  We study the lepton-jet correlation in deep inelastic scattering. We perform
one-loop calculations for the spin averaged and transverse spin dependent
differential cross sections depending on the total transverse momentum of the
final state lepton and the jet. The transverse momentum dependent (TMD)
factorization formalism is applied to describe the relevant observables. To
show the physics reach of this process, we perform a phenomenological study for
HERA kinematics and comment on an ongoing analysis of experimental data. In
addition, we highlight the potential of this process to constrain small-$x$
dynamics.
