Journal
PHYSICAL REVIEW C
Volume 98, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.98.054902
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Funding
- Office of Nuclear Physics in the Office of Science of the Department of Energy (U.S.A)
- National Science Foundation (U.S.A)
- Abilene Christian University Research Council (U.S.A)
- Research Foundation of SUNY (U.S.A)
- College of Arts and Sciences, Vanderbilt University (U.S.A)
- Ministry of Education, Culture, Sports, Science and Technology (Japan)
- Japan Society for the Promotion of Science (Japan)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (Brazil)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (Brazil)
- Natural Science Foundation of China (People's Republic of China)
- Croatian Science Foundation (Croatia)
- Ministry of Science and Education (Croatia)
- Ministry of Education, Youth and Sports (Czech Republic)
- Centre National de la Recherche Scientifique (France)
- Commissariat a l'Energie Atomique (France)
- Institut National de Physique Nucleaire et de Physique des Particules (France)
- Bundesministerium fur Bildung und Forschung (Germany)
- Deutscher Akademischer Austausch Dienst (Germany)
- Alexander von Humboldt Stiftung (Germany)
- J. Bolyai Research Scholarship (Hungary)
- EFOP (Hungary)
- New National Excellence Program (UNKP) (Hungary)
- NKFIH (Hungary)
- OTKA (Hungary)
- Department of Atomic Energy (India)
- Department of Science and Technology (India)
- Israel Science Foundation (Israel)
- Basic Science Research Program through NRF - Ministry of Education (Korea)
- SRC(CENuM) Program through NRF - Ministry of Education (Korea)
- Ministry of Science and ICT (Korea)
- Physics Department, Lahore University of Management Sciences (Pakistan)
- Ministry of Education and Science (Russia)
- Russian Academy of Sciences (Russia)
- Federal Agency of Atomic Energy (Russia)
- VR (Sweden)
- Wallenberg Foundation (Sweden)
- U.S. Civilian Research and Development Foundation for the Independent States of the Former Soviet Union
- Hungarian American Enterprise Scholarship Fund
- US-Hungarian Fulbright Foundation
- 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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