Constraints on spin-0 dark matter mediators and invisible Higgs decays using ATLAS 13 TeV pp collision data with two top quarks and missing transverse momentum in the final state
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Springer Nature
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2023-06-13Referencia bibliográfica
Aad, G., Abbott, B., Abbott, D.C. et al. Constraints on spin-0 dark matter mediators and invisible Higgs decays using ATLAS 13 TeV pp collision data with two top quarks and missing transverse momentum in the final state. Eur. Phys. J. C 83, 503 (2023). [https://doi.org/10.1140/epjc/s10052-023-11477-z]
Patrocinador
SCOAP3; CERN; ANPCyT; YerPhI, Armenia; Australian Research Council; BMWFW; Austrian Science Fund (FWF); Azerbaijan National Academy of Sciences (ANAS); Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); Natural Sciences and Engineering Research Council of Canada (NSERC); Canada Foundation for Innovation; National Natural Science Foundation of China (NSFC); MEYS CR, Czech Republic; DNRF; Danish Natural Science Research Council; Centre National de la Recherche Scientifique (CNRS); CEA-DRF/IRFU, France; Federal Ministry of Education & Research (BMBF); Max Planck Society; RGC and Hong Kong SAR, China; Israel Science Foundation; Istituto Nazionale di Fisica Nucleare (INFN); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MEiN, Poland; Fundacao para a Ciencia e a Tecnologia (FCT); MNE/IFA, Romania; Ministry of Education, Science & Technological Development, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia; MIZS, Slovenia; Spanish Government; SRC andWallenberg Foundation, Sweden; Swiss National Science Foundation (SNSF); Ministry of Science and Technology, Taiwan; United States Department of Energy (DOE); National Science Foundation (NSF); BCKDF; CANARIE; CRC, Canada PRIMUS 21/SCI/017 UNCE SCI/013; Czech Republic Government; European Research Council (ERC); European Union (EU); Agence Nationale de la Recherche (ANR); German Research Foundation (DFG); Alexander von Humboldt Foundation; Greek NSRF, Greece; BSF-NSF; NCNandNAWA, Poland; La Caixa Foundation; CERCA Programme Generalitat de Catalunya; PROMETEO; Center for Forestry Research & Experimentation (CIEF); Goran Gustafssons Stiftelse, Sweden; Royal Society; Leverhulme Trust; NDGF (Denmark, Norway, Sweden); KIT/GridKA (Germany); INFN-CNAF (Italy); NL-T1 (Netherlands), PIC (Spain); ASGC (Taiwan); BNL (USA)Resumen
This paper presents a statistical combination of searches targeting final states with two top quarks and invisible particles, characterised by the presence of zero, one or two leptons, at least one jet originating from a b-quark and missing transverse momentum. The analyses are searches for phenomena beyond the Standard Model consistent with the direct production of dark matter in pp collisions at the LHC, using 139 fb of data collected with the ATLAS detector at a centre-of-mass energy of 13 TeV. The results are interpreted in terms of simplified dark matter models with a spin-0 scalar or pseudoscalar mediator particle. In addition, the results are interpreted in terms of upper limits on the Higgs boson invisible branching ratio, where the Higgs boson is produced according to the Standard Model in association with a pair of top quarks. For scalar (pseudoscalar) dark matter models, with all couplings set to unity, the statistical combination extends the mass range excluded by the best of the individual channels by 50 (25) GeV, excluding mediator masses up to 370 GeV. In addition, the statistical combination improves the expected coupling exclusion reach by 14% (24%), assuming a scalar (pseudoscalar) mediator mass of 10 GeV. An upper limit on the Higgs boson invisible branching ratio of 0.38 () is observed (expected) at 95% confidence level.