Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector
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Hadron-Hadron scattering (experiments)
The ATLAS collaboration., Aad, G., Abbott, B. et al. Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector. J. High Energ. Phys. 2020, 5 (2020). https://doi.org/10.1007/JHEP11(2020)005
SponsorshipANPCyT; YerPhI, Armenia; Australian Research Council; BMWFW, Austria; Austrian Science Fund (FWF); Azerbaijan National Academy of Sciences (ANAS); SSTC, Belarus; National Council for Scientific and Technological Development (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; NRC, Canada; CERN; ANID, Chile; Chinese Academy of Sciences; Ministry of Science and Technology, China; National Natural Science Foundation of China (NSFC); Departamento Administrativo de Ciencia, Tecnologia e Innovacion Colciencias; Ministry of Education, Youth & Sports - Czech Republic; Czech Republic Government; DNRF, Denmark; Danish Natural Science Research Council; Centre National de la Recherche Scientifique (CNRS); CEA-DRF/IRFU, France; SRNSFG, Georgia; Federal Ministry of Education & Research (BMBF); HGF, Germany; Max Planck Society; Greek Ministry of Development-GSRT; RGC, China; Hong Kong SAR, China; Israel Science Foundation; Benoziyo Center, Israel; 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; Netherlands Organization for Scientific Research (NWO) Netherlands Government; RCN, Norway; Ministry of Science and Higher Education, Poland; NCN, Poland; Portuguese Foundation for Science and Technology; MNE/IFA, Romania; MES of Russia, Russia Federation; NRC KI, Russia Federation; JINR; MESTD, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia; MIZS, Slovenia; DST/NRF, South Africa; Spanish Government; Wallenberg Foundation, Sweden; SERI, Switzerland; Swiss National Science Foundation (SNSF); Canton of Bern, Switzerland; Canton of Geneva, Switzerland; Ministry of Science and Technology, Taiwan; Ministry of Energy & Natural Resources - Turkey; UK Research & Innovation (UKRI) Science & Technology Facilities Council (STFC); United States Department of Energy (DOE); National Science Foundation (NSF); BCKDF, Canada; CANARIE, Canada; Compute Canada, Canada; CRC, Canada; European Union (EU) European Research Council (ERC); European Union (EU); Horizon 2020, European Union; European Union (EU); COST, European Union; French National Research Agency (ANR); German Research Foundation (DFG); Alexander von Humboldt Foundation; Herakleitos programme; Thales programme; Aristeia programme; EU-ESF, Greece; Greek NSRF, Greece; BSF-NSF, Israel; German-Israeli Foundation for Scientific Research and Development; La Caixa Banking Foundation, Spain; CERCA Programme Generalitat de Catalunya, Spain; PROMETEO Programme Generalitat Valenciana, Spain; GenT Programme Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; Royal Society of London; Leverhulme Trust
A search for new physics with non-resonant signals in dielectron and dimuon final states in the mass range above 2 TeV is presented. This is the first search for nonresonant signals in dilepton final states at the LHC to use a background estimate from the data. The data, corresponding to an integrated luminosity of 139 fb−1 , were recorded by the ATLAS experiment in proton-proton collisions at a center-of-mass energy of √ s = 13 TeV during Run 2 of the Large Hadron Collider. The benchmark signal signature is a two-quark and two-lepton contact interaction, which would enhance the dilepton event rate at the TeV mass scale. To model the contribution from background processes a functional form is fit to the dilepton invariant-mass spectra in data in a mass region below the region of interest. It is then extrapolated to a high-mass signal region to obtain the expected background there. No significant deviation from the expected background is observed in the data. Upper limits at 95% CL on the number of events and the visible cross-section times branching fraction for processes involving new physics are provided. Observed (expected) 95% CL lower limits on the contact interaction energy scale reach 35.8 (37.6) TeV.