363 research outputs found
J/ polarization in p+p collisions at = 200 GeV in STAR
In this paper, J/ polarization at mid-rapidity in collisions at
= 200 GeV measured in the STAR experiment at RHIC is reported.
J/ production is analyzed via the dielectron decay channel. J/
polarization is extracted from the decay angular distribution in the helicity
frame. The J/ polarization is measured at transverse momentum range (2 -
6) GeV/c and is found to be consistent with Color Singlet Model
( CSM), Color Octet Model (COM) predictions and with no polarization
within current uncertainties.Comment: 6 pages, 4 figure, Proceedings of the International Conference on
Strangeness in Quark Matter 2011 (SQM2011), Krakow, Poland, September 18-24,
201
Quarkonia production in the STAR experiment
In this paper, we highlight recent STAR J/ψ and ϒ results. J/ψ nuclear modification factors (RAA) in Au+Au collisions at √sNN = 200, 62.4 and 39 GeV and in U+U collisions at √sNN = 193 GeV, ϒ RAA in d+Au and Au+Au collisions at √sNN = 200 and in U+U collisions at √sNN = 193 GeV are measured and compared to different theoretical calculations. We also report J/ψ elliptic flow (v2) results in Au+Au collisions at √sNN = 200 GeV and the first ψ(2S) to J/ψ ratio measurement in p + p collisions at √s = 500 GeV
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