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We propose the use of 1-jettiness, a global event shape, for exclusive singlejet production in lepton-nucleus deep inelastic scattering (DIS). We derive afactorization formula, using the Soft-Collinear Effective Theory, differentialin the transverse momentum and rapidity of the jet and the 1-jettiness eventshape. It provides a quantitative measure of the shape of the final-state QCDradiation in the presence of the hard jet, providing a useful powerful probe ofQCD and nuclear physics. For example, one expects differences in the observedpattern of QCD radiation between large and small nuclei and these can bequantified by the 1-jettiness event shape. Numerical results are given for thisnew DIS event shape at leading twist with resummation at thenext-to-next-to-leading logarithmic (NNLL) level of accuracy, for a variety ofnuclear targets. Such studies would be ideal at a future EIC or LHeCelectron-ion collider, where a range of nuclear targets are planned.

The 1-Jettiness event shape for DIS with NNLL resummation