82 research outputs found
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Observation of Single-Top-Quark Production in Association with a Photon Using the ATLAS Detector
This Letter reports the observation of single top quarks produced together with a photon, which directly probes the electroweak coupling of the top quark. The analysis uses 139  fb−1 of 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. Requiring a photon with transverse momentum larger than 20 GeV and within the detector acceptance, the fiducial cross section is measured to be 688±23(stat) +75−71(syst)  fb, to be compared with the standard model prediction of 515+36−42  fb at next-to-leading order in QCD
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Observation of the γ γ → τ τ Process in Pb + Pb Collisions and Constraints on the τ -Lepton Anomalous Magnetic Moment with the ATLAS Detector
Evaluation of the efficacy and reproducibility of cholangiopancreatography by magnetic resonance for detecting biliary complications following orthotopic liver transplantation
Rationale, study design, and analysis plan of the Alveolar Recruitment for ARDS Trial (ART): Study protocol for a randomized controlled trial
Background: Acute respiratory distress syndrome (ARDS) is associated with high in-hospital mortality. Alveolar recruitment followed by ventilation at optimal titrated PEEP may reduce ventilator-induced lung injury and improve oxygenation in patients with ARDS, but the effects on mortality and other clinical outcomes remain unknown. This article reports the rationale, study design, and analysis plan of the Alveolar Recruitment for ARDS Trial (ART). Methods/Design: ART is a pragmatic, multicenter, randomized (concealed), controlled trial, which aims to determine if maximum stepwise alveolar recruitment associated with PEEP titration is able to increase 28-day survival in patients with ARDS compared to conventional treatment (ARDSNet strategy). We will enroll adult patients with ARDS of less than 72 h duration. The intervention group will receive an alveolar recruitment maneuver, with stepwise increases of PEEP achieving 45 cmH(2)O and peak pressure of 60 cmH2O, followed by ventilation with optimal PEEP titrated according to the static compliance of the respiratory system. In the control group, mechanical ventilation will follow a conventional protocol (ARDSNet). In both groups, we will use controlled volume mode with low tidal volumes (4 to 6 mL/kg of predicted body weight) and targeting plateau pressure <= 30 cmH2O. The primary outcome is 28-day survival, and the secondary outcomes are: length of ICU stay; length of hospital stay; pneumothorax requiring chest tube during first 7 days; barotrauma during first 7 days; mechanical ventilation-free days from days 1 to 28; ICU, in-hospital, and 6-month survival. ART is an event-guided trial planned to last until 520 events (deaths within 28 days) are observed. These events allow detection of a hazard ratio of 0.75, with 90% power and two-tailed type I error of 5%. All analysis will follow the intention-to-treat principle. Discussion: If the ART strategy with maximum recruitment and PEEP titration improves 28-day survival, this will represent a notable advance to the care of ARDS patients. Conversely, if the ART strategy is similar or inferior to the current evidence-based strategy (ARDSNet), this should also change current practice as many institutions routinely employ recruitment maneuvers and set PEEP levels according to some titration method.Hospital do Coracao (HCor) as part of the Program 'Hospitais de Excelencia a Servico do SUS (PROADI-SUS)'Brazilian Ministry of Healt
Higgs boson measurements in its decays into bosons with the ATLAS experiment
Recent Higgs boson measurements using the H->ZZ, H->WW, H->yy, and H->Zy decay channels are reviewed
Higgs total width at the ATLAS experiment
With a value of about 4 MeV, the total width of the Higgs boson in the Standard Model is not accessible via direct measurements at the LHC as the experimental resolution is around 1 GeV.Instead, a comparison of off-shell and on-shell Higgs boson production can reveal the value of the width under mild assumptions on the Higgs boson couplings.This seminar presents a new measurement of the Higgs boson off-shell production and its natural width based on the full Run 2 pp dataset collected at 13 TeV.The measurement exploits the gluon-fusion and vector-boson fusion production modes, and the decays channels into ZZ→4l and ZZ→2l2v. The background-only hypothesis is rejected with an observed (expected) significance of 3.2 (2.4) , which marks the experimental evidence of off-shell Higgs production. </div
Measurement of CP properties of the Higgs boson coupling to weak bosons using diphoton and four lepton decays at the ATLAS experiment
We review recent searches for CP-odd couplings of the Higgs to weak bosons
Dark photons and light (pseudo)scalars at the LHC
This talk reviews dark photons and light (pseudo)scalars searches at the LHC
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