Speaker
Description
Power-supressed O(qT^2/Q^2) corrections to the Drell-Yan TMD cross-sections and structure functions, which restore QED gauge-invariance of the hadronic tensor in TMD factorization will be discussed in a framework of Parton Reggeization Approach [1,2]. These corrections are important in the region of moderate qT~Q for the description of qT-spectrum and Helicity Structure Functions, and are not taken into account in the standard (Collinear Factorization based) construction of a Y-term. Therefore these corrections could potentially contribute to the resolution of qT-puzzle in Drell-Yan and SDIS.
[1] M.~Nefedov and V.~Saleev,
``Off-shell initial state effects, gauge invariance and angular distributions in the Drell–Yan process,''
Phys. Lett. B 790, 551 (2019)
doi:10.1016/j.physletb.2018.12.071
[arXiv:1810.04061 [hep-ph]].
[2] M.Nefedov and V.Saleev,
``Off-shell initial state effects and gauge invariance in the Drell-Yan process,''
PoS DIS 2019, 193 (2019)
doi:10.22323/1.352.0193
[arXiv:1906.08681 [hep-ph]].
