4.7 Article

Observation and studies of double J/ψ production at the Tevatron

期刊

PHYSICAL REVIEW D
卷 90, 期 11, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.90.111101

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资金

  1. Department of Energy and National Science Foundation (United States of America)
  2. Alternative Energies and Atomic Energy Commission and National Center for Scientific Research/ National Institute of Nuclear and Particle Physics (France)
  3. Ministry of Education and Science of the Russian Federation (Russia)
  4. National Research Center Kurchatov Institute of the Russian Federation (Russia)
  5. Russian Foundation for Basic Research (Russia)
  6. National Council for the Development of Science and Technology
  7. Carlos Chagas Filho Foundation
  8. State of Rio de Janeiro (Brazil)
  9. Department of Atomic Energy and Department of Science and Technology (India)
  10. Administrative Department of Science, Technology and Innovation (Colombia)
  11. National Council of Science and Technology (Mexico)
  12. National Research Foundation of Korea (Korea)
  13. Foundation for Fundamental Research on Matter (The Netherlands)
  14. Science and Technology Facilities Council and The Royal Society (United Kingdom)
  15. Ministry of Education, Youth and Sports (Czech Republic)
  16. Bundesministerium fur Bildung und Forschung (Federal Ministry of Education and Research)
  17. Deutsche Forschungsgemeinschaft (German Research Foundation) (Germany)
  18. Science Foundation Ireland (Ireland)
  19. Swedish Research Council (Sweden)
  20. China Academy of Sciences and National Natural Science Foundation of China (China)
  21. Ministry of Education and Science of Ukraine (Ukraine)
  22. Science and Technology Facilities Council [PP/D004284/1, ST/K001418/1, ST/H001069/2, ST/M001474/1] Funding Source: researchfish
  23. STFC [PP/D004284/1, ST/H001069/2] Funding Source: UKRI
  24. Division Of Physics
  25. Direct For Mathematical & Physical Scien [1205960, 1306951, 1206092] Funding Source: National Science Foundation
  26. 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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