@article{fb8e7148e5144cd094f8400918da5a1b,
title = "Measurement of direct photons in Au+Au collisions at √s NN=200GeV",
abstract = "We report the measurement of direct photons at midrapidity in Au+Au collisions at √s NN=200GeV. The direct photon signal was extracted for the transverse momentum range of 4GeV/cT<22GeV/ c, using a statistical method to subtract decay photons from the inclusive photon sample. The direct photon nuclear modification factor R AA was calculated as a function of p T for different Au+Au collision centralities using the measured p+p direct photon spectrum and compared to theoretical predictions. R AA was found to be consistent with unity for all centralities over the entire measured p T range. Theoretical models that account for modifications of initial direct photon production due to modified parton distribution functions in Au and the different isospin composition of the nuclei predict a modest change of R AA from unity. They are consistent with the data. Models with compensating effects of the quark-gluon plasma on high-energy photons, such as suppression of jet-fragmentation photons and induced-photon bremsstrahlung from partons traversing the medium, are also consistent with this measurement.",
author = "S. Afanasiev and C. Aidala and Ajitanand, {N. N.} and Y. Akiba and A. Al-Jamel and J. Alexander and K. Aoki and L. Aphecetche and R. Armendariz and Aronson, {S. H.} and R. Averbeck and Awes, {T. C.} and B. Azmoun and V. Babintsev and A. Baldisseri and Barish, {K. N.} and Barnes, {P. D.} and B. Bassalleck and S. Bathe and Dubey, {Awadhesh Kumar} and Mihael Makek and Alexander Milov and Deepali Sharma and Itzhak Tserruya",
note = "Office of Nuclear Physics in the Office of Science of the Department of Energy; National Science Foundation; Abilene Christian University Research Council; Research Foundation of SUNY; Dean of the College of Arts and Sciences, Vanderbilt University (USA); Ministry of Education, Culture, Sports, Science, and Technology; 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 (P.R. China); Centre National de la Recherche Scientifique, Commissariat a l'Energie Atomique, (France); Institut National de Physique Nucleaire et de Physique des Particules (France); Ministry of Industry, Science and Tekhnologies, (Germany); Bundesministerium fur Bildung und Forschung, (Germany); Deutscher Akademischer Austausch Dienst, (Germany); Alexander von Humboldt Stiftung (Germany); Hungarian National Science Fund, OTKA (Hungary); Department of Atomic Energy (India); Israel Science Foundation (Israel); National Research Foundation (Korea); WCU program of the Ministry Education Science and Technology (Korea); Ministry of Education and Science, (Russia); Russian Academy of Sciences, (Russia); Federal Agency of Atomic Energy (Russia); VR; Wallenberg Foundation (Sweden); U.S. Civilian Research and Development Foundation for the Independent States of the Former Soviet Union; US-Hungarian NSF-OTKA-MTA; US-Israel Binational Science FoundationWe thank the staff of the Collider-Accelerator and Physics Departments at Brookhaven National Laboratory and the staff of the other PHENIX participating institutions for their vital contributions. We acknowledge support from the Office of Nuclear Physics in the Office of Science of the Department of Energy, the National Science Foundation, Abilene Christian University Research Council, Research Foundation of SUNY, and Dean of the College of Arts and Sciences, Vanderbilt University (USA),",
year = "2012",
month = oct,
day = "9",
doi = "https://doi.org/10.1103/PhysRevLett.109.152302",
language = "الإنجليزيّة",
volume = "109",
number = "15",
}