Search for associated production of a Z boson with an invisibly decaying Higgs boson or dark matter candidates at s=13 TeV with the ATLAS detector

Search for associated production of a Z boson with an invisibly decaying Higgs boson or dark matter candidates at s=13 TeV with the ATLAS detector

A search for invisible decays of the Higgs boson as well as searches for dark matter candidates, produced together with a leptonically decaying Zboson, are presented. The analysis is performed using proton−proton collisions at a centre-of-mass energy of 13TeV, delivered by the LHC, corresponding to...

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Hauptverfasser: Achkar, B, Akimov, A.V, Anastopoulos, C, Backman, F, Bakos, E, Bandyopadhyay, A, Bassalat, A, Bednyakov, V.A, Bingul, A, Blocker, C, Buxo Vazquez, Vazquez, Cakir, O, Carquin, E, Casadei, D, Chow, Y.S, Christopher, L.D, Dabrowski, W, Dandoy, J.R, Dingfelder, J, Duda, D, Dungs, S, Fanti, M, Faucci Giannelli, Giannelli, Ferrari, A, Fomin, Nikolai, Francescato, S, Franconi, L, Franklin, M, Gordon, H.A, Grosse-Knetter, J, Guan, W, Hall, J.J, Heggelund, Andreas, Hibi, H, Hinterkeuser, F, Hopkins, W.H, Hoya, J, Huth, J, Izen, J.M, Kalderon, C.W, Kang, S, Khubua, J, Korn, S, Kotwal, A, Krieger, P, Kuchinskaia, O, Kurochkin, Y.A, Kwan, T, Lenz, T, Levin, D, Liu, P, Manthos, I, Maznas, I, Menke, S, Meshreki, J.K.R, Miller, L.S, Miyazaki, Y, Morley, A.K, Nagano, K, Nikolic-Audit, I, Nobe, T, Noel, D.L, Orellana, G.E, Otono, H, Owen, R.E, Pacey, H.A, Parida, B, Peiffer, T, Penzin, M, Petersen, T.C, Pezzullo, G, Rej, A, Rettie, S, Ronzani, M, Rosati, S, Rummler, A, Sabatini, P, Sabetta, L, Salvador Salas, Salas, Sanchez Sebastian, Sebastian, Sbarra, C, Schmieden, K, Schmitt, C, Schmitt, S, Smakhtin, V, Solomon, S, Spagnolo, S, Spousta, M, Stavropoulos, G, Sun, S, Taffard, A, Tikhomirov, V.O, Troncon, C, Tzamarias, S, Vallier, A, Wagner, W, Walker, S.D, Wu, S.L, Yan, J, Yoshihara, K
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Sprache:eng
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Zusammenfassung:A search for invisible decays of the Higgs boson as well as searches for dark matter candidates, produced together with a leptonically decaying Zboson, are presented. The analysis is performed using proton−proton collisions at a centre-of-mass energy of 13TeV, delivered by the LHC, corresponding to an integrated luminosity of 139fb−1and recorded by the ATLAS experiment. Assuming Standard Model cross-sections for ZHproduction, the observed (expected) upper limit on the branching ratio of the Higgs boson to invisible particles is found to be 19% (19%) at the 95% confidence level. Exclusion limits are also set for simplified dark matter models and two-Higgs-doublet models with an additional pseudoscalar mediator.