Abstract
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Austrian Federal Ministry of Science, Research and Economy
Austrian Science Fund
Belgian Fonds de la Recherche Scientifique
Fonds voor Wetenschappelijk Onderzoek
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 São Paulo (FAPESP)
Bulgarian Ministry of Education and Science
CERN
Chinese Academy of Sciences, Ministry of Science and Technology
National Natural Science Foundation of China
Colombian Funding Agency (COLCIENCIAS)
Croatian Ministry of Science, Education and Sport
Croatian Science Foundation
Research Promotion Foundation, Cyprus
Secretariat for Higher Education, Science, Technology and Innovation, Ecuador
Ministry of Education and Research, Estonian Research Council
European Regional Development Fund, Estonia
Academy of Finland
Finnish Ministry of Education and Culture
Helsinki Institute of Physics
Institut National de Physique Nucleaire et de Physique des Particules / CNRS
Commissariat a l'Energie Atomique et aux Energies Alternatives / CEA, France
Bundesministerium fur Bildung and Forschung
Deutsche Forschungsgemeinschaft
Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany
General Secretariat for Research and Technology, Greece
National Scientific Research Foundation
National Innovation Office, Hungary
Department of Atomic Energy
Department of Science and Technology, India
Institute for Studies in Theoretical Physics and Mathematics, Iran
Science Foundation, Ireland
Istituto Nazionale di Fisica Nucleare, Italy
Ministry of Science, ICT and Future Planning
National Research Foundation (NRF), Republic of Korea
Lithuanian Academy of Sciences
Ministry of Education
University of Malaya (Malaysia)
BUAP
CINVESTAV
CONACYT
LNS
SEP
UASLP-FAI
Ministry of Business, Innovation and Employment, New Zealand
Pakistan Atomic Energy Commission
Ministry of Science and Higher Education
National Science Centre, Poland
Fundacao para a Ciencia e a Tecnologia, Portugal
JINR, Dubna
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
Secretaria de Estado de Investigacion, Desarrollo e Innovation and Programa Consolider-Ingenio, Spain
ETH Board
ETH Zurich
PSI
SNF
UniZH
Canton Zurich
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
National Science and Technology Development Agency of Thailand
Scientific and Technical Research Council of Turkey
Turkish Atomic Energy Authority
National Academy of Sciences of Ukraine
State Fund for Fundamental Researches, Ukraine
Science and Technology Facilities Council, UK
US Department of Energy
US National Science Foundation
Marie-Curie program
European Research Council
EPLANET (European Union)
Leventis Foundation
A. P. Sloan Foundation
Alexander von Humboldt Foundation
Belgian Federal Science Policy Office
Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (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
European Union
Mobility Plus program of the Ministry of Science and Higher Education
National Science Center (Poland)
EU-ESF
Greek NSRF
National Priorities Research Program by Qatar National Research Fund
Programa Clarin-COFUND del Principado de Asturias
Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University
Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand)
Welch Foundation
Pair production of gamma(1S) mesons is observed at the LHC in proton-proton collisions at root s = 8 TeV by the CMS experiment in a data sample corresponding to an integrated luminosity of 20.7 fb(-1). Both gamma(1S) candidates are fully reconstructed via their decays to mu(+) mu(-). The fiducial acceptance region is defined by an absolute gamma(1S) rapidity smaller than 2.0. The fiducial cross section for the production of gamma(1S) pairs, assuming that both mesons decay isotropically, is measured to be 68.8 +/- 12.7 (stat) +/- 7.4 (syst) +/- 2.8 (B) pb, where the third uncertainty comes from the uncertainty in the branching fraction of gamma(1S) decays to mu(+) mu(-). Assuming instead that the gamma(1S) mesons are produced with different polarizations leads to variations in the measured cross section in the range from 38% to +36%.
Yerevan Phys Inst, Yerevan, Armenia
Inst Hochenergiephys, Vienna, Austria
Inst Nucl Problems, Minsk, Byelarus
Natl Ctr Particle & High Energy Phys, Minsk, Byelarus
Univ Antwerp, Antwerp, Belgium
Vrije Univ Brussel, Brussels, Belgium
Univ Libre Bruxelles, Brussels, Belgium
Univ Ghent, Ghent, Belgium
Catholic Univ Louvain, Louvain, Belgium
Univ Mons, Mons, Belgium
Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil
Univ Estado Rio de Janeiro, Rio De Janeiro, Brazil
