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  • Observation of Higgs boson ...
    Adye, T.; Akatsuka, S.; Alimonti, G.; Alvarez Gonzalez, B.; Antrim, D.J.A.; Arnold, H.; Avramidou, R.; Barton, A.E.; Berta, P.; Bethke, S.; Bloch, I.; Bourdarios, C.; Boutle, S.K.; Buanes, T.; Bulekov, O.; Cakir, O.; Camarda, S.; Carquin, E.; Chen, J.; Chitan, A.; Chiu, I.; Constantinescu, S.; Danninger, M.; Dawe, E.; Dietrich, J.; Doyle, A.T.; Drechsler, E.; Ellajosyula, V.; Falke, S.; Fawcett, W.J.; Feligioni, L.; Gallus, P.; Gray, C.; Hakobyan, H.; Haug, S.; Heelan, L.; Hellman, S.; Helsens, C.; Hessey, N.P.; Hohn, D.; Hyneman, R.; Iengo, P.; Iltzsche, F.; Introzzi, G.; Jones, S.D.; Kaplan, B.; Kharlamova, T.; Kono, T.; Kourkoumeli-Charalampidi, A.; Krasnopevtsev, D.; Krüger, H.; Laudrain, A.; Lemmer, B.; Li, C.-Q.; Liberti, B.; Loesle, A.; Lou, X.; Martinez, M.; Mc Goldrick, G.; Mondragon, M.C.; Mönig, K.; Mount, R.; Narayan, R.; Okawa, H.; Okumura, Y.; Perini, L.; Pinamonti, M.; Pralavorio, P.; Price, D.; Protopopescu, S.; Queitsch-Maitland, M.; Raspopov, S.; Read, A.L.; Ripellino, G.; Rivera Vergara, J.C.; Sandaker, H.; Schernau, M.; Schnoor, U.; Schoeffel, L.; Schumm, B.A.; Schwarz, T.A.; Sekhon, K.; Severini, H.; Shaikh, N.W.; Shan, L.Y.; Stupak, J.; Tisserant, S.; Tokár, S.; Torrence, E.; Toth, J.; Vazquez Furelos, D.; Vecchio, V.; Vuillermet, R.; Whalen, K.; Winklmeier, F.; Wolter, M.W.; Wu, S.L.; Yang, Z.; Zaripovas, D.R.; Zhang, Z.

    Physics letters. B, 2018, Letnik: 784, Številka: C
    Journal Article

    The observation of Higgs boson production in association with a top quark pair (tt¯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 bb¯, WW⁎, τ+τ−, γγ, and ZZ⁎, the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the tt¯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 tt¯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.