2018/06/30 by ATLAS Collaboration, M. Aaboud, G. Aad +98 · 2 citations
Physics and Astronomy · #ATLAS experiment #Atlas (anatomy) #Atlas detector #Boson #Branching fraction #Higgs boson #High-Energy Particle Collisions Research #Large Hadron Collider #Nuclear physics #Pair production #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Physics #Standard Model (mathematical formulation) #Top quark #hep-ex
paper · pdf · doi:10.1016/j.physletb.2018.07.035
published as Phys. Lett. B 784 (2018) 173 · 34 pages in total, author list starting page 18, 6 figures, 3 tables, published in PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2018-13
openalex created_date 2018/07/10 · openalex publication_date 2018/07/24 · arxiv created 2018/08/14 · arxiv updated 2018/08/15 · openalex updated_date 2026/08/06
The observation of Higgs boson production in association with a top quark pair ( t t ¯ H ), based on the analysis of proton–proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb −1 , and considering Higgs boson decays into b b ¯ , W W ⁎ , τ + τ − , γγ , and Z Z ⁎ , the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the t t ¯ H searches using a dataset corresponding to integrated luminosities of 4.5 fb −1 at 7 TeV and 20.3 fb −1 at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total t t ¯ H production cross section at 13 TeV is measured to be 670 ± 90 (stat.) − 100 + 110 (syst.) fb, in agreement with the Standard Model prediction.