%0 Generic %1 feige2012precision %A Feige, Ilya %A Schwartz, Matthew D. %A Stewart, Iain W. %A Thaler, Jesse %D 2012 %K boosted event jets shapes substructure %R 10.1103/PhysRevLett.109.092001 %T Precision Jet Substructure from Boosted Event Shapes %U http://arxiv.org/abs/1204.3898 %X Jet substructure has emerged as a critical tool for LHC searches, but studies so far have relied heavily on shower Monte Carlo simulations, which formally approximate QCD at leading-log level. We demonstrate that systematic higher-order QCD computations of jet substructure can be carried out by boosting global event shapes by a large momentum Q, and accounting for effects due to finite jet size, initial-state radiation (ISR), and the underlying event (UE) as 1/Q corrections. In particular, we compute the 2-subjettiness substructure distribution for boosted Z -> q qbar events at the LHC at next-to-next-to-next-to-leading-log order. The calculation is greatly simplified by recycling the known results for the thrust distribution in e+ e- collisions. The 2-subjettiness distribution quickly saturates, becoming Q independent for Q > 400 GeV. Crucially, the effects of jet contamination from ISR/UE can be subtracted out analytically at large Q, without knowing their detailed form. Amusingly, the Q=infinity and Q=0 distributions are related by a scaling by e, up to next-to-leading-log order.

@misc{feige2012precision, abstract = {Jet substructure has emerged as a critical tool for LHC searches, but studies so far have relied heavily on shower Monte Carlo simulations, which formally approximate QCD at leading-log level. We demonstrate that systematic higher-order QCD computations of jet substructure can be carried out by boosting global event shapes by a large momentum Q, and accounting for effects due to finite jet size, initial-state radiation (ISR), and the underlying event (UE) as 1/Q corrections. In particular, we compute the 2-subjettiness substructure distribution for boosted Z -> q qbar events at the LHC at next-to-next-to-next-to-leading-log order. The calculation is greatly simplified by recycling the known results for the thrust distribution in e+ e- collisions. The 2-subjettiness distribution quickly saturates, becoming Q independent for Q > 400 GeV. Crucially, the effects of jet contamination from ISR/UE can be subtracted out analytically at large Q, without knowing their detailed form. Amusingly, the Q=infinity and Q=0 distributions are related by a scaling by e, up to next-to-leading-log order.}, added-at = {2013-03-02T15:09:43.000+0100}, author = {Feige, Ilya and Schwartz, Matthew D. and Stewart, Iain W. and Thaler, Jesse}, biburl = {https://www.bibsonomy.org/bibtex/2507eb10b9542a8b1a37cea10fb7500db/wc}, description = {Precision Jet Substructure from Boosted Event Shapes}, doi = {10.1103/PhysRevLett.109.092001}, interhash = {e32a3f55e0fc9c2da2542d1dbac67623}, intrahash = {507eb10b9542a8b1a37cea10fb7500db}, keywords = {boosted event jets shapes substructure}, note = {cite arxiv:1204.3898Comment: 5 pages, 7 figures}, timestamp = {2013-03-02T15:09:43.000+0100}, title = {Precision Jet Substructure from Boosted Event Shapes}, url = {http://arxiv.org/abs/1204.3898}, year = 2012 }