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78 papers found.
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Measurements of properties of strong and electroweak forces with the ATLAS detector at the LHC

bosons, mediators of the strong and electroweak forces. The production of single and multiple electroweak vector bosons in proton-proton collisions in LHC Run-1 has been extensively studied by the ATLAS ... Collaboration [1] leading to a number of precision measurements. The production of charged and neutral weak gauge bosons via the Drell Yan process is sensitive to higher-order effects in the strong force, the

Search for doubly charged Higgs bosons in like-sign dilepton final states at \(\sqrt{s} = 7\ \mathrm{TeV}\) with the ATLAS detector

The ATLAS Collaboration 0 0 CERN, 1211 Geneva 23, Switzerland A search for doubly charged Higgs bosons decaying to pairs of electrons and/or muons is presented. The search is performed using a data

Identification and rejection of fake reconstructed jets from a fluctuating heavy ion background in ATLAS

Full jet reconstruction in relativistic heavy ion collisions provides new and unique insights to the physics of parton energy loss. Because of the large underlying event multiplicity in A+A collisions, random and correlated fluctuations in the background can result in the reconstruction of fake jets. These fake jets must be identified and rejected to obtain the purest jet sample...

Measurement of the ratio of cross sections for inclusive isolated-photon production in pp collisions at \( \sqrt{s} \) = 13 and 8 TeV with the ATLAS detector

Abstract The ratio of the cross sections for inclusive isolated-photon production in pp collisions at centre-of-mass energies of 13 and 8 TeV is measured using the ATLAS detector at the LHC. The integrated luminosities of the 13 TeV and 8 TeV datasets are 3.2 fb−1 and 20.2 fb−1, respectively. The ratio is measured as a function of the photon transverse energy in different regions...

Search for Higgs boson pair production in the \( b\overline{b}W{W}^{*} \) decay mode at \( \sqrt{s} \) = 13 TeV with the ATLAS detector

Abstract A search for Higgs boson pair production in the \( b\overline{b}W{W}^{*} \) decay mode is performed in the \( b\overline{b}\mathit{\ell \nu qq} \) final state using 36.1 fb−1 of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. No evidence of events beyond the background expectation is found...

Measurement of the four-lepton invariant mass spectrum in 13 TeV proton-proton collisions with the ATLAS detector

Abstract A measurement of the four-lepton invariant mass spectrum is made with the ATLAS detector, using an integrated luminosity of 36.1 fb−1 of proton-proton collisions at \( \sqrt{s} \) = 13 TeV delivered by the Large Hadron Collider. The differential cross-section is measured for events containing two same-flavour opposite-sign lepton pairs. It exhibits a rich structure, with...

Measurements of inclusive and differential fiducial cross-sections of \( t\overline{t} \) production with additional heavy-flavour jets in proton-proton collisions at \( \sqrt{s} \) = 13 TeV with the ATLAS detector

Abstract This paper presents measurements of \( t\overline{t} \) production in association with additional b-jets in pp collisions at the LHC at a centre-of-mass energy of 13 TeV. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 36.1 fb−1. Fiducial cross-section measurements are performed in the dilepton and lepton-plus-jets \( t...

Search for pair production of Higgs bosons in the \( b\overline{b}b\overline{b} \) final state using proton-proton collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector

Abstract A search for Higgs boson pair production in the \( b\overline{b}b\overline{b} \) final state is carried out with up to 36.1 fb−1 of LHC proton-proton collision data collected at \( \sqrt{s}=13 \) TeV with the ATLAS detector in 2015 and 2016. Three benchmark signals are studied: a spin-2 graviton decaying into a Higgs boson pair, a scalar resonance decaying into a Higgs...

Search for heavy Majorana or Dirac neutrinos and right-handed W gauge bosons in final states with two charged leptons and two jets at \( \sqrt{s}=13 \) TeV with the ATLAS detector

Abstract A search for heavy right-handed Majorana or Dirac neutrinos NR and heavy right-handed gauge bosons WR is performed in events with a pair of energetic electrons or muons, with the same or opposite electric charge, and two energetic jets. The events are selected from pp collision data with an integrated luminosity of 36.1 fb−1 collected by the ATLAS detector at \( \sqrt{s...

Search for new phenomena in events with same-charge leptons and b-jets in pp collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector

Abstract A search for new phenomena in events with two same-charge leptons or three leptons and jets identified as originating from b-quarks in a data sample of 36.1 fb−1 of pp collisions at \( \sqrt{s}=13 \) TeV recorded by the ATLAS detector at the Large Hadron Collider is reported. No significant excess is found and limits are set on vector-like quark, four-top-quark, and same...

