[RBRC seminar] Back-to-back dijet production in DIS: TMD framework up to twist-3 for all Bjorken-$x$

by Dr Fei Yao (BNL)

Thursday 19 Feb 2026, 12:30 → 14:30 US/Eastern

2-160 (https://bnl.zoomgov.com/j/1600983728?pwd=RAD7OLcqre7Ycsp6JfFp6HAnpyLxex.1)

We compute the back-to-back quark–antiquark dijet production cross section in deep inelastic scattering at leading order using the background field formalism, obtaining a TMD-factorized form valid to twist-3 accuracy. Working in back-to-back kinematics, where the transverse momentum imbalance is much smaller than the individual jet momenta, we perform a systematic gradient expansion of quark propagators in the gluon background, organized in terms of longitudinal Wilson lines and field strength tensors. This approach yields results at general Bjorken-$x$, extending beyond the eikonal approximation. We present explicit cross sections for both longitudinally and transversely polarized virtual photons, including leading-twist gluon TMDs and subleading contributions from $F_{+-}$, $F_{ij}$, and three-gluon correlators. In the small-$x$ limit, our expressions reproduce existing Color Glass Condensate results at sub-eikonal accuracy. We further reduce the operator basis using equations of motion, minimizing the number of independent nonperturbative structures.