Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.082002
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Funding
- Department of Energy (United States of America)
- National Science Foundation (United States of America)
- Alternative Energies and Atomic Energy Commission
- National Center for Scientific Research/National Institute of Nuclear and Particle Physics (France)
- Ministry of Education and Science of the Russian Federation
- National Research Center Kurchatov Institute of the Russian Federation
- Russian Foundation for Basic Research (Russia)
- National Council for the Development of Science and Technology
- Carlos Chagas Filho Foundation for the Support of Research in the State of Rio de Janeiro (Brazil)
- Department of Atomic Energy
- Department of Science and Technology (India)
- Administrative Department of Science, Technology and Innovation (Colombia)
- National Council of Science and Technology (Mexico)
- National Research Foundation of Korea (Korea)
- Foundation for Fundamental Research on Matter (Netherlands)
- Science and Technology Facilities Council
- Royal Society (United Kingdom)
- Ministry of Education, Youth and Sports (Czech Republic)
- Bundesministerium fur Bildung und Forschung (Federal Ministry of Education and Research)
- Deutsche Forschungsgemeinschaft (German Research Foundation) (Germany)
- Science Foundation Ireland (Ireland)
- Swedish Research Council (Sweden)
- China Academy of Sciences
- National Natural Science Foundation of China (China)
- Ministry of Education and Science of Ukraine (Ukraine)
- ICREA Funding Source: Custom
- Science and Technology Facilities Council [ST/K001418/1, ST/M001474/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [1206092] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1506017, 1508869, 1410972, 1306951] Funding Source: National Science Foundation
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We report evidence for the simultaneous production of J/psi and Upsilon mesons in 8.1 fb(-1) of data collected at root s = 1.96 TeV by the D0 experiment at the Fermilab p (p) over bar Tevatron Collider. Events with these characteristics are expected to be produced predominantly by gluon-gluon interactions. In this analysis, we extract the effective cross section characterizing the initial parton spatial distribution, sigma(eff) = 2.2 +/- 0.7(stat) +/- 0.9(syst) mb.
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