Speaker
Dr
Stephen Gliske
(Argonne National lab, for the STAR Collaboration)
Description
The STAR endcap electromagnetic calorimeter (EEMC) was designed to allow measurement of cross sections and spin observables in the forward direction, $1 < \eta < 2$ and with the full azimuth. Using the EEMC to measure double longitudinal spin asymmetries in photonic channels---such as inclusive neutral pions, prompt photon, and prompt photon + jet---allows access to $\Delta G$ covering a lower $x$ region than current mid-rapidity measurements. Transverse spin asymmetries, shown to be zero at $\eta$ near zero and as large as 10\% at $\eta$ near 4, measured with the EEMC occupy a previously unmeasured region in the 3D pseudorapidity, transverse momentum, and x-Feynman phase space. The neutral pion cross section measurement verifies that the signal of interest can be properly reconstructed and isolated from the background. Particle reconstruction with the STAR EEMC and the status of the spin asymmetries will be discussed, and the preliminary cross section measurement will be presented and compared to NLO pQCD theory.
Author
Dr
Stephen Gliske
(Argonne National lab, for the STAR Collaboration)
