Precision Jet Substructure from Boosted Event Shapes

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Precision Jet Substructure from Boosted Event Shapes

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Title: Precision Jet Substructure from Boosted Event Shapes
Author: Feige, Ilya Eric Alexander; Schwartz, Matthew D; Stewart, Iain W.; Thaler, Jesse

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Citation: Feige, Ilya, Matthew D. Schwartz, Iain W. Stewart, and Jesse Thaler. 2012. “Precision Jet Substructure from Boosted Event Shapes.” Physical Review Letters 109 (9) (August). doi:10.1103/physrevlett.109.092001.
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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 q¯ 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 = ∞ and Q = 0 distributions are related by a scaling by e, up to next-to-leading-log order.
Published Version: doi:10.1103/PhysRevLett.109.092001
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