Search for long-lived, massive particles in events with a displaced vertex and a muon with large impact parameter in pp collisions at ffiffi s p = 13 TeV with the ATLAS detector
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American Physical Society
Aaboud, M., Aad, G., Abbott, B., Abeloos, B., Abidi, S. H., AbouZeid, O. S., ... & Abulaiti, Y. (2018). Search for long-lived, massive particles in events with displaced vertices and missing transverse momentum in s= 13 TeV p p collisions with the ATLAS detector. Physical Review D, 97(5), 052012. [DOI: 10.1103/PhysRevD.102.032006]
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; Canada Foundation for Innovation; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); 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; Czech Republic Government; DNRF, Denmark; 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; Greek Ministry of Development-GSRT; RGC and 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; RCN, Norway; Ministry of Science and Higher Education, Poland; NCN, Poland; Portuguese Foundation for Science and Technology; MNE/IFA, Romania; NRC KI, Russia Federation; MESTD, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia; MIZS, Slovenia; MINECO, Spain; SRC, Sweden; SNSF Geneva, Switzerland; Ministry of Science and Technology, Taiwan; Ministry of Energy & Natural Resources - Turkey; Science & Technology Facilities Council (STFC); United States Department of Energy (DOE); National Science Foundation (NSF); BCKDF; CANARIE; CRC, Canada; European Research Council (ERC); European Union (EU); French National Research Agency (ANR); German Research Foundation (DFG); Alexander von Humboldt Foundation; Greek NSRF, Greece; BSF-NSF, Israel; German-Israeli Foundation for Scientific Research and Development; CERCA Programme Generalitat de Catalunya, Spain; PROMETEO Programme Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; Royal Society of London; Leverhulme Trust; NRC, Canada; CERN; Chinese Academy of Sciences; Ministry of Science and Technology, China; SRNSFG, Georgia; HGF, Germany; Netherlands Organization for Scientific Research (NWO) Netherlands Government; MES of Russia; JINR; DST/NRF, South Africa; Wallenberg Foundation, Sweden; SERI, Geneva, Switzerland; Cantons of Bern and Geneva, Switzerland; Compute Canada; Horizon 2020; Marie Sklodowska-Curie Actions; European Cooperation in Science and Technology (COST); EU-ESF, Greece
A search for long-lived particles decaying into hadrons and at least one muon is presented. The analysis selects events that pass a muon or missing-transverse-momentum trigger and contain a displaced muon track and a displaced vertex. The analyzed dataset of proton-proton collisions at ffiffi s p ¼ 13 TeV was collected with the ATLAS detector and corresponds to 136 fb−1. The search employs dedicated reconstruction techniques that significantly increase the sensitivity to long-lived particle decays that occur in the ATLAS inner detector. Background estimates for Standard Model processes and instrumental effects are extracted from data. The observed event yields are compatible with those expected from background processes. The results are presented as limits at 95% confidence level on model-independent cross sections for processes beyond the Standard Model, and interpreted as exclusion limits in scenarios with pair production of long-lived top squarks that decay via a small R-parity-violating coupling into a quark and a muon. Top squarks with masses up to 1.7 TeV are excluded for a lifetime of 0.1 ns, and masses below 1.3 TeV are excluded for lifetimes between 0.01 ns and 30 ns.