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A strategy for a general search for new phenomena using data-derived signal regions and its application within the ATLAS experiment

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Article number120
<mark>Journal publication date</mark>28/02/2019
<mark>Journal</mark>European Physical Journal D
Issue number2
Number of pages45
Publication StatusPublished
Early online date6/02/19
<mark>Original language</mark>English


This paper describes a strategy for a general search used by the ATLAS Collaboration to find potential indications of new physics. Events are classified according to their final state into many event classes. For each event class an automated search algorithm tests whether the data are compatible with the Monte Carlo simulated expectation in several distributions sensitive to the effects of new physics. The significance of a deviation is quantified using pseudo-experiments. A data selection with a significant deviation defines a signal region for a dedicated follow-up analysis with an improved background expectation. The analysis of the data-derived signal regions on a new dataset allows a statistical interpretation without the large look-elsewhere effect. The sensitivity of the approach is discussed using Standard Model processes and benchmark signals of new physics. As an example, results are shown for 3.2 fb - 1 of proton–proton collision data at a centre-of-mass energy of 13 TeV collected with the ATLAS detector at the LHC in 2015, in which more than 700 event classes and more than 10 5 regions have been analysed. No significant deviations are found and consequently no data-derived signal regions for a follow-up analysis have been defined. © 2019, CERN for the benefit of the ATLAS collaboration.

Bibliographic note

Export Date: 21 February 2019 Funding details: Ministerstwo Nauki i Szkolnictwa Wyższego, MNiSW Funding details: Australian Research Council, ARC Funding details: Fuel Cell Technologies Program, FCT Funding details: Joint Institute for Nuclear Research, JINR Funding details: British Columbia Knowledge Development Fund, BCKDF Funding details: German-Israeli Foundation for Scientific Research and Development, GIF Funding details: TRIUMF Funding details: Ministry of Science and Technology, MOST Funding details: Consejo Nacional de Innovación, Ciencia y Tecnología, CONICYT Funding details: Iowa Science Foundation, ISF Funding details: Ministerstvo Průmyslu a Obchodu, MPO Funding details: American Roentgen Ray Society, ARRS Funding details: School for Advanced Research, SAR Funding details: Japan Society for the Promotion of Science, JSPS Funding details: Campus France Funding details: Türkiye Atom Enerjisi Kurumu, TAEK Funding details: Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science Funding details: European Research Council, ERC Funding details: Labex Funding details: European Cooperation in Science and Technology, COST Funding details: Science and Technology Facilities Council, STFC Funding details: Leverhulme Trust Funding details: Human Growth Foundation, HGF Funding details: Cummings Foundation, CFI Funding details: Thales Group, Thales Funding details: Fundação de Amparo à Pesquisa do Estado de São Paulo, FAPESP Funding details: Narodowym Centrum Nauki, NCN Funding details: Max-Planck-Gesellschaft, MPG Funding details: National Natural Science Foundation of China, NSFC Funding details: Bundesministerium für Bildung und Forschung, BMBF Funding details: Natural Sciences and Engineering Research Council of Canada, NSERC, NRC Funding details: Instituto Nazionale di Fisica Nucleare, INFN Funding details: Horizon 2020 Funding details: Nederlandse Organisatie voor Wetenschappelijk Onderzoek, NWO Funding details: Danmarks Grundforskningsfond, DNRF Funding details: Juvenile Diabetes Research Foundation United States of America, JDRF Funding details: Agence Nationale de la Recherche, ANR Funding details: Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq Funding details: Chinese Academy of Sciences, CAS Funding details: European Geosciences Union, EGU Funding details: European Regional Development Fund, FEDER Funding details: Canarie Funding details: CERN Funding details: Arizona-Nevada Academy of Science, ANAS Funding details: General Secretariat for Research and Technology, GSRT Funding details: H2020 Marie Skłodowska-Curie Actions, MSCA Funding details: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, SNF Funding details: Singapore Eye Research Institute, SERI Funding details: Ministry of Education, Culture, Sports, Science and Technology, MEXT Funding details: Ministry of Education and Science, MES Funding details: Agencia Nacional de Promoción Científica y Tecnológica, ANPCyT Funding details: Ministerio de Economía y Competitividad, MEC Funding details: CRC Health Group, CRC Funding details: Centre National pour la Recherche Scientifique et Technique, CNRST Funding text 1: Acknowledgements 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, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIEN-CIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS, CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF, and MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, CRC and Compute Canada, Canada; COST, ERC, ERDF, Horizon 2020, and Marie Skłodowska-Curie Actions, European Union; Investissements d’ Avenir Labex and Idex, ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and GIF, Israel; CERCA Programme Generalitat de Catalunya, Spain; The Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany),