Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at √s = 8 TeV
Abstract
A search for evidence of particle dark matter (DM) and unparticle production at the LHC has been performed using events containing two charged leptons, consistent with the decay of a Z boson, and large missing transverse momentum. This study is based on data collected with the CMS detector corresponding to an integrated luminosity of 19.7 fb^(−1) of pp collisions at the LHC at a center-of-mass energy of 8 TeV. No significant excess of events is observed above the number expected from the standard model contributions. The results are interpreted in terms of 90% confidence level limits on the DM-nucleon scattering cross section, as a function of the DM particle mass, for both spin-dependent and spin-independent scenarios. Limits are set on the effective cutoff scale Λ, and on the annihilation rate for DM particles, assuming that their branching fraction to quarks is 100%. Additionally, the most stringent 95% confidence level limits to date on the unparticle model parameters are obtained.
Additional Information
© 2016 CERN, for the CMS Collaboration. This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Received 30 November 2015; published 22 March 2016. We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centers and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: the Austrian Federal Ministry of Science, Research and Economy and the Austrian Science Fund; the Belgian Fonds de la Recherche Scientifique and Fonds voor Wetenschappelijk Onderzoek; the Brazilian Funding Agencies (CNPq, CAPES, FAPERJ, and FAPESP); the Bulgarian Ministry of Education and Science; CERN; the Chinese Academy of Sciences, Ministry of Science and Technology and National Natural Science Foundation of China; the Colombian Funding Agency (COLCIENCIAS); the Croatian Ministry of Science, Education and Sport and the Croatian Science Foundation; the Research Promotion Foundation, Cyprus; the Ministry of Education and Research, Estonian Research Council via IUT23-4 and IUT23-6 and European Regional Development Fund, Estonia; the Academy of Finland, Finnish Ministry of Education and Culture, and Helsinki Institute of Physics; the Institut National de Physique Nucléaire et de Physique des Particules/CNRS and Commissariat à l'Énergie Atomique et aux Énergies Alternatives/CEA, France; the Bundesministerium für Bildung und Forschung, Deutsche Forschungsgemeinschaft, and Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany; the General Secretariat for Research and Technology, Greece; the National Scientific Research Foundation and National Innovation Office, Hungary; the Department of Atomic Energy and the Department of Science and Technology, India; the Institute for Studies in Theoretical Physics and Mathematics, Iran; the Science Foundation, Ireland; the Istituto Nazionale di Fisica Nucleare, Italy; the Ministry of Science, ICT and Future Planning, and National Research Foundation (NRF), Republic of Korea; the Lithuanian Academy of Sciences; the Ministry of Education and University of Malaya, Malaysia; the Mexican Funding Agencies (CINVESTAV, CONACYT, SEP, and UASLP-FAI); the Ministry of Business, Innovation and Employment, New Zealand; the Pakistan Atomic Energy Commission; the Ministry of Science and Higher Education and the National Science Centre, Poland; the Fundação para a Ciência e a Tecnologia, Portugal; JINR, Dubna, the Ministry of Education and Science of the Russian Federation, the Federal Agency of Atomic Energy of the Russian Federation, Russian Academy of Sciences, and the Russian Foundation for Basic Research; the Ministry of Education, Science and Technological Development of Serbia; the Secretaría de Estado de Investigación, Desarrollo e Innovación and Programa Consolider-Ingenio 2010, Spain; the Swiss Funding Agencies (ETH Board, ETH Zurich, PSI, SNF, UniZH, Canton Zurich, and SER); the Ministry of Science and Technology, Taipei; the Thailand Center of Excellence in Physics, the Institute for the Promotion of Teaching Science and Technology of Thailand, Special Task Force for Activating Research, and the National Science and Technology Development Agency of Thailand; the Scientific and Technical Research Council of Turkey and Turkish Atomic Energy Authority; the National Academy of Sciences of Ukraine and State Fund for Fundamental Researches, Ukraine; the Science and Technology Facilities Council, United Kingdom; the US Department of Energy and the US National Science Foundation. Individuals have received support from the Marie-Curie program and the European Research Council and EPLANET (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research, India; the HOMING PLUS program of the Foundation for Polish Science, cofinanced by the European Union, Regional Development Fund; the OPUS program of the National Science Center (Poland); the Compagnia di San Paolo (Torino); MIUR Project No. 20108T4XTM (Italy); the Thalis and Aristeia programs cofinanced by EU-ESF and the Greek NSRF; the National Priorities Research Program by Qatar National Research Fund; the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand); and the Welch Foundation, Contract No. C-1845.Attached Files
