Observation of tt[over ¯]H Production

Sirunyan, A; Tumasyan, A; Adam, W; Ambrogi, F; Asilar, E; Bergauer, T; Brandstetter, J; Dragicevic, M; Erö, J; Escalante Del Valle, A; Flechl, M; Frühwirth, R; Ghete, V; Hrubec, J; Jeitler, M; Krammer, N; Krätschmer, I; Liko, D; Madlener, T; Mikulec, I; Rad, N; Rohringer, H; Schieck, J; Schöfbeck, R; Spanring, M; Spitzbart, D; Taurok, A; Waltenberger, W; Wittmann, J; Wulz, C; Zarucki, M; Chekhovsky, V; Mossolov, V; Suarez Gonzalez, J; De Wolf, E; Di Croce, D; Janssen, X; Lauwers, J; Pieters, M; Van De Klundert, M; Van Haevermaet, H; Van Mechelen, P; Van Remortel, N; Abu Zeid, S; Blekman, F; D'Hondt, J; De Bruyn, I; De Clercq, J; Deroover, K; Flouris, G; Lontkovskyi, D; Lowette, S; Marchesini, I; Moortgat, S; Moreels, L; Python, Q; Skovpen, K; Tavernier, S; Van Doninck, W; Van Mulders, P; Van Parijs, I; Beghin, D; Bilin, B; Brun, H; Clerbaux, B; De Lentdecker, G; Delannoy, H; Dorney, B; Fasanella, G; Favart, L; Goldouzian, R; Grebenyuk, A; Kalsi, A; Lenzi, T; Luetic, J; Postiau, N; Starling, E; 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Lee, S; Moon, C; Y D, O; Sekmen, S; Son, D; Yang, Y; Kim, H; Moon, D; Oh, G; Goh, J; Kim, T; Cho, S; Choi, S; Go, Y; Gyun, D; Ha, S; Hong, B; Jo, Y; Lee, K; Lee, K; Lee, S; Lim, J; Park, S; Roh, Y; Kim, H; Almond, J; Kim, J; Kim, J; Lee, H; Lee, K; Nam, K; S B, O; Radburn-Smith, B; Seo, S; Yang, U; Yoo, H; G B, Y; Jeon, D; Kim, H; Kim, J; Lee, J; Park, I; Choi, Y; Hwang, C; Lee, J; Yu, I; Dudenas, V; Juodagalvis, A; Vaitkus, J; Ahmed, I; Ibrahim, Z; Md Ali, M; Mohamad Idris, F; Wan Abdullah, W; Yusli, M; Zolkapli, Z; Castaneda Hernandez, A; Murillo Quijada, J; Reyes-Almanza, R; Ramirez-Sanchez, G; Duran-Osuna, M; Castilla-Valdez, H; De La Cruz-Burelo, E; Heredia-De La Cruz, I; Rabadan-Trejo, R; Lopez-Fernandez, R; Mejia Guisao, J; Ramirez-Garcia, M; Sanchez-Hernandez, A; Carrillo Moreno, S; Oropeza Barrera, C; Vazquez Valencia, F; Eysermans, J; Pedraza, I; Salazar Ibarguen, H; Uribe Estrada, C; Morelos Pineda, A; Krofcheck, D; Bheesette, S; Butler, P; Ahmad, A; Ahmad, M; Asghar, M; Hassan, Q; 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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.

Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., et al. (2018). Observation of tt[over ¯]H Production. PHYSICAL REVIEW LETTERS, 120(23), 231801 [10.1103/PhysRevLett.120.231801].