Speaker
Prof.
Ian Balitsky
(JLab/ODU)
Description
The Drell-Yan hadronic tensor is calculated in the Sudakov region $s\gg Q^2\gg q_\perp^2$ with ${1\over Q^2}$ accuracy, first at the tree level and then with the double-log accuracy. It is demonstrated that in the leading order in $N_c$ the higher-twist quark-quark-gluon TMDs reduce to leading-twist TMDs due to QCD equation of motion. The resulting tensor for unpolarized hadrons is EM gauge invariant and depends on two leading-twist TMDs: $f_1$ responsible for total DY cross section, and Boer-Mulders function $h_1^\perp$. The corresponding qualitative and semi-quantitative predictions seem to agree with LHC data for Z-boson production at transverse momentum of DY pair $\sim$ few tens GeV.
Primary author
Prof.
Ian Balitsky
(JLab/ODU)
