Threshold effect on transverse momentum dependent distribution function

by Kajal Samanta

Friday 28 Nov 2025, 14:00 → 15:00 Europe/London

Using the joint threshold and transverse momentum dependent (TMD) factorization theorem, we introduce new threshold-TMD distribution functions, including threshold-TMD parton distribution functions (PDFs) and fragmentation functions (FFs). We apply Soft-Collinear Effective Theory and renormalization group methods to carry out QCD evolution for both threshold-TMD PDFs and FFs. We show the universality of threshold TMD functions among three standard processes, i.e. the Drell-Yan production in pp collisions, semi-inclusive deep-inelastic scattering and back-to-back two hadron production in $e^+ e^-$ collisions. In the end, we present the numerical predictions for different threshold-TMD functions and also transverse momentum distributions at $pp$, $ep$, and $e^+e^−$ collisions.