4.5 Article

Low-momentum direct-photon measurement in Cu plus Cu collisions at √SNN=200 GeV

Journal

PHYSICAL REVIEW C
Volume 98, Issue 5, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.98.054902

Keywords

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Funding

  1. Office of Nuclear Physics in the Office of Science of the Department of Energy (U.S.A)
  2. National Science Foundation (U.S.A)
  3. Abilene Christian University Research Council (U.S.A)
  4. Research Foundation of SUNY (U.S.A)
  5. College of Arts and Sciences, Vanderbilt University (U.S.A)
  6. Ministry of Education, Culture, Sports, Science and Technology (Japan)
  7. Japan Society for the Promotion of Science (Japan)
  8. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (Brazil)
  9. Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (Brazil)
  10. Natural Science Foundation of China (People's Republic of China)
  11. Croatian Science Foundation (Croatia)
  12. Ministry of Science and Education (Croatia)
  13. Ministry of Education, Youth and Sports (Czech Republic)
  14. Centre National de la Recherche Scientifique (France)
  15. Commissariat a l'Energie Atomique (France)
  16. Institut National de Physique Nucleaire et de Physique des Particules (France)
  17. Bundesministerium fur Bildung und Forschung (Germany)
  18. Deutscher Akademischer Austausch Dienst (Germany)
  19. Alexander von Humboldt Stiftung (Germany)
  20. J. Bolyai Research Scholarship (Hungary)
  21. EFOP (Hungary)
  22. New National Excellence Program (UNKP) (Hungary)
  23. NKFIH (Hungary)
  24. OTKA (Hungary)
  25. Department of Atomic Energy (India)
  26. Department of Science and Technology (India)
  27. Israel Science Foundation (Israel)
  28. Basic Science Research Program through NRF - Ministry of Education (Korea)
  29. SRC(CENuM) Program through NRF - Ministry of Education (Korea)
  30. Ministry of Science and ICT (Korea)
  31. Physics Department, Lahore University of Management Sciences (Pakistan)
  32. Ministry of Education and Science (Russia)
  33. Russian Academy of Sciences (Russia)
  34. Federal Agency of Atomic Energy (Russia)
  35. VR (Sweden)
  36. Wallenberg Foundation (Sweden)
  37. U.S. Civilian Research and Development Foundation for the Independent States of the Former Soviet Union
  38. Hungarian American Enterprise Scholarship Fund
  39. US-Hungarian Fulbright Foundation
  40. US-Israel Binational Science Foundation

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We measured direct photons for p(T) < 5 GeV/c in minimum bias and 0%-40% most-central events at midrapidity for Cu+Cu collisions at root S-NN = 200 GeV. The e(+)e(-) contribution from quasireal direct virtual photons has been determined as an excess over the known hadronic contributions in the e(+)e(-) mass distribution. A clear enhancement of photons over the binary scaled p+p fit is observed for p(T) < 4 GeV/c in Cu+Cu data. The p(T) spectra are consistent with the Au+Au data covering a similar number of participants. The inverse slopes of the exponential fits to the excess after subtraction of the p+p baseline are 285 +/- 53 (stat) +/- 57(syst) MeV/c and 333 +/- 72(stat) +/- 45(syst) MeV/c for minimum bias and 0%-40% most-central events, respectively. The rapidity density, dN / dy, of photons demonstrates the same power law as a function of dN(ch)/d eta observed in Au+Au at the same collision energy.

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