  The first measurement of lepton-jet momentum imbalance and azimuthal
correlation in lepton-proton scattering at high momentum transfer is presented.
These data, taken with the H1 detector at HERA, are corrected for detector
effects using an unbinned machine learning algorithm OmniFold, which considers
eight observables simultaneously in this first application. The unfolded cross
sections are compared to calculations performed within the context of collinear
or transverse-momentum-dependent (TMD) factorization in Quantum Chromodynamics
(QCD) as well as Monte Carlo event generators. The measurement probes a wide
range of QCD phenomena, including TMD parton distribution functions and their
evolution with energy in so far unexplored kinematic regions.
