On the Journey to High Precisions in High Energy Nuclear Physics
The precision of perturbative QCD calculations has been reached an impressive level to test the standard model in modern hadron colliders. However, high precision computations for processes in heavy ion and polarized hadron collisions are still very limited to determine accurately the fundamental QCD structure of the nucleus and nucleons. In this talk, we first present some of our recent theoretical developments on radiative higher-order corrections to parton multiple scattering in the medium. We demonstrate how QCD factorization holds at next-to-leading order for multiple parton scattering in cold nuclear matter including both dilute (large-x) and dense (small-x) system, and discuss its implication for the medium properties. We then show the application of N-jettiness subtraction scheme in performing higher-order computations for polarized scattering processes. This method allows for a completely differential description of the cross section to match the desired experimental measurements.
HEP Xing Nov03 flyer