson in the topcolor-assisted-technicolor model is excluded for masses up to 3.1-3.6 TeV, the dark-matter mediators in a simplified framework are excluded in the mass ranges from 0.8 to 0.9 TeV and from 2.0 to 2.2 TeV, and the Kaluza-Klein gluon is excluded for masses up to 3.4 TeV, depending on the decay widths of the particles.},
  language  = {en}
}
@article{OPUS4-22687,
  title     = {Search for electroweak diboson production in association with a high-mass dijet system in semileptonic final states in \(pp\) collisions at √\(s\) =13 TeV with the ATLAS detector},
  series = {Physical Review D},
  volume    = {100},
  journal   = {Physical Review D},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1103/PhysRevD.100.032007},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226877},
  pages     = {36},
  year      = {2019},
  abstract  = {This paper reports on a search for electroweak diboson (WW/WZ/ZZ) production in association with a high-mass dijet system, using data from proton-proton collisions at a center-of-mass energy of N root s = 13 TeV. The data, corresponding to an integrated luminosity of 35.5 fb(-1), were recorded with the ATLAS detector in 2015 and 2016 at the Large Hadron Collider. The search is performed in final states in which one boson decays leptonically, and the other boson decays hadronically. The hadronically decaying W/Z boson is reconstructed as either two small-radius jets or one large-radius jet using jet substructure techniques. The electroweak production of WW/WZ/ZZ in association with two jets is measured with an observed (expected) significance of 2.7 (2.5) standard deviations, and the fiducial cross section is measured to be 45.1 +/- 8.6(stat.)(-14.6)(+15.9)(syst.) fb.},
  language  = {en}
}