Simulation and Reconstruction Effort for the E1039 Polarized Drell-Yan Experiment

Among all efforts to solve the proton "spin puzzle", the Sivers function measurement is an important and unique one. Fully understanding the nucleon spin structure requires information on the orbital angular momentum (OAM) of quarks and gluons. Although the search for a rigorous, model-independent connection between the Sivers distribution and quark OAM is still ongoing, it is clear that a non-zero quark Sivers function requires non-zero quark OAM. The upcoming E1039 experiment at FermiLab is an upgrade of the previous E906 (SeaQuest) experiment, now with polarized proton and deuteron targets.  The main goal is to measure the flavor dependent sea quark Sivers function through the Drell-Yan process with its unique sensitive kinematic region. To achieve this physics goal, many hardware and software efforts are underway.  We will report the current status of the E1039 experiment, focusing on improvements to the simulation and reconstruction software.