报告题目：SIDIS Program at Jefferson Lab--Interactions  between experiment and theory 

报告人：Dr. Tianbo LIU (Jefferson Lab and Duke University)

　　报告时间：2018年12月17日 10:00 – 12:00 

　　报告地点：近代物理所5号楼911会议室 

　　Abstract：Semi-inclusive deep inelastic scattering (SIDIS) is one of the main processes to study transverse momentum dependent parton distributions and nucleon spin structures. Explorations have been made during last two decades. SIDIS experiments in multiple halls at 12 GeV upgraded JLab aim at unprecedented precise measurements of quark three dimensional distributions in the valence region. Global analyses including the projected data indicate the precision of TMD extractions can be improved by about one order of magnitude. A close collaboration between theorists and experimentalists is required to achieve this goal. The full theoretical framework of SIDIS is still far from a satisfactory level. Here we discuss about the power correction, which has significant contributions to low energy SIDIS experiments. Other effects such as high order corrections and threshold resummations may also be important. On the other hand, the analysis tool should be ready for the upcoming data. We develop a global analysis toolkit for TMD extractions based on the nest sampling algorithm to have more realistic estimation of fitting uncertainties. Experimentally, analyzed data are expected to give a faithful representation of nature. A laboratory directed research and development program is approved planning to construct the first universal Monte Carlo event generator using machine learning techniques to minimize theoretical bias during the data analysis. Experiences we will learn from JLab-12 SIDIS program can be applied to future EIC physics programs.