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Title

Combination of searches for Higgs boson pairs in pp collisions at s=13TeV with the ATLAS detector

AuthorsATLAS Collaboration; Álvarez Piqueras, D. ; Aparisi Pozo, J.A.; Bailey, A.J.; Cabrera, Susana;; Castillo, F.L.; Castillo Mª Victoria; Cerda Alberich, L.; Costa, María José ; Escobar, Carlos ; Estrada, Oscar; Ferrer, Antonio ; Fiorini, L. ; Fullana, Esteban ; Fuster, Juan ; García García, Carmen ; García Navarro, José Enrique ; González de la Hoz, Santiago ; Gonzalvo Rodríguez, Galo Rafael; Guerrero Rojas, J.G.R.; Higón, Emilio ; Lacasta Llácer, Carlos ; Lozano Bahilo, José J.; Madaffari, Daniele; Mamuzic, Judita; Martí García, Salvador ; Melini, Davide; Miñano Moya, M.; Mitsou, Vasiliki A. ; Rodriguez Bosca, S.; Rodriguez Rodriguez, D.; Ruiz Martínez, Arantxa ; Salt, José ; Santra, A.; Soldevila, Urmila ; Sánchez Martínez, Javier ; Valero, Alberto ; Valls Ferrer, Juan Antonio ; Vos, Marcel
Issue DateJan-2020
PublisherElsevier BV
CitationPHYSICS LETTERS B 800: 135103 (2020)
AbstractThis letter presents a combination of searches for Higgs boson pair production using up to 36.1 fb of proton–proton collision data at a centre-of-mass energy s=13 TeV recorded with the ATLAS detector at the LHC. The combination is performed using six analyses searching for Higgs boson pairs decaying into the bb¯bb¯, bb¯WW, bb¯ττ, WWWW, bb¯γγ and WWγγ final states. Results are presented for non-resonant and resonant Higgs boson pair production modes. No statistically significant excess in data above the Standard Model predictions is found. The combined observed (expected) limit at 95% confidence level on the non-resonant Higgs boson pair production cross-section is 6.9 (10) times the predicted Standard Model cross-section. Limits are also set on the ratio (κ) of the Higgs boson self-coupling to its Standard Model value. This ratio is constrained at 95% confidence level in observation (expectation) to −5.0<κ<12.0 (−5.8<κ<12.0). In addition, limits are set on the production of narrow scalar resonances and spin-2 Kaluza–Klein Randall–Sundrum gravitons. Exclusion regions are also provided in the parameter space of the habemus Minimal Supersymmetric Standard Model and the Electroweak Singlet Model.
Publisher version (URL)http://dx.doi.org/10.1016/j.physletb.2019.135103
URIhttp://hdl.handle.net/10261/233404
Identifiersdoi: 10.1016/j.physletb.2019.135103
issn: 0370-2693
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