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Improving the Combustion Performance of a Hybrid Rocket Engine using a Novel Fuel Grain with a Nested Helical Structure

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Precision jet substructure from boosted event shapes.

Ilya Feige¹, Matthew D Schwartz, Iain W Stewart

¹Center for the Fundamental Laws of Nature, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters

|September 26, 2012

Summary

This summary is machine-generated.

We present a new method for calculating jet substructure at higher orders in Quantum Chromodynamics (QCD). This approach improves accuracy for Large Hadron Collider (LHC) searches by analytically subtracting contamination from initial-state radiation and underlying events.

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Area of Science:

High-energy particle physics
Quantum Chromodynamics (QCD)
Collider physics

Background:

Jet substructure analysis is crucial for searches at the Large Hadron Collider (LHC).
Current studies predominantly use Monte Carlo simulations, which approximate QCD at leading-log level.
A need exists for more precise, higher-order QCD computations for jet substructure.

Purpose of the Study:

To develop and apply a systematic method for higher-order QCD computations of jet substructure.
To calculate the 2-subjettiness distribution for boosted Z→qq[over ¯] events at the LHC.
To demonstrate the analytical subtraction of initial-state radiation (ISR) and underlying event (UE) contamination.

Main Methods:

Boosting global event shapes by a large momentum Q to incorporate higher-order QCD effects.
Treating finite jet size, ISR, and UE effects as 1/Q corrections.
Recycling known results for thrust distribution in e(+)e(-) collisions to simplify calculations.

Main Results:

Computed the 2-subjettiness distribution at next-to-next-to-next-to-leading-log order.
Observed saturation of the 2-subjettiness distribution, becoming independent of Q for Q > 400 GeV.
Successfully demonstrated analytical subtraction of ISR/UE contamination at large Q.

Conclusions:

Higher-order QCD computations for jet substructure are feasible and improve accuracy.
The developed method provides a systematic way to analyze boosted jet substructure at the LHC.
Analytical subtraction of ISR/UE effects offers a robust way to mitigate contamination.