Recombination algorithms and jet substructure: Pruning as a tool for heavy particle searches

Journal Article · Sat May 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.094023· OSTI ID:21409946

Ellis, Stephen D; Vermilion, Christopher K; Walsh, Jonathan R ^[1]

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1. University of Washington, Seattle, Washington 98195-1560 (United States)

We discuss jet substructure in recombination algorithms for QCD jets and single jets from heavy particle decays. We demonstrate that the jet algorithm can introduce significant systematic effects into the substructure. By characterizing these systematic effects and the substructure from QCD, splash-in, and heavy particle decays, we identify a technique, pruning, to better identify heavy particle decays into single jets and distinguish them from QCD jets. Pruning removes protojets typical of soft, wide-angle radiation, improves the mass resolution of jets reconstructing heavy particle decays, and decreases the QCD background to these decays. We show that pruning provides significant improvements over unpruned jets in identifying top quarks and W bosons and separating them from a QCD background, and may be useful in a search for heavy particles.

• OSTI ID: 21409946
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 9; Other Information: DOI: 10.1103/PhysRevD.81.094023; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGORITHMS
MASS RESOLUTION
PARTICLE DECAY
PARTICLES
QUANTUM CHROMODYNAMICS
RECOMBINATION
T QUARKS
W MINUS BOSONS
W PLUS BOSONS
BOSONS
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
MATHEMATICAL LOGIC
POSTULATED PARTICLES
QUANTUM FIELD THEORY
QUARKS
RESOLUTION
TOP PARTICLES