Journal
PHYSICAL REVIEW D
Volume 90, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.90.111101
Keywords
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Funding
- Department of Energy and National Science Foundation (United States of America)
- Alternative Energies and Atomic Energy Commission and National Center for Scientific Research/ National Institute of Nuclear and Particle Physics (France)
- Ministry of Education and Science of the Russian Federation (Russia)
- National Research Center Kurchatov Institute of the Russian Federation (Russia)
- Russian Foundation for Basic Research (Russia)
- National Council for the Development of Science and Technology
- Carlos Chagas Filho Foundation
- State of Rio de Janeiro (Brazil)
- Department of Atomic Energy and 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 (The Netherlands)
- Science and Technology Facilities Council and The 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 and National Natural Science Foundation of China (China)
- Ministry of Education and Science of Ukraine (Ukraine)
- Science and Technology Facilities Council [PP/D004284/1, ST/K001418/1, ST/H001069/2, ST/M001474/1] Funding Source: researchfish
- STFC [PP/D004284/1, ST/H001069/2] Funding Source: UKRI
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205960, 1306951, 1206092] Funding Source: National Science Foundation
- ICREA Funding Source: Custom
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We present the observation of doubly produced J/psi mesons with the D0 detector at Fermilab in p (p) over bar collisions at root s = 1.96 TeV. The production cross section for both singly and doubly produced J/psi mesons is measured using a sample with an integrated luminosity of 8.1 fb(-1). For the first time, the double J/psi production cross section is separated into contributions due to single and double parton scatterings. Using these measurements, we determine the effective cross section seff, a parameter characterizing an effective spatial area of the parton-parton interactions and related to the parton spatial density inside the nucleon.
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