  The energy-energy correlator (EEC) is an event shape observable which probes
the angular correlations of energy depositions in detectors at high energy
collider facilities. It has been investigated extensively in the context of
precision QCD. In this work, we introduce a novel definition of EEC adapted to
the Breit frame in deep-inelastic scattering (DIS). In the back-to-back limit,
the observable we propose is sensitive to the universal transverse momentum
dependent (TMD) parton distribution functions and fragmentation functions, and
it can be studied within the traditional TMD factorization formalism. We
further show that the new observable is insensitive to experimental
pseudorapidity cuts, often imposed in the Laboratory frame due to detector
acceptance limitations. In this work the singular distributions for the new
observable are obtained in soft collinear effective theory up to
$\mathcal{O}(\alpha_s^3)$ and are verified by the full QCD calculations up to
$\mathcal{O}(\alpha_s^2)$. The resummation in the singular limit is performed
up to next-to-next-to-next-to-leading logarithmic accuracy. After incorporating
non-perturbative effects, we present a comparison of our predictions to PYTHIA
8 simulations.
