Journal
PHYSICAL REVIEW D
Volume 83, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.83.074023
Keywords
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Funding
- FAS Sciences Division Research Computing Group at Harvard University
- NSF [PHY-0855591, PHY-0804450]
- Harvard Center for Fundamental Laws of Nature
- Department of Energy [DE-SC003916]
- Direct For Mathematical & Physical Scien
- Division Of Physics [804450] Funding Source: National Science Foundation
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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 similar to 2 improvement in S/root B for jet p(T) greater than or similar to 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 similar to 5 improvement in S/root B p. 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.
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