Double Longitudal Spin Asymmetry Measurement and Cross-section for Inclusive Jets at $\sqrt{s}$=200 GeV in polarized p+p collisions

ORAL

Abstract

One of the STAR Spin Collabroation's goals is to determine the proton's polarized gluon distribution for 0.01$<$x$_g<$0.3. The STAR Collaboration takes data at RHIC, which collides polarized protons. A time projection chamber and electromagnetic calorimeter allow pseudorapidity coverage from -1 to +2. A progress report on the 2005 double spin asymmetry measurement will be the focus of this contribution. This measurement has approximately 3 pb$^{-1}$ of data at $\sqrt{s}$=200GeV. Jet transverse momentum coverage is 5$<$pt$<$20 GeV. In 2005 there was increased luminosity, improved jet trigger rates and higher polarization over previous years. Comparisons of A$_{LL}$ to various inclusive jets A$_{LL}$ predictions based on several gluon polarization scenarios will be made. 2003/2004 cross-section and double spin asymmetry measurements will also be presented. These measurements have approximately 1 pb$^{-1}$ of data. Jet transverse momentum for the cross-section measurement is 5$<$pt$<$50 GeV. The cross-section will be compared to NLO pQCD calculations and to simulations.

Authors

  • Julie Millane

    Massachusetts Institute of Technology