1790 documents found, page 1 of 179
Search for an axion-like particle with forward proton scattering in association...
Castro, Nuno Filipe; Onofre, A.; ATLAS CollaborationA search for forward proton scattering in association with light-by-light scattering mediated by an axion-like particle is presented, using the ATLAS Forward Proton spectrometer to detect scattered protons and the central ATLAS detector to detect pairs of outgoing photons. Proton-proton collision data recorded in 2017 at a centre-of-mass energy of s = 13 TeV were analysed, corresponding to an integrated luminos...
Searches for new phenomena in events with two leptons, jets, and missing transv...
Castro, Nuno Filipe; Onofre, A.; ATLAS CollaborationSearches for new phenomena inspired by supersymmetry in final states containing an e+e- or μ+μ- pair, jets, and missing transverse momentum are presented. These searches make use of proton–proton collision data with an integrated luminosity of 139fb-1 , collected during 2015–2018 at a centre-of-mass energy s=13 TeV by the ATLAS detector at the Large Hadron Collider. Two searches target the pair production of ch...
Search for leptoquarks decaying into the bτ final state in pp collisions at √s ...
Castro, Nuno Filipe; Onofre, A.; ATLAS CollaborationA search for leptoquarks decaying into the bτ final state is performed using Run 2 proton-proton collision data from the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb −1 at s = 13 TeV recorded by the ATLAS detector. The benchmark models considered in this search are vector leptoquarks with electric charge of 2/3e and scalar leptoquarks with an electric charge of 4/3e. No significant...
Evidence for the charge asymmetry in (Formula presented.) production at √s = 13...
Castro, Nuno Filipe; Onofre, A.; ATLAS CollaborationInclusive and differential measurements of the top–antitop (Formula presented.) charge asymmetry (Formula presented.) and the leptonic asymmetry (Formula presented.) are presented in proton–proton collisions at s = 13 TeV recorded by the ATLAS experiment at the CERN Large Hadron Collider. The measurement uses the complete Run 2 dataset, corresponding to an integrated luminosity of 139 fb−1, combines data in the...
Determination of the strong coupling constant from transverse energy-energy cor...
Castro, Nuno Filipe; Onofre, A.; ATLAS CollaborationMeasurements of transverse energy-energy correlations and their associated azimuthal asymmetries in multijet events are presented. The analysis is performed using a data sample corresponding to 139 fb −1 of proton-proton collisions at a centre-of-mass energy of s = 13 TeV, collected with the ATLAS detector at the Large Hadron Collider. The measurements are presented in bins of the scalar sum of the transverse m...
Measurement of the sensitivity of two-particle correlations in pp collisions to...
Castro, Nuno Filipe; Onofre, A.; ATLAS CollaborationA key open question in the study of multiparticle production in high-energy pp collisions is the relationship between the "ridge"-i.e., the observed azimuthal correlations between particles in the underlying event that extend over all rapidities-and hard or semihard scattering processes. In particular, it is not known whether jets or their soft fragments are correlated with particles in the underlying event. To...
Measurement of cross sections for production of a Z boson in association with a...
Castro, Nuno Filipe; Onofre, A.; ATLAS CollaborationWe present measurements of cross sections for production of a leptonically decaying Z boson in association with a large-radius jet in 13 TeV proton-proton collisions at the LHC, using 36 fb - 1 of data from the ATLAS detector. Integrated and differential cross sections are measured at particle level in both a flavor inclusive and a doubly b -tagged fiducial phase space. The large-radius jet mass and transverse ...
Observation of the γγ→ττ Process in Pb+Pb Collisions and Constraints on the τ-L...
Castro, Nuno Filipe; Onofre, A.; ATLAS CollaborationThis Letter reports the observation of τ-lepton-pair production in ultraperipheral lead-lead collisions Pb+Pb→Pb(γγ→ττ)Pb and constraints on the τ-lepton anomalous magnetic moment a_{τ}. The dataset corresponds to an integrated luminosity of 1.44 nb^{-1} of LHC Pb+Pb collisions at sqrt[s_{NN}]=5.02 TeV recorded by the ATLAS experiment in 2018. Selected events contain one muon from a τ-lepton decay, an electro...
Search for resonant and non-resonant Higgs boson pair production in the bb¯ τ<s...
Castro, Nuno Filipe; Onofre, A.; ATLAS CollaborationA search for Higgs boson pair production in events with two b-jets and two τ-leptons is presented, using a proton–proton collision dataset with an integrated luminosity of 139 fb −1 collected at s = 13 TeV by the ATLAS experiment at the LHC. Higgs boson pairs produced non-resonantly or in the decay of a narrow scalar resonance in the mass range from 251 to 1600 GeV are targeted. Events in which at least one τ-l...
Search for pair-produced vector-like top and bottom partners in events with lar...
Castro, Nuno Filipe; Onofre, A.; ATLAS CollaborationA search for pair-produced vector-like quarks using events with exactly one lepton (e or μ), at least four jets including at least one b-tagged jet, and large missing transverse momentum is presented. Data from proton–proton collisions at a centre-of-mass energy of s= 13 TeV , recorded by the ATLAS detector at the LHC from 2015 to 2018 and corresponding to an integrated luminosity of 139 fb - 1 , are analysed. ...