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We present an analytic $\mathcal O(\alpha_s)$ calculation of cross sectionsin deep inelastic scattering (DIS) dependent on an event shape, 1-jettiness,that probes final states with one jet plus initial state radiation. This is thefirst entirely analytic calculation for a DIS event shape cross section at thisorder. We present results for the differential and cumulative 1-jettiness crosssections, and express both in terms of structure functions dependent not onlyon the usual DIS variables $x$, $Q^2$ but also on the 1-jettiness $\tau$.Combined with previous results for log resummation, predictions are obtainedover the entire range of the 1-jettiness distribution.

Analytic Calculation of 1-Jettiness in DIS at $\mathcal O(\alpha_s)$