Search for supersymmetry in events containing a same-flavour opposite-sign dilepton pair, jets, and large missing transverse momentum in √s = 8TeV pp collisions with the ATLAS detector

ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

Two searches for supersymmetric particles in final states containing a same-flavour opposite-sign lepton pair, jets and large missing transverse momentum are presented. The proton–proton collision data used in these searches were collected at a centre-of-mass energy √s =8TeV by the ATLAS detector at the Large Hadron Collider and corresponds to an integrated luminosity of 20.3 fb−1. Two leptonic production mechanisms are considered: decays of squarks and gluinos with Z bosons in the final state, resulting in a peak in the dilepton invariant mass distribution around the Z-boson mass; and decays of neutralinos (e.g.(Formula presented.)), resulting in a kinematic endpoint in the dilepton invariant mass distribution. For the former, an excess of events above the expected Standard Model background is observed, with a significance of three standard deviations. In the latter case, the data are well-described by the expected Standard Model background. The results from each channel are interpreted in the context of several supersymmetric models involving the production of squarks and gluinos.

Original languageEnglish
Article number318
Pages (from-to)1-40
Number of pages40
JournalEuropean Physical Journal C
Volume75
Issue number7
DOIs
StatePublished - 2015

Funding

FundersFunder number
CEA-DSM
Cantons of Bern and Geneva
Czech Republic
DNSRC
IRFU
MES of Russia
MIZŠ
MNE
MSMT
MSSR
MSTD
NSRF
RCN
RGC
VSC CR
Wallenberg Foundation
National Science Foundation
U.S. Department of Energy
Alexander von Humboldt-Stiftung
Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
Türkiye Atom Enerjisi Kurumu
Biomedical Research Foundation
Arizona-Nevada Academy of Science
CERN
Natural Sciences and Engineering Research Council of Canada
National Research Council Canada
Canada Foundation for Innovation
Science and Technology Facilities CouncilST/I005803/1, ST/J004944/1, PP/E000347/1, ST/M004821/1, ST/I006080/1, ST/I000186/1, ST/J004928/1, ST/K001361/1, GRIDPP, ST/G502320/1, ST/M503575/1, ST/M000664/1, ST/J501074/1, ST/L000970/1, ST/L001144/1, ST/K00073X/1, ST/L003325/1, ST/L000326/1, PP/E003087/1, ST/H001093/2, ST/M001431/1, ST/K001418/1, ST/M001474/1, ST/H001093/1, ST/K003658/1, ST/K001388/1, ST/M003213/1, ST/K00137X/1, ST/J005576/1, ST/K50208X/1
Leverhulme Trust
Royal Society
European CommissionIN2P3-CNRS
European Research Council
Australian Research Council
Department of Science and Technology, Ministry of Science and Technology, India
Helmholtz-Gemeinschaft
Minerva Foundation
Deutsche Forschungsgemeinschaft
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung156083
Stichting voor Fundamenteel Onderzoek der Materie
Danmarks Grundforskningsfond
German-Israeli Foundation for Scientific Research and Development
Fundação de Amparo à Pesquisa do Estado de São Paulo
National Natural Science Foundation of China
National Science Council
Fundação para a Ciência e a Tecnologia
Bundesministerium für Bildung und Forschung
Chinese Academy of Sciences
Austrian Science Fund
Comisión Nacional de Investigación Científica y Tecnológica
Agencia Nacional de Promoción Científica y Tecnológica
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministerio de Economía y Competitividad
Bundesministerium für Wissenschaft, Forschung und Wirtschaft
General Secretariat for Research and Technology
Lundbeckfonden
Conselho Nacional de Desenvolvimento Científico e Tecnológico
National Research Foundation of Korea
Joint Institute for Nuclear Research
Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science
Israel Science Foundation
Instituto Nazionale di Fisica Nucleare
Max-Planck-Gesellschaft
Narodowe Centrum Nauki
Javna Agencija za Raziskovalno Dejavnost RS
Ministerstwo Edukacji i Nauki
Ministry of Science and Technology, Taiwan
Georgian National Science Foundation
Israeli Centers for Research Excellence
Centre National pour la Recherche Scientifique et Technique
Council on grants of the President of the Russian Federation
Sociedad Española de Reumatología
National Research Center "Kurchatov Institute"
Institutul de Fizică Atomică

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