Published - PhysRevD.93.052011.pdf
Submitted - 1511.09375v3.pdf
Files
Name | Size | Download all |
---|---|---|
md5:1adbeaa6970b043e147e489ce394b214
|
941.9 kB | Preview Download |
md5:384d45955f077bb00d8c2cf25175439d
|
1.2 MB | Preview Download |
Additional details
- Eprint ID
- 66657
- Resolver ID
- CaltechAUTHORS:20160504-112512646
- Bundesministerium für Wissenschaft, Forschung und Wirtschaft (BMWFW)
- Fonds de la Recherche Scientifique (FNRS)
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
- Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)
- Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)
- Bulgarian Ministry of Education and Science
- CERN
- Chinese Academy of Sciences
- Ministry of Science and Technology (China)
- National Natural Science Foundation of China
- COLCIENCIAS (Colombia)
- Croatian Ministry of Science, Education and Sport
- Croatian Science Foundation
- Research Promotion Foundation, Cyprus
- Estonian Research Council
- IUT23-4
- Estonian Research Council
- IUT23-6
- European Regional Development Fund, Estonia
- Academy of Finland
- Ministry of Education and Culture (Finland)
- Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
- Commissariat à l'Energie Atomique (CEA)
- Bundesministerium für Bildung und Forschung (BMBF)
- Deutsche Forschungsgemeinschaft (DFG)
- Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF)
- General Secretariat for Research and Technology (GSRT)
- National Scientific Research Foundation (Hungary)
- Department of Atomic Energy (India)
- Institute for Studies in Theoretical Physics and Mathematics, Iran
- Science Foundation, Ireland
- Istituto Nazionale di Fisica Nucleare (INFN)
- Ministry of Science, ICT and Future Planning (Korea)
- Lithuanian Academy of Sciences
- Ministry of Education and University of Malaya, Malaysia
- CINVESTAV (Mexico)
- Consejo Nacional de Ciencia y Tecnologia (CONACyT)
- SEP (Mexico)
- UASLPFAI (Mexico)
- Ministry of Business, Innovation and Employment, New Zealand
- Pakistan Atomic Energy Commission
- Ministry of Science and Higher Education and the National Science Centre, Poland
- Fundação para a Ciência e a Tecnologia (FCT)
- Joint Institute for Nuclear Research (JINR)
- Ministry of Education and Science of the Russian Federation
- Federal Agency of Atomic Energy of the Russian Federation
- Russian Academy of Sciences
- Russian Foundation for Basic Research
- Ministry of Education, Science and Technological Development of Serbia
- Secretaría de Estado de Investigación Desarrollo e Innovación and Programa Consolider Ingenio 2010, Spain
- ETH Board, ETH Zurich, PSI, SNF, UniZH, Canton Zurich, and SER
- Ministry of Science and Technology (Taipei)
- Thailand Center of Excellence in Physics
- Institute for the Promotion of Teaching Science and Technology of Thailand
- Special Task Force for Activating Research and the National Science and Technology Development Agency of Thailand
- Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)
- National Academy of Sciences of Ukraine
- Science and Technology Facilities Council (STFC)
- Department of Energy (DOE)
- NSF
- Marie Curie Fellowship
- Leventis Foundation
- Alfred P. Sloan Foundation
- Alexander von Humboldt Foundation
- Belgian Federal Science Policy Office (BELSPO)
- Fonds pour la Formation à la Recherche dans l'índustrie et dans l'Ágriculture (FRIA-Belgium)
- Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)
- Ministry of Education, Youth and Sports (MEYS) of the Czech Republic
- Council of Science and Industrial Research, India
- HOMING PLUS program of the Foundation for Polish Science
- OPUS program of the National Science Center (Poland)
- Compagnia di San Paolo (Torino)
- Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)
- 20108T4XTM
- Thalis programme
- Qatar National Research Fund
- Rachadapisek Sompot Fund for Postdoctoral Fellowship Chulalongkorn University (Thailand)
- Welch Foundation
- C-1845
- Ministry of Education and Research (Estonia)
- FWF Der Wissenschaftsfonds
- Fonds Wetenschappelijk Onderzoek - Vlaanderen (FWO)
- Helsinki Institute of Physics
- Centre National de la Recherche Scientifique (CNRS)
- National Research Foundation of Korea
- National Innovation Office (Hungary)
- European Research Council (ERC)
- EPLANET
- Department of Science and Technology of India
- Türkiye Atom Enerjisi Kurumu (TAEK)
- State Fund for Fundamental Researches, Ukraine
- Aristeia programme
- European Social Fund
- Greek National Strategic Reference Framework (NSRF)
- Created
-
2016-05-04Created from EPrint's datestamp field
- Updated
-
2021-11-11Created from EPrint's last_modified field