The STAR collaboration presents preliminary measurements of AN, the transverse single spin asymmetries in p + p → π0 + X interactions at √s = 200GeV/c with rapidity in the range from 3.3 to 3.7. The data were collected with the STAR FPD and FPD++ detectors during RHIC Run 6. With this much larger data set than that of earlier RHIC runs, a determination of the transverse momentum (pT) dependence of AN for narrow bins of the Feynman XF out to pT > 3GeV/c is presented. While all the current theories predict that the asymmetry at fixed XF should fall with pT, this experimental measurement shows no reduction in asymmetry as a function of pT. These asymmetries correspond to production in a regime where NLO PQCD calculations can successfully describe the spin summed cross sections.
|Original language||English (US)|
|State||Published - Dec 1 2007|
|Event||15th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2007 - Munich, Germany|
Duration: Apr 16 2007 → Apr 20 2007
|Other||15th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2007|
|Period||4/16/07 → 4/20/07|
All Science Journal Classification (ASJC) codes