Large transverse single spin asymmetries have been measured in high energy protonproton collisions for mesons produced in the very forward region relative to the polarized proton. A summary of these asymmetries, as recently observed by the STAR collaboration at the Brookhaven Relativistic Heavy Ion Collider, will be presented. Using the STAR forward electromagnetic calorimeters, asymmetries for photon pair production in the π 0 and η meson mass regions will be shown and discussed. A surprising result for π 0 mesons includes a non-decreasing transverse momentum dependence for asymmetry at fixed Feynman x. Another surprise is a very large difference in asymmetry for photon pairs from neutral pions as compared to the asymmetry in the η mass region.
|Original language||English (US)|
|State||Published - 2009|
|Event||17th International Workshop on Deep-Inelastic Scattering and Related Topics, DIS 2009 - Madrid, Spain|
Duration: Apr 26 2009 → Apr 30 2009
|Other||17th International Workshop on Deep-Inelastic Scattering and Related Topics, DIS 2009|
|Period||4/26/09 → 4/30/09|
All Science Journal Classification (ASJC) codes