74 research outputs found

    Measurement of vector boson production cross sections and their ratios using pp collisions at s=13.6 TeV with the ATLAS detector

    Get PDF

    Search for heavy neutral Higgs bosons decaying into a top quark pair in 140 fb−1 of proton-proton collision data at s \sqrt{s} = 13 TeV with the ATLAS detector

    Get PDF

    Search for heavy Majorana neutrinos in e±e± and e±Ό± final states via WW scattering in pp collisions at s=13 TeV with the ATLAS detector

    Get PDF

    Beam-induced backgrounds measured in the ATLAS detector during local gas injection into the LHC beam vacuum

    Get PDF

    Search for non-resonant Higgs boson pair production in final states with leptons, taus, and photons in pp collisions at s \sqrt{s} = 13 TeV with the ATLAS detector

    Get PDF

    Accuracy versus precision in boosted top tagging with the ATLAS detector

    Get PDF

    Search for decays of the Higgs boson into a pair of pseudoscalar particles decaying into bbÂŻÏ„+τ− using pp collisions at √s = 13 TeV with the ATLAS detector

    Get PDF
    This paper presents a search for exotic decays of the Higgs boson into a pair of new pseudoscalar particles, H → aa, where one pseudoscalar decays into a b-quark pair and the other decays into a τ-lepton pair, in the mass range 12 ≀ ma ≀ 60 GeV. The analysis uses pp collision data at √s = 13 TeV collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 140 fb−1. No significant excess above the Standard Model (SM) prediction is observed. Assuming the SM Higgs boson production cross section, the search sets upper limits at 95% confidence level on the branching ratio of Higgs bosons decaying into bbÂŻ τ+τ−, B(H → aa → bbÂŻ τ+τ−), between 2.2% and 3.9% depending on the pseudoscalar mass

    Calibration of a soft secondary vertex tagger using proton-proton collisions at √s = 13 TeV with the ATLAS detector

    Get PDF
    Several processes studied by the ATLAS experiment at the Large Hadron Collider produce low-momentum b-flavored hadrons in the final state. This paper describes the calibration of a dedicated tagging algorithm that identifies b-flavored hadrons outside of hadronic jets by reconstructing the soft secondary vertices originating from their decays. The calibration is based on a proton-proton collision dataset at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 140  fb−1. Scale factors used to correct the algorithm’s performance in simulated events are extracted for the b-tagging efficiency and the mistag rate of the algorithm using a data sample enriched in tt¯ events. Several orthogonal measurement regions are defined, binned as a function of the multiplicities of soft secondary vertices and jets containing a b-flavored hadron in the event. The mistag rate scale factors are estimated separately for events with low and high average numbers of interactions per bunch crossing. The results, which are derived from events with low missing transverse momentum, are successfully validated in a phase space characterized by high missing transverse momentum and therefore are applicable to new physics searches carried out in either phase space regime
    • 

    corecore