Recently, multiparticle-correlation measurements of relativistic p/d/He3+Au, p+Pb, and even p+p collisions show surprising collective signatures. Here, we present beam-energy-scan measurements of two-, four-, and six-particle angular correlations in d+Au collisions at sNN=200, 62.4, 39, and 19.6 GeV. We also present measurements of two- and four-particle angular correlations in p+Au collisions at sNN=200 GeV. We find the four-particle cumulant to be real valued for d+Au collisions at all four energies. We also find that the four-particle cumulant in p+Au has the opposite sign as that in d+Au. Further, we find that the six-particle cumulant agrees with the four-particle cumulant in d+Au collisions at 200 GeV, indicating that nonflow effects are subdominant. These observations provide strong evidence that the correlations originate from the initial geometric configuration, which is then translated into the momentum distribution for all particles, commonly referred to as collectivity.
Bibliographical noteFunding Information:
We 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, the Abilene Christian University Research Council, the Research Foundation of SUNY, and the Dean of the College of Arts and Sciences, Vanderbilt University (U.S.), the Ministry of Education, Culture, Sports, Science, and Technology and the Japan Society for the Promotion of Science (Japan), the Conselho Nacional de Desenvolvimento Científico e Tecnológico and Fundação de Amparo à Pesquisa do Estado de São Paulo (Brazil), the Natural Science Foundation of China (People’s Republic of China), the Croatian Science Foundation and the Ministry of Science and Education (Croatia), the Ministry of Education, Youth and Sports (Czech Republic), the Centre National de la Recherche Scientifique, Commissariat à l’Énergie Atomique, and the Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung, Deutscher Akademischer Austausch Dienst, and Alexander von Humboldt Stiftung (Germany), the National Science Fund, OTKA, EFOP, and the Ch. Simonyi Fund (Hungary), the Department of Atomic Energy and the Department of Science and Technology (India), the Israel Science Foundation (Israel), the Basic Science Research Program through NRF of the Ministry of Education (Korea), the Physics Department, Lahore University of Management Sciences (Pakistan), the Ministry of Education and Science, the Russian Academy of Sciences, the Federal Agency of Atomic Energy (Russia), the VR and Wallenberg Foundation (Sweden), the U.S. Civilian Research and Development Foundation for the Independent States of the Former Soviet Union, the Hungarian American Enterprise Scholarship Fund, and the US-Israel Binational Science Foundation.
© 2018 American Physical Society.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)