2010/05/22 by A. M. Hamed, Hamed, A. M.
Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #nucl-ex
paper · pdf · doi:10.48550/arxiv.1005.4100
4 pages, 6 figures, Lake Louise Winter Institute 2010, 15th-20th February 2010 Alberta, Canada
arxiv created 2010/05/22 · arxiv updated 2010/05/25
The Υ(1S+2S+3S)→ e+e- cross section is measured at mid-rapidity (y) in p+p collisions and in d+Au collisions at center-of-mass energy √(s) = 200 GeV with the STAR detector at RHIC. In p+p, the measured cross section is found to be consistent with the world data trend as a function of √(s), in agreement with the Color Evaportaion Model (CEM), and underestimated by the Color Singlet Model (CSM) up to the Next-to-Leading-Order Quantum Chromodynamics (NLO QCD) calculations. In d+Au, the measured cross section is in agreement with the CEM prediction with anti-shadowing effects, and the nuclear modification factor indicates that Υ(1S+2S+3S) production follows binary scaling within the current uncertainties. These measurements provide a benchmark for the future measurements of Υ production in Au+Au collisions.