Speaker
Description
The transverse momentum dependent (TMD) factorization theorem accommodates various types of power corrections. Among them, the least studied are $q_T/Q$ corrections, which become significant at large values of transverse momentum. These corrections partially originate from higher-twist TMD distributions, which exhibit singularity at small transverse distances. We propose a decomposition that reveals this singularity explicitly, and makes the $q_T/Q$ correction manifest. As a concrete application, we consider the next-to-leading power correction for the angular distributions in Drell-Yan, and determine the leading $q_T/Q$ corrections. These corrections are significant for the angular distributions $A_1$ and $A_3$, in complete agreement with the data.