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Título: | Search for t t ¯ H production in the H → b b ¯ decay channel with leptonic t t ¯ decays in proton-proton collisions at √s=13 TeV |
Autor: | Brochero Cifuentes, J. A. CSIC ORCID; Cabrillo, I. J. CSIC ORCID ; Calderon, Alicia ; Chazin Quero, B. CSIC; Duarte Campderros, J. CSIC ORCID ; Fernández-García, Marcos CSIC ORCID ; Fernández Manteca, P. J. CSIC ORCID; García Alonso, A. CSIC ORCID; García-Ferrero, J. CSIC ; Gómez, Gervasio CSIC ORCID ; López Virto, A. CSIC ORCID ; Marco, Jesús CSIC ORCID ; Martínez-Rivero, Celso CSIC ORCID ; Martínez Ruiz del Arbol, P. CSIC ORCID; Matorras, Francisco CSIC ORCID ; Piedra, Jonatan CSIC ORCID ; Prieels, C. CSIC; Rodrigo, Teresa CSIC ORCID ; Ruiz Jimeno, Alberto CSIC ORCID ; Scodellaro, Luca CSIC ORCID ; Trevisani, N. CSIC ORCID ; Vila, Iván CSIC ORCID; Vilar Cortabitarte, R. CSIC ORCID | Palabras clave: | Hadron-Hadron scattering (experiments) Higgs physics Top physics |
Fecha de publicación: | 5-mar-2019 | Editor: | Springer Nature | Citación: | Journal of High Energy Physics 2019: 26 (2019) | Resumen: | A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (t¯tH), in which the Higgs boson decays into a b quark-antiquark pair, in proton-proton collisions at a centre-of-mass energy √ s = 13 TeV.The data correspond to an integrated luminosity of 35.9 fb−1 recorded with the CMS detector at the CERN LHC. Candidate t¯tH events are selected that contain either one or two electrons or muons from the t¯t decays and are categorised according to the number of jets. Multivariate techniques are employed to further classify the events and eventually discriminate between signal and background. The results are characterised by an observed t¯tH signal strength relative to the standard model cross section, µ = σ/σSM, under the assumption of a Higgs boson mass of 125 GeV. A combined fit of multivariate discriminant distributions in all categories results in an observed (expected) upper limit on µ of 1.5 (0.9) at 95% confidence level, and a best fit value of 0.72±0.24(stat)±0.38(syst), corresponding to an observed (expected) signal significance of 1.6 (2.2) standard deviations above the background-only hypothesis. | Versión del editor: | http://dx.doi.org/10.1007/JHEP03(2019)026 | URI: | http://hdl.handle.net/10261/213712 | DOI: | 10.1007/JHEP03(2019)026 | Identificadores: | doi: 10.1007/JHEP03(2019)026 e-issn: 1029-8479 issn: 1126-6708 |
Aparece en las colecciones: | (IFCA) Artículos |
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Search_t¯tH production.pdf | 1,58 MB | Adobe PDF | Visualizar/Abrir |
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