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1.	Adare, A., et al. (author) Transverse momentum dependence of J/psi polarization at midrapidity in p plus p collisions at root s=200 GeV 2010 In: Physical Review D (Particles, Fields, Gravitation and Cosmology). - 1550-2368. ; 82:1 Journal article (peer-reviewed)abstract 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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Type of content: peer-reviewed (1)

Author/Editor: Silvermyr, D. (1); Gustafsson, Hans-Åke (1); Oskarsson, Anders (1); Stenlund, Evert (1); Donadelli, M. (1); Ellinghaus, F. (1); show more...; Hill, J. C. (1); Jia, J. (1); Kim, S. H. (1); Leite, M. A. L. (1); Lenzi, B. (1); Milov, A. (1); Nakamura, T. (1); Vrba, V. (1); Li, X. (1); Ruzicka, P. (1); Grau, N. (1); Liu, H. (1); Fusayasu, T (1); Isobe, T. (1); Lebedev, A. (1); Thomas, T. L. (1); Tomasek, L. (1); Bathe, S. (1); Boyle, K (1); Park, J (1); Kim, D. H. (1); Sukhanov, A. (1); Aphecetche, L. (1); Averbeck, R. (1); Awes, T. C. (1); Baldisseri, A. (1); Baumann, C. (1); Berdnikov, Y. (1); Borel, H. (1); Buesching, H. (1); Charvet, J. L. (1); Chujo, T. (1); del Valle, Z. Conesa (1); Constantin, P. (1); Dubey, A. K. (1); Enokizono, A. (1); Glenn, A. (1); Gunji, T. (1); Hamagaki, H. (1); Horaguchi, T. (1); Inaba, M. (1); Kang, J. H. (1); Khanzadeev, A. (1); Kim, D. J. (1); show less...

University: Lund University (1)

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1)

Year: 2010 (1)

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