Measurement of jet-medium interactions via direct photon-hadron correlations in Au+Au and d+Au collisions at √sNN = 200 GeV
PHENIX Collaboration. (2020). Measurement of jet-medium interactions via direct photon-hadron correlations in Au+Au and d+Au collisions at √sNN = 200 GeV. Physical Review C, 102(5), Article 054910. https://doi.org/10.1103/PhysRevC.102.054910
Published inPhysical Review C
© 2020 the Authors
We present direct photon-hadron correlations in 200 GeV/A Au+Au, d+Au, and p+p collisions, for direct photon pT from 5–12 GeV/c, collected by the PHENIX Collaboration in the years from 2006 to 2011. We observe no significant modification of jet fragmentation in d+Au collisions, indicating that cold nuclear matter effects are small or absent. Hadrons carrying a large fraction of the quark's momentum are suppressed in Au+Au compared to p+p and d+Au. As the momentum fraction decreases, the yield of hadrons in Au+Au increases to an excess over the yield in p+p collisions. The excess is at large angles and at low hadron pT and is most pronounced for hadrons associated with lower momentum direct photons. Comparison to theoretical calculations suggests that the hadron excess arises from medium response to energy deposited by jets.
PublisherAmerican Physical Society (APS)
Publication in research information system
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Additional information about fundingWe acknowledge support from the Officeof Nuclear Physics in the Office of Science of the Depart-ment of Energy, the National Science Foundation, AbileneChristian University Research Council, Research Foundationof SUNY, and Dean of the College of Arts and Sciences,Vanderbilt University (USA); Ministry of Education, Cul-ture, Sports, Science, and Technology and the Japan Societyfor the Promotion of Science (Japan); Conselho Nacionalde Desenvolvimento Científico e Tecnológico and Fundaçãode Amparo à Pesquisa do Estado de São Paulo (Brazil);Natural Science Foundation of China (People’s Republic ofChina); Croatian Science Foundation and Ministry of Scienceand Education (Croatia); Ministry of Education, Youth andSports (Czech Republic); Centre National de la RechercheScientifique, Commissariat à l’Énergie Atomique, and InstitutNational de Physique Nucléaire et de Physique des Partic-ules (France); Bundesministerium für Bildung und Forschung,Deutscher Akademischer Austausch Dienst, and Alexan-der von Humboldt Stiftung (Germany); J. Bolyai ResearchScholarship, EFOP, the New National Excellence Program(ÚNKP), NKFIH, and OTKA (Hungary); Department ofAtomic Energy and Department of Science and Technology(India); Israel Science Foundation (Israel) Basic Science Re-search and SRC(CENuM) Programs through NRF funded bythe Ministry of Education and the Ministry of Science and ICT(Korea); Physics Department, Lahore University of Manage-ment Sciences (Pakistan); Ministry of Education and Science,Russian Academy of Sciences, Federal Agency of Atomic En-ergy (Russia); VR and Wallenberg Foundation (Sweden); theUS Civilian Research and Development Foundation for theIndependent States of the Former Soviet Union, the Hungar-ian American Enterprise Scholarship Fund, the US-HungarianFulbright Foundation, and the US-Israel Binational ScienceFoundation. ...
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