W-jet tagging: Optimizing the identification of boosted hadronically-decaying W bosons

Journal Article · Fri Apr 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.074023· OSTI ID:21537726

Yanou, Cui; Zhenyu, Han; Schwartz, Matthew D ^[1]

---

1. Center for the Fundamental Laws of Nature, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138 (United States)

A method is proposed for distinguishing highly boosted hadronically-decaying W's (W jets) from QCD-jets using jet substructure. Previous methods, such as the filtering/mass-drop method, can give a factor of {approx}2 improvement in S/{radical}(B) for jet p{sub T} > or approx. 200 GeV. In contrast, a multivariate approach including new discriminants such as R cores, which characterize the shape of the W jet, subjet planar flow, and grooming-sensitivities is shown to provide a much larger factor of {approx}5 improvement in S/{radical}(B). For longitudinally polarized W's, such as those coming from many new physics models, the discrimination is even better. Comparing different Monte Carlo simulations, we observe a sensitivity of some variables to the underlying event; however, even with a conservative estimates, the multivariate approach is very powerful. Applications to semileptonic WW resonance searches and all-hadronic W+jet searches at the LHC are also discussed. Code implementing our W-jet tagging algorithm is publicly available at http://jets.physics.harvard.edu/wtag.

• OSTI ID: 21537726
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 7; Other Information: DOI: 10.1103/PhysRevD.83.074023; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGORITHMS
CERN LHC
COMPUTERIZED SIMULATION
GEV RANGE 100-1000
HADRONS
INTERMEDIATE BOSONS
MASS
MONTE CARLO METHOD
MULTIVARIATE ANALYSIS
OPTIMIZATION
QUANTUM CHROMODYNAMICS
RESONANCE
SENSITIVITY
ACCELERATORS
BOSONS
CALCULATION METHODS
CYCLIC ACCELERATORS
ELEMENTARY PARTICLES
ENERGY RANGE
FIELD THEORIES
GEV RANGE
MATHEMATICAL LOGIC
MATHEMATICS
QUANTUM FIELD THEORY
SIMULATION
STATISTICS
STORAGE RINGS
SYNCHROTRONS