Search for associated production of a Z boson with an invisibly decaying Higgs boson or dark matter candidates at √s=13TeV with the ATLAS detector Aad, G. Aguilar Saavedra, Juan Antonio Rodríguez Chala, Mikael Atlas Collaboration We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Ar-menia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbai-jan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; ANID, Chile; CAS, MOST and NSFC, China; Min-ciencias, Colombia; MEYS CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS and CEA-DRF/IRFU, France; SRNSFG, Geor-gia; BMBF, HGF and MPG, Germany; GSRI, Greece; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Nor-way; MEiN, Poland; FCT, Portugal; MNE/IFA, Romania; JINR; MES of Russia and NRC KI, Russian Federation; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DSI/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Canton of Bernand Canton of Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have re-ceived support from BCKDF, Canarie, Compute Canada and CRC, Canada; COST, ERC, ERDF, Horizon 2020 and Marie Skłodowska-Curie Actions, European Union; Investissements d’Avenir Labex, In-vestissements d’Avenir Idex and ANR, France; DFG and AvH Foun-dation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and GIF, Israel; Norwegian Financial Mechanism 2014-2021, Norway; NCN and NAWA, Poland; La Caixa Banking Foundation, CERCA Pro-gramme Generalitat de Catalunya and PROMETEO and GenT Pro-grammes Generalitat Valenciana, Spain; Göran Gustafssons Stif-telse, Sweden; The Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is ac-knowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in Ref.[109]. 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. 2022-05-27T07:32:10Z 2022-05-27T07:32:10Z 2022-04-04 journal article Aad, G... [et al.]. 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, Physics Letters B, Volume 829, 2022, 137066, ISSN 0370-2693, [https://doi.org/10.1016/j.physletb.2022.137066] http://hdl.handle.net/10481/75008 10.1016/j.physletb.2022.137066 eng http://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España Elsevier