Journal
PHYSICAL REVIEW D
Volume 82, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.82.012001
Keywords
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Funding
- Office of Nuclear Physics in the 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 and 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
- A. von Humboldt Stiftung (Germany)
- Hungarian National Science Fund
- OTKA (Hungary)
- Department of Atomic Energy (India)
- Israel Science Foundation (Israel)
- National Research Foundation (Korea)
- Ministry of Education and Science
- Russia Academy of Sciences, Federal Agency of Atomic Energy (Russia)
- Wallenberg Foundation (Sweden)
- U.S. 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 measurement of the transverse momentum dependence of inclusive J/psi polarization in p + p collisions at root s = 200 GeV performed by the PHENIX Experiment at the Relativistic Heavy Ion Collider. The J/psi polarization is studied in the helicity, Gottfried-Jackson, and Collins-Soper frames for p(T) < 5 GeV/c and vertical bar y vertical bar < 0.35. The polarization in the helicity and Gottfried-Jackson frames is consistent with zero for all transverse momenta, with a slight (1.8 sigma) trend towards longitudinal polarization for transverse momenta above 2 GeV/c. No conclusion is allowed due to the limited acceptance in the Collins-Soper frame and the uncertainties of the current data. The results are compared to observations for other collision systems and center of mass energies and to different quarkonia production models.
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