A search for invisible decays of the Higgs boson as well as searches for dark matter candidates, produced together with a leptonically decaying Z boson, are presented. The analysis is performed using proton-proton collisions at a centre-of-mass energy of 13 TeV, delivered by the LHC, corresponding to an integrated luminosity of 139 fb(-1) and recorded by the ATLAS experiment. Assuming Standard Model cross-sections for Z H production, 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. (C) 2022 The Author(s). Published by Elsevier B.V.

Search for associated production of a Z boson with an invisibly decaying Higgs boson or dark matter candidates at TeV with the ATLAS detector / Aad, G., Abbott, B., Abbott, D.C., Abed Abud, A., Abeling, K., Abhayasinghe, D.K., Abidi, S.H., Aboulhorma, A., Abramowicz, H., Abreu, H., Abulaiti, Y., Abusleme Hoffman, A.C., Acharya, B.S., Achkar, B., Adam, L., Adam Bourdarios, C., Adamczyk, L., Adamek, L., Addepalli, S.V., Adelman, J., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 829:(2022). [10.1016/j.physletb.2022.137066]

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

G. Artoni;P. Bagnaia;A. Betti;C. Bini;M. Carnesale;A. Di Domenico;P. Gauzzi;S. Gentile;S. Giagu;M. Kado;F. Lacava;C. Luci;L. Martinelli;
2022

Abstract

A search for invisible decays of the Higgs boson as well as searches for dark matter candidates, produced together with a leptonically decaying Z boson, are presented. The analysis is performed using proton-proton collisions at a centre-of-mass energy of 13 TeV, delivered by the LHC, corresponding to an integrated luminosity of 139 fb(-1) and recorded by the ATLAS experiment. Assuming Standard Model cross-sections for Z H production, 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. (C) 2022 The Author(s). Published by Elsevier B.V.
2022
higgs boso; dark matter; proton proton collisions
01 Pubblicazione su rivista::01a Articolo in rivista
Search for associated production of a Z boson with an invisibly decaying Higgs boson or dark matter candidates at TeV with the ATLAS detector / Aad, G., Abbott, B., Abbott, D.C., Abed Abud, A., Abeling, K., Abhayasinghe, D.K., Abidi, S.H., Aboulhorma, A., Abramowicz, H., Abreu, H., Abulaiti, Y., Abusleme Hoffman, A.C., Acharya, B.S., Achkar, B., Adam, L., Adam Bourdarios, C., Adamczyk, L., Adamek, L., Addepalli, S.V., Adelman, J., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 829:(2022). [10.1016/j.physletb.2022.137066]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1655862
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