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Jet substructure has emerged as a critical tool for LHC searches, but studiesso far have relied heavily on shower Monte Carlo simulations, which formallyapproximate QCD at leading-log level. We demonstrate that systematichigher-order QCD computations of jet substructure can be carried out byboosting global event shapes by a large momentum Q, and accounting for effectsdue to finite jet size, initial-state radiation (ISR), and the underlying event(UE) as 1/Q corrections. In particular, we compute the 2-subjettinesssubstructure distribution for boosted Z -> q qbar events at the LHC atnext-to-next-to-next-to-leading-log order. The calculation is greatlysimplified by recycling the known results for the thrust distribution in e+ e-collisions. The 2-subjettiness distribution quickly saturates, becoming Qindependent for Q > 400 GeV. Crucially, the effects of jet contamination fromISR/UE can be subtracted out analytically at large Q, without knowing theirdetailed form. Amusingly, the Q=infinity and Q=0 distributions are related by ascaling by e, up to next-to-leading-log order.

Precision Jet Substructure from Boosted Event Shapes