Search for heavy charged long -lived particles in proton–proton collisions at s=13TeV using an ionisation measurement with the ATLAS detector

Collaboration, ATLAS and Barton, A.E. and Bertram, I.A. and Borissov, G. and Bouhova -Thacker, E.V. and Fox, H. and Henderson, R.C.W. and Jones, R.W.L. and Kartvelishvili, V. and Long, R.E. and Love, P.A. and Muenstermann, D. and Smizanska, M. and Tee, A.S. and Walder, J. and Wharton, A.M. and Whitmore, B.W. and Ye, S. (2019) Search for heavy charged long -lived particles in proton–proton collisions at s=13TeV using an ionisation measurement with the ATLAS detector. Physics Letters B, 788. pp. 96-116. ISSN 0370-2693

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This Letter presents a search for heavy charged long -lived particles produced in proton–proton collisions at s=13TeV at the LHC using a data sample corresponding to an integrated luminosity of 36.1fb−1 collected by the ATLAS experiment in 2015 and 2016. These particles are expected to travel with a velocity significantly below the speed of light, and therefore have a specific ionisation higher than any high -momentum Standard Model particle of unit charge. The pixel subsystem of the ATLAS detector is used in this search to measure the ionisation energy loss of all reconstructed charged particles which traverse the pixel detector. Results are interpreted assuming the pair production of R -hadrons as composite colourless states of a long -lived gluino and Standard Model partons. No significant deviation from Standard Model background expectations is observed, and lifetime -dependent upper limits on R -hadron production cross -sections and gluino masses are set, assuming the gluino always decays to two quarks and a 100 GeV stable neutralino. R -hadrons with lifetimes above 1.0 ns are excluded at the 95% confidence level, with lower limits on the gluino mass ranging between 1290 GeV and 2060 GeV. In the case of stable R -hadrons, the lower limit on the gluino mass at the 95% confidence level is 1890 GeV. © 2018 The Author

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Journal Article
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Physics Letters B
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Export Date: 23 January 2019 CODEN: PYLBA Funding details: Ontario Innovation Trust, OIT 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: German -Israeli Foundation for Scientific Research and Development, GIF Funding details: British Columbia Knowledge Development Fund, BCKDF Funding details: Israeli Centers for Research Excellence, I -CORE Funding details: TRIUMF Funding details: Ministry of Science and Technology, MOST Funding details: Labex Funding details: Iowa Science Foundation, ISF Funding details: Ministerstvo Průmyslu a Obchodu, MPO Funding details: Alabama Space Grant Consortium, ASGC Funding details: American Roentgen Ray Society, ARRS Funding details: H2020 Marie Skłodowska -Curie Actions, MSCA Funding details: School for Advanced Research, SAR Funding details: Japan Society for the Promotion of Science, JSPS Funding details: Türkiye Atom Enerjisi Kurumu, TAEK Funding details: European Research Council, ERC Funding details: Generalitat Valenciana Funding details: Science and Technology Facilities Council, STFC Funding details: Human Growth Foundation, HGF 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: Generalitat de Catalunya Funding details: Max -Planck -Gesellschaft, MPG Funding details: Bundesministerium für Bildung und Forschung, BMBF Funding details: Leverhulme Trust Funding details: Natural Sciences and Engineering Research Council of Canada, NSERC, NRC Funding details: Brookhaven National Laboratory, BNL Funding details: Instituto Nazionale di Fisica Nucleare, INFN 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: Fonds Québécois de la Recherche sur la Nature et les Technologies, FQRNT Funding details: Marianne and Marcus Wallenberg Foundation Funding details: Chinese Academy of Sciences, CAS Funding details: Departamento Administrativo de Ciencia, Tecnología e Innovación, COLCIENCIAS Funding details: European Geosciences Union, EGU Funding details: CERN Funding details: Poultry Industry Council, PIC Funding details: Bloom's Syndrome Foundation, BSF Funding details: Banting Research Foundation, BRF Funding details: Arizona -Nevada Academy of Science, ANAS Funding details: General Secretariat for Research and Technology, GSRT Funding details: Singapore Eye Research Institute, SERI Funding details: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, SNSF Funding details: Ministry of Education, Culture, Sports, Science and Technology, MEXT Funding details: Ministry of Education and Science, MES Funding details: Compute Canada Funding details: Agencia Nacional de Promoción Científica y Tecnológica, ANPCyT Funding details: Centre National pour la Recherche Scientifique et Technique, CNRST Funding text 1: 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; COLCIENCIAS , 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 , I -CORE 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 , the Canada Council , Canarie , CRC , Compute Canada , FQRNT , and the Ontario Innovation Trust , Canada; EPLANET , ERC , ERDF , FP7 , Horizon 2020 and Marie Skłodowska -Curie Actions , European Union; Investissements d'Avenir Labex and Idex , ANR , Région Auvergne and Fondation Partager le Savoir , France; DFG and AvH Foundation , Germany; Herakleitos, Thales and Aristeia programmes co -financed by EU -ESF and the Greek NSRF ; BSF , GIF and Minerva , Israel; BRF , Norway; CERCA Programme Generalitat de Catalunya , Generalitat Valenciana , 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), INFN -CNAF (Italy), NL -T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA), the Tier -2 facilities worldwide and large non -WLCG resource providers. Major contributors of computing resources are listed in Ref. [62] .
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?? nuclear and high energy physics ??
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28 Jan 2019 17:15
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14 Feb 2024 01:21