Search for long-lived neutral particles decaying into lepton jets in proton-proton collisions at √s = 8 TeV with the ATLAS detector
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Aad, G., Abbott, B., Abdallah, J. et al. Search for long-lived neutral particles decaying into lepton jets in proton-proton collisions at s√=8 TeV with the ATLAS detector. J. High Energ. Phys. 2014, 88 (2014). [https://doi.org/10.1007/JHEP11(2014)088]
SponsorshipANPCyT ; YerPhI, Armenia; Australian Research Council; BMWF, 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; NRC, Canada; Canada Foundation for Innovation; CERN; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); Chinese Academy of Sciences; Ministry of Science and Technology, China; National Natural Science Foundation of China; Departamento Administrativo de Ciencia, Tecnologia e Innovacion Colciencias; Ministry of Education, Youth & Sports - Czech Republic; MPO CR; VSC CR; Czech Republic Government; DNRF, Denmark; Danish Natural Science Research Council; Lundbeckfonden; EPLANET; European Research Council (ERC); NSRF; European Union (EU); Centre National de la Recherche Scientifique (CNRS); CEA-DSM/IRFU, France; GNSF, Georgia; Federal Ministry of Education & Research (BMBF) ; German Research Foundation (DFG); HGF, Germany; Max Planck Society; Alexander von Humboldt Foundation; NSRF, Japan; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science; CNRST, Morocco; FOM (The Netherlands) Netherlands Government; Netherlands Organization for Scientific Research (NWO) Netherlands Government; BRF, Norway; RCN, Norway; Ministry of Science and Higher Education, Poland; NCN, Poland; GRICES, Portugal; Portuguese Foundation for Science and Technology; MNE/IFA, Romania; MES of Russia; ROSATOM; Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia; DST/NRF, South Africa; MIZS, Slovenia; MINECO, Spain; SRC, Sweden; Wallenberg Foundation, Sweden; SER, Switzerland; Swiss National Science Foundation (SNSF); Cantons of Bern, Switzerland; Geneva, Switzerland; National Science Council of Taiwan; Ministry of Energy & Natural Resources - Turkey; Royal Society of London; Leverhulme Trust; United States Department of Energy (DOE); National Science Foundation (NSF); ATLAS Tier-1 facilities at TRIUMF (Canada); NDGF (Denmark, Norway, Sweden); CC-IN2P3 (France); KIT/GridKA (Germany); INFN-CNAF (Italy); Netherlands Government; PIC (Spain); ASGC (Taiwan); RAL (U.K.); BNL (U.S.A.); Science & Technology Facilities Council (STFC) ST/K001418/1 ST/M001504/1 ST/J00474X/1 ATLAS Upgrades ST/L001179/1 ST/M002306/1 ATLAS Upgrades ST/I006056/1 ATLAS Upgrade ST/M001733/1 ST/L001209/1 ATLAS Upgrades ST/H001069/2 ST/L00352X/1 ST/L003414/1 ST/I000178/1 ST/K001426/1 ATLAS ST/L006464/1 ST/I00372X/1 ST/L001179/1 ATLAS Upgrade ST/M002306/1 ST/K001248/1 ST/I006056/1 1104906 ATLAS PP/D002915/1 ST/H001085/2 ST/J00474X/1 ST/K001302/1 ST/J005487/1 ST/I00372X/1 GRIDPP ST/J005525/1 ST/K001396/1 ATLAS ST/M001474/1 PP/E002846/1 ST/M002071/1 ATLAS Upgrades ST/M000761/1 ST/K001264/1 ATLAS ST/K001329/1 GRIDPP PP/E000444/1 ST/G50228X/1 ST/K00140X/1 ST/I006056/1 ATLAS Upgrades ST/K00137X/1 ST/L001179/1 ATLAS Upgrades ST/M007103/1 ATLAS Upgrades; ICREA
Several models of physics beyond the Standard Model predict neutral particles that decay into final states consisting of collimated jets of light leptons and hadrons (socalled “lepton jets”). These particles can also be long-lived with decay length comparable to, or even larger than, the LHC detectors’ linear dimensions. This paper presents the results of a search for lepton jets in proton-proton collisions at the centre-of-mass energy of √s = 8 TeV in a sample of 20.3 fb−1 collected during 2012 with the ATLAS detector at the LHC. Limits on models predicting Higgs boson decays to neutral long-lived lepton jets are derived as a function of the particle’s proper decay length.