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We investigate the exclusive jet mass distribution in e+e- events, definedwith a veto on the out-of-jet radiation, at two-loop order. In particular, wecalculate the two-loop soft function, which is required to describe thisdistribution in the threshold region. When combined with other ingredientsusing soft-collinear effective theory, this generates the complete singulardistribution for jet thrust, the sum of the jet masses, at two-loop order. Theresult is in excellent agreement with full QCD. The integrated jet thrustdistribution is found to depend in an intricate way on both the finite jet conesize, R, and the jet veto scale. The result clarifies the structure of thepotentially large logarithms (both global and non- global) which arise in jetobservables for the first time at this order. Somewhat surprisingly, we findthat, in the small R limit, there is a precise and simple correspondencebetween the non-global contribution to the integrated jet thrust distributionand the previously calculated non-global contribution to the integratedhemisphere soft function, including subleading terms. This suggests that thesmall R limit may provide a useful expansion for studying other exclusive jetsubstructure observables.

Jet mass with a jet veto at two loops and the universality of non-global structure