Journal
PHYSICAL REVIEW C
Volume 80, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.80.024908
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Funding
- Office of Science of the Department of Energy
- National Science Foundation
- Renaissance Technologies LLC
- 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
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (Brazil)
- Natural Science Foundation of China (People's Republic of China)
- Ministry of Education, Youth and Sports (Czech Republic)
- Centre National de la Recherche Scientifique
- Commissariat a l'Energie Atomique
- Institut National de Physique Nucleaire et de Physique des Particules (France)
- Ministry of Industry, Science and Tekhnologies
- Bundesministerium fur Bildung und Forschung
- Deutscher Akademischer Austausch Dienst
- Alexander von Humboldt Stiftung (Germany)
- Hungarian National Science Fund
- OTKA (Hungary)
- Department of Atomic Energy (India)
- Israel Science Foundation (Israel)
- Korea Research Foundation and Korea Science and Engineering Foundation (Korea)
- Ministry of Education and Science
- Russia Academy of Sciences, Federal Agency of Atomic Energy (Russia)
- Wallenberg Foundation (Sweden)
- US Civilian Research and Development Foundation for the Independent States of the Former Soviet Union
- US-Hungarian Fulbright Foundation for Educational Exchange,
- US-Israel Binational Science Foundation
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We report the observation at the Relativistic Heavy Ion Collider of suppression of back-to-back correlations in the direct photon+jet channel in Au+Au relative to p+p collisions. Two-particle correlations of direct photon triggers with associated hadrons are obtained by statistical subtraction of the decay photon-hadron (gamma-h) background. The initial momentum of the away-side parton is tightly constrained, because the parton-photon pair exactly balance in momentum at leading order in perturbative quantum chromodynamics, making such correlations a powerful probe of the in-medium parton energy loss. The away-side nuclear suppression factor, I-AA, in central Au+Au collisions, is 0.32 +/- 0.12(stat)+/- 0.09(syst) for hadrons of 3 < p(T)(h)< 5 in coincidence with photons of 5 < p(T)(gamma)< 15 GeV/c. The suppression is comparable to that observed for high-p(T) single hadrons and dihadrons. The direct photon associated yields in p+p collisions scale approximately with the momentum balance, z(T)equivalent to p(T)(h)/p(T)(gamma), as expected for a measurement of the away-side parton fragmentation function. We compare to Au+Au collisions for which the momentum balance dependence of the nuclear modification should be sensitive to the path-length dependence of parton energy loss.
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