W-Jet Tagging: Optimizing the Identification of Boosted Hadronically-Decaying W Bosons

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W-Jet Tagging: Optimizing the Identification of Boosted Hadronically-Decaying W Bosons

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Title: W-Jet Tagging: Optimizing the Identification of Boosted Hadronically-Decaying W Bosons
Author: Cui, Yanou; Han, Zhenyu; Schwartz, Matthew D

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Citation: Cui, Yanou, Zhenyu Han, and Matthew D. Schwartz. 2011. W-jet tagging: optimizing the identification of boosted hadronically-decaying W bosons. Physical Review D 83(7): 074023.
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Abstract: 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 \(\sim 2\) improvement in \(S/\sqrt{B}\) for jet \(p_T \ge 200  GeV\). 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 \(\sim 5\) improvement in \(S/\sqrt{B}\). 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 \(W-je\)t tagging algorithm is publicly available at http://jets.physics.harvard.edu/wtag.
Published Version: 10.1103/PhysRevD.83.074023
Other Sources: http://arxiv.org/abs/1012.2077
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:8063806

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  • FAS Scholarly Articles [7103]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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