J/psi production at high transverse momenta in p plus p and Cu plus Cu collisions at [sqrt] s(NN)=200 GeV

• Main Authors: Walker, Matthew H. (Contributor), Sakuma, Tai (Contributor), Redwine, Robert P. (Contributor), Milner, Richard G. (Contributor), Leight, William Axel (Contributor), Kocoloski, Adam Philip (Contributor), Jones, Christopher LaDon (Contributor), Hoffman, A. M. (Contributor), Corliss, Ross Cameron (Contributor), Betancourt, Michael Joseph (Contributor), Surrow, Bernd (Contributor), Balewski, Jan T. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2010-05-19T20:38:58Z.
• Subjects: Article
• Online Access: Get fulltext

The STAR Collaboration at the Relativistic Heavy Ion Collider presents measurements of J/psi-->e+e- at midrapidity and high transverse momentum (pT>5 GeV/c) in p+p and central Cu+Cu collisions at [sqrt]sNN=200 GeV. The inclusive J/psi production cross section for Cu+Cu collisions is found to be consistent at high pT with the binary collision-scaled cross section for p+p collisions. At a confidence level of 97%, this is in contrast to a suppression of J/psi production observed at lower pT. Azimuthal correlations of J/psi with charged hadrons in p+p collisions provide an estimate of the contribution of B-hadron decays to J/psi production of 13%±5%.
RosAtom of Russia
Russian Ministry of Science and Technology
Croatia. Ministarstvo znanosti, obrazovanja i športa
Korean Research Foundation
Polish Ministry of Science and Higher Education
Council of Scientific and Industrial Research of India
DST of the Government of India
DAE of the Government of India
FOM of the Netherlands
NOW of the Netherlands
GA of the Czech Republic
MSMT of the Czech Republic
MoST of China
MoE of China
National Science Council of the Republic of China
Ministry of Education and Science of the Russian Federation
FAPESP of Brazil
EPSRC of the United Kingdom
United States. Dept. of Energy. High Energy Physics Division
United States. Dept. of Energy. Office of Science
Institut National de Physique Nucleaire et Physique des Particules/CNRS
Deutsche Forschungsgemeinschaft (Cluster of Excellence "Origin and Structure of the Universe")