Measurement of the \( Z\gamma \to \nu \overline{\nu}\gamma \) production cross section in pp collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector and limits on anomalous triple gauge-boson couplings

Abstract The production of Z bosons in association with a high-energy photon (Zγ production) is studied in the neutrino decay channel of the Z boson using pp collisions at \( \sqrt{s}=13 \) TeV. The analysis uses a data sample with an integrated luminosity of 36.1fb−1 collected by the ATLAS detector at the LHC in 2015 and 2016. Candidate Zγ events with invisible decays of the Z...

Search for dark matter in events with a hadronically decaying vector boson and missing transverse momentum in pp collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector

Abstract A search for dark matter (DM) particles produced in association with a hadronically decaying vector boson is performed using pp collision data at a centre-of-mass energy of \( \sqrt{s}=13 \) TeV corresponding to an integrated luminosity of 36.1 fb−1, recorded by the ATLAS detector at the Large Hadron Collider. This analysis improves on previous searches for processes...

Angular analysis of B d 0  → K∗μ+μ− decays in pp collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector

Abstract An angular analysis of the decay B d 0  → K∗μ+μ− is presented, based on proton-proton collision data recorded by the ATLAS experiment at the LHC. The study is using 20.3 fb−1 of integrated luminosity collected during 2012 at centre-of-mass energy of \( \sqrt{s}=8 \) TeV. Measurements of the K* longitudinal polarisation fraction and a set of angular parameters obtained...

Search for the Higgs boson produced in association with a vector boson and decaying into two spin-zero particles in the H → aa → 4b channel in pp collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector

Abstract A search for exotic decays of the Higgs boson into a pair of spin-zero particles, H → aa, where the a-boson decay sin to b-quarks promptly or with a mean proper lifetime cτa up to 6 mm and has a mass in the range of 20–60 GeV, is presented. The search is performed in events where the Higgs boson is produced in association with a W or Z boson, giving rise to a signature...

Search for charged Higgs bosons decaying via H± → τ±ντ in the τ+jets and τ+lepton final states with 36 fb−1 of pp collision data recorded at \( \sqrt{s}=13 \) TeV with the ATLAS experiment

Abstract Charged Higgs bosons produced either in top-quark decays or in association with a top-quark, subsequently decaying via H± → τ±ντ, are searched for in 36.1 fb−1 of proton-proton collision data at \( \sqrt{s}=13 \) TeV recorded with the ATLAS detector. Depending on whether the top-quark produced together with H± decays hadronically or leptonically, the search targets...

Search for supersymmetry in final states with charm jets and missing transverse momentum in 13 TeV pp collisions with the ATLAS detector

Abstract A search for supersymmetric partners of top quarks decaying as \( {\tilde{t}}_1\to c{\tilde{\upchi}}_1^0 \) and supersymmetric partners of charm quarks decaying as \( {\tilde{c}}_1\to c{\tilde{\upchi}}_1^0 \), where \( {\tilde{\upchi}}_1^0 \) is the lightest neutralino, is presented. The search uses 36.1 fb−1 pp collision data at a centre-of-mass energy of 13 TeV...

Measurements of b-jet tagging efficiency with the ATLAS detector using \( t\overline{t} \) events at \( \sqrt{s}=13 \) TeV

Abstract The efficiency to identify jets containing b-hadrons (b-jets) is measured using a high purity sample of dileptonic top quark-antiquark pairs (\( t\overline{t} \)) selected from the 36.1 fb−1 of data collected by the ATLAS detector in 2015 and 2016 from proton-proton collisions produced by the Large Hadron Collider at a centre-of-mass energy \( \sqrt{s}=13 \) TeV. Two...

Search for flavour-changing neutral current top-quark decays t → qZ in proton-proton collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector

Abstract A search for flavour-changing neutral-current processes in top-quark decays is presented. Data collected with the ATLAS detector from proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of \( \sqrt{s}=13 \) TeV, corresponding to an integrated luminosity of 36.1 fb−1, are analysed. The search is performed using top-quark pair events, with one...

Search for exclusive Higgs and Z boson decays to ϕγ and ργ with the ATLAS detector

Abstract A search for the exclusive decays of the Higgs and Z bosons to a ϕ or ρ meson and a photon is performed with a pp collision data sample corresponding to an integrated luminosity of up to 35.6 fb−1 collected at \( \sqrt{s}=13 \) TeV with the ATLAS detector at the CERN Large Hadron Collider. These decays have been suggested as a probe of the Higgs boson couplings to light...

Search for pair production of up-type vector-like quarks and for four-top-quark events in final states with multiple b-jets with the ATLAS detector

7.2 7.3 9.1 9.2 9.3 10 Conclusion The ATLAS collaboration 1 Introduction Likelihood ts to data Limits on vector-like quark pair production Limits on four-top-quark production the ATLAS [1] and CMS ... , respectively. Previous searches for anomalous tttt production have been performed by the ATLAS Collaboration using the full Run-1 dataset [24, 25], where 95% CL limits of jC4tj= 2 < 6:6 TeV 2 and mKK > 1:1 TeV