Open Access. Powered by Scholars. Published by Universities.®

Physics Commons

Open Access. Powered by Scholars. Published by Universities.®

Chemical Physics Publications

Photoproduction

Publication Year

Articles 1 - 2 of 2

Full-Text Articles in Physics

Longitudinal Double-Spin Asymmetry For Inclusive Jet Production In (P)Over-Right-Arrow + (P)Over-Right-Arrow Collisions At Root S=200 Gev, B. I. Abelev, Quan Li, Star Collaboration Jun 2008

Longitudinal Double-Spin Asymmetry For Inclusive Jet Production In (P)Over-Right-Arrow + (P)Over-Right-Arrow Collisions At Root S=200 Gev, B. I. Abelev, Quan Li, Star Collaboration

Chemical Physics Publications

We report a new STAR measurement of the longitudinal double-spin asymmetry A(LL) for inclusive jet production at midrapidity in polarized p+p collisions at a center-of-mass energy of root s = 200 GeV. The data, which cover jet transverse momenta 5 < p(T) < 30 GeV/c, are substantially more precise than previous measurements. They provide significant new constraints on the gluon spin contribution to the nucleon spin through the comparison to predictions derived from one global fit to polarized deep-inelastic scattering measurements. They provide significant new constraints on the gluon spin contribution to the nucleon spin through the comparison to predictions derived from one global fit to polarized deep-inelastic scattering measurements.


Partonic Flow And Phi-Meson Production In Au+Au Collisions At Root S(Nn)=200 Gev, B. I. Abelev, Quan Li, Star Collaboration Sep 2007

Partonic Flow And Phi-Meson Production In Au+Au Collisions At Root S(Nn)=200 Gev, B. I. Abelev, Quan Li, Star Collaboration

Chemical Physics Publications

We present first measurements of the phi-meson elliptic flow (v(2)(p(T))) and high-statistics p(T) distributions for different centralities from root s(NN) = 200 GeV Au+Au collisions at RHIC. In minimum bias collisions the v(2) of the phi meson is consistent with the trend observed for mesons. The ratio of the yields of the Omega to those of the phi as a function of transverse momentum is consistent with a model based on the recombination of thermal s quarks up to p(T)similar to 4 GeV/c, but disagrees at higher momenta. The nuclear modification ...