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Study of the hard double-parton scattering contribution to inclusive four-lepton production in pp collisions at root s=8 TeV with the ATLAS detector

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<mark>Journal publication date</mark>10/03/2019
<mark>Journal</mark>Physics Letters B
Number of pages20
Pages (from-to)595-614
Publication StatusPublished
Early online date10/03/19
<mark>Original language</mark>English


The inclusive production of four isolated charged leptons in pp collisions is analysed for the presence of hard double-parton scattering, using 20.2 fb −1 of data recorded in the ATLAS detector at the LHC at centre-of-mass energy s=8 TeV. In the four-lepton invariant-mass range of 80<m 4ℓ<1000 GeV, an artificial neural network is used to enhance the separation between single- and double-parton scattering based on the kinematics of the four leptons in the final state. An upper limit on the fraction of events originating from double-parton scattering is determined at 95% confidence level to be f DPS=0.042, which results in an estimated lower limit on the effective cross section at 95% confidence level of 1.0 mb.

Bibliographic note

Export Date: 28 February 2019 CODEN: PYLBA Funding details: Ministerstwo Nauki i Szkolnictwa Wyższego, MNiSW Funding details: DST / NRF 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: Generalitat de Catalunya Funding details: Ministry of Science and Technology, MOST Funding details: Ministerstvo Průmyslu a Obchodu, MPO Funding details: Iowa Science Foundation, ISF Funding details: Alabama Space Grant Consortium, ASGC 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: Türkiye Atom Enerjisi Kurumu, TAEK Funding details: Campus France 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: 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: Bundesministerium für Bildung und Forschung, BMBF Funding details: Compute Canada 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: 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: 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: Singapore Eye Research Institute, SERI Funding details: Ministry of Education, Culture, Sports, Science and Technology, MEXT Funding details: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, SNF Funding details: Ministry of Education and Science, MES 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 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), 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. [70] .