Global Analysis of Worm-Gear TMD g_1T

Transverse momentum dependent parton distributions (TMDs) are an important class of functions required to understand the 3D structure of hadrons in terms of their underlying partons. One of the least known TMDs in terms of a global QCD analysis is the worm-gear TMD g_1T which represents the probablity of finding longitudinally polarized quarks inside transversely polarized hadrons. In this talk, we present the first-ever global QCD analysis of the semi-inclusive DIS A_LT data using Monte Carlo techniques to extract the worm-gear TMD g_1T. The relevant data are available from HERMES, COMPASS and JLab. We compare our results for g_1T  with different theoretical predictions, such as the large-N_c approximation, the Wandzura-Wilczek-type approximation, and lattice QCD.