Observation of tt[over ¯]H Production

• Published in: Physical review letters Vol. 120; no. 23; p. 231801
• Main Authors: Adam, W, D'Hondt, J, Brun, H, Cornelis, T, Giammanco, A, Lemaitre, V, Rebello Teles, P, Ahuja, S, Bian, J G, Courbon, B, Faure, J L, Leloup, C, Rosowsky, A, Antropov, I, Granier de Cassagnac, R, Le Bihan, A-C, Gouzevitch, M, Klein, K, Duchardt, D, Nowack, A, Costanza, F, Gunnellini, P, Jung, H, Singh, A, Wissing, C, De Boer, W, Katkov, I, Wöhrmann, C, Filipovic, N, Mal, P, Sahoo, D K, Singh, J B, Bhawandeep, U, Mondal, K, Thakur, S, Hegde, V, Ince, M, Tosi, N, Tuve, C, Focardi, E, Buontempo, S, Bragagnolo, A, Pozzobon, N, Cavallari, F, Cipriani, M, Argiro, S, Cartiglia, N, Casarsa, M, Gyun, D, Lee, K, Juodagalvis, A, Castaneda Hernandez, A, Pedraza, I, Uribe Estrada, C, Olszewski, M, Stepennov, A, Babaev, A, García Alonso, A, Bendavid, J, Botta, C, David, A, Pitters, F M, Steggemann, J, Dissertori, G, Zhu, D H, Amsler, C, De Cosa, A, Suwonjandee, N, Isik, C, Ozturk, S, Tali, B, Kaya, O, Clement, E, Richards, A, Virdee, T, Dominguez, A, Tos, K, Dutta, V, Ovcharova, A, Chaves, J, Vaandering, E W, Verzocchi, M, Saha, A, Snyder, C, You, C, Al-Bataineh, A, Tonwar, S C, Busza, W, Siado, J E, Parker, A, Kellams, N, Musienko, Y, Bylsma, B, Hill, C, Qiu, H, Parashar, N, Lo, K H, Spanier, S, Gurrola, A, Woods, N
• Format: Journal Article
• Language: English
• Published: United States 08.06.2018
• ISSN: 1079-7114
• DOI: 10.1103/PhysRevLett.120.231801

The observation of Higgs boson production in association with a top quark-antiquark pair is reported, based on a combined analysis of proton-proton collision data at center-of-mass energies of sqrt[s]=7, 8, and 13 TeV, corresponding to integrated luminosities of up to 5.1, 19.7, and 35.9  fb^{-1}, respectively. The data were collected with the CMS detector at the CERN LHC. The results of statistically independent searches for Higgs bosons produced in conjunction with a top quark-antiquark pair and decaying to pairs of W bosons, Z bosons, photons, τ leptons, or bottom quark jets are combined to maximize sensitivity. An excess of events is observed, with a significance of 5.2 standard deviations, over the expectation from the background-only hypothesis. The corresponding expected significance from the standard model for a Higgs boson mass of 125.09 GeV is 4.2 standard deviations. The combined best fit signal strength normalized to the standard model prediction is 1.26_{-0.26}^{+0.31}.