Univ Estadual Paulista, Sao Paulo, Brazil
Univ Fed ABC, Sao Paulo, Brazil
Inst Nucl Energy Res, Sofia, Bulgaria
Univ Sofia, Sofia, Bulgaria
Beihang Univ, Beijing, Peoples R China
Inst High Energy Phys, Beijing, Peoples R China
Peking Univ, State Key Lab Nucl Phys & Technol, Beijing, Peoples R China
Univ Los Andes, Bogota, Colombia
Univ Split, Fac Elect Engn Mech Engn & Naval Architecture, Split, Croatia
Univ Split, Fac Sci, Split, Croatia
Inst Rudjer Boskov, Zagreb, Croatia
Univ Cyprus, Nicosia, Cyprus
Charles Univ Prague, Prague, Czech Republic
Univ San Francisco Quito, Quito, Ecuador
Acad Sci Res & Technol Arab Republ Egypt, Egyptian Network High Energy Phys, Cairo, Egypt
NICPB, Tallinn, Estonia
Univ Helsinki, Dept Phys, Helsinki, Finland
Helsinki Inst Phys, Helsinki, Finland
Lappeenranta Univ Technol, Lappeenranta, Finland
Univ Paris Saclay, CEA, IRFU, Gif Sur Yvette, France
Ecole Polytechn, CNRS, IN2P3, Lab Leprince Ringuet, Palaiseau, France
Univ Strasbourg, CNRS, IN2P3, Inst Pluridisciplinaire Hubert Curien, Univ Haute Alsace Mulhouse, Strasbourg, France
CNRS, Ctr Calcul, IN2P3, Inst Natl Phys Nucl & Phys Particules, Villeurbanne, France
Univ Claude Bernard Lyon 1, CNRS, IN2P3, Inst Phys Nucl Lyon, Villeurbanne, France
Georgian Tech Univ, Tbilisi, Rep of Georgia
Tbilisi State Univ, Tbilisi, Rep of Georgia
Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany
Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany
Rhein Westfal TH Aachen, Phys Inst B 3, Aachen, Germany
Deutsch Elekt Synchrotron, Hamburg, Germany
Univ Hamburg, Hamburg, Germany
Inst Expt Kernphys, Karlsruhe, Germany
NCSR Demokritos, Inst Nucl & Particle Phys INPP, Aghia Paraskevi, Greece
Univ Athens, Athens, Greece
Univ Ioannina, Ioannina, Greece
Eotvos Lorand Univ, MTA ELTE Lendulet CMS Particle & Nucl Phys Grp, Budapest, Hungary
Wigner Res Ctr Phys, Budapest, Hungary
Inst Nucl Res ATOMKI, Debrecen, Hungary
Univ Debrecen, Debrecen, Hungary
Natl Inst Sci Educ & Res, Bhubaneswar, Orissa, India
Panjab Univ, Chandigarh, India
Univ Delhi, Delhi, India
Saha Inst Nucl Phys, Kolkata, India
Indian Inst Technol Madras, Madras, Tamil Nadu, India
Bhabha Atom Res Ctr, Mumbai, Maharashtra, India
Tata Inst Fundamental Res A, Mumbai, Maharashtra, India
Tata Inst Fundamental Res B, Mumbai, Maharashtra, India
Indian Inst Sci Educ & Res IISER, Pune, Maharashtra, India
Inst Res Fundamental Sci IPM, Tehran, Iran
Univ Coll Dublin, Dublin, Ireland
Ist Nazl Fis Nucl, Sez Bari, Bari, Italy
Univ Bari, Bari, Italy
Politecn Bari, Bari, Italy
Ist Nazl Fis Nucl, Sez Bologna, Bologna, Italy
Univ Bologna, Bologna, Italy
Ist Nazl Fis Nucl, Sez Catania, Catania, Italy
Univ Catania, Catania, Italy
Ist Nazl Fis Nucl, Sez Firenze, Florence, Italy
Univ Firenze, Florence, Italy
Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy
Ist Nazl Fis Nucl, Sez Genova, Genoa, Italy
Univ Genoa, Genoa, Italy
Ist Nazl Fis Nucl, Sezi Milano Bicocca, Milan, Italy
Univ Milano Bicocca, Milan, Italy
Ist Nazl Fis Nucl, Sez Napoli, Naples, Italy
Univ Naples Federico II, Naples, Italy
Univ Basilicata, Rome, Italy
Univ G Marconi, Rome, Italy
Ist Nazl Fis Nucl, Sez Padova, Padua, Italy
Univ Padua, Padua, Italy
Univ Trento, Trento, Italy
Ist Nazl Fis Nucl, Sez Pavia, Pavia, Italy
Univ Pavia, Pavia, Italy
Ist Nazl Fis Nucl, Sez Perugia, Perugia, Italy
Univ Perugia, Perugia, Italy
Ist Nazl Fis Nucl, Sez Pisa, Pisa, Italy
Univ Pisa, Pisa, Italy
Scuola Normale Super Pisa, Pisa, Italy
Ist Nazl Fis Nucl, Sez Roma, Rome, Italy
Univ Roma, Rome, Italy
Ist Nazl Fis Nucl, Sez Torino, Turin, Italy
Univ Torino, Turin, Italy
Univ Piemonte Orientale, Novara, Italy
Ist Nazl Fis Nucl, Sez Trieste, Trieste, Italy
Univ Trieste, Trieste, Italy
Kyungpook Natl Univ, Daegu, South Korea
Chonbuk Natl Univ, Jeonju, South Korea
Chonnam Natl Univ, Inst Univ & Elementary Particles, Kwangju, South Korea
Hanyang Univ, Seoul, South Korea
Korea Univ, Seoul, South Korea
Seoul Natl Univ, Seoul, South Korea
Univ Seoul, Seoul, South Korea
Sungkyunkwan Univ, Suwon, South Korea
Vilnius Univ, Vilnius, Lithuania
Univ Malaya, Natl Ctr Particle Phys, Kuala Lumpur, Malaysia
Ctr Invest Estudios Avanzados IPN, Mexico City, DF, Mexico
Univ Iberoamer, Mexico City, DF, Mexico
Benemerita Univ Autonoma Puebla, Puebla, Mexico
Univ Autonoma San Luis Potosi, San Luis Potosi, Mexico
Univ Auckland, Auckland, New Zealand
Univ Canterbury, Christchurch, New Zealand
Quaid I Azam Univ, Natl Ctr Phys, Islamabad, Pakistan
Natl Ctr Nucl Res, Otwock, Poland
Univ Warsaw, Fac Phys, Inst Expt Phys, Warsaw, Poland
Lab Instrument Fis Expt