Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/43757

TitleA new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector
Author(s)Onofre, A.
Castro, Nuno Filipe Silva Fernandes
ATLAS Collaboration
Issue date2016
PublisherSpringer Verlag
JournalThe European Physical Journal C: Particles and Fields
CitationAad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Zwalinski, L.,… Collaboration, A. (2016). A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector. [Article]. European Physical Journal C, 76(5). doi: 10.1140/epjc/s10052-016-4065-1
Abstract(s)The distribution of particles inside hadronic jets produced in the decay of boosted W and Z bosons can be used to discriminate such jets from the continuum background. Given that a jet has been identified as likely resulting from the hadronic decay of a boosted W or Z boson, this paper presents a technique for further differentiating Z bosons from W bosons. The variables used are jet mass, jet charge, and a b-tagging discriminant. A likelihood tagger is constructed from these variables and tested in the simulation of W′→WZ for bosons in the transverse momentum range 200 GeV <pT< 400 GeV in √s=8 TeV pp collisions with the ATLAS detector at the LHC. For Z-boson tagging efficiencies of ϵZ=90, 50, and 10%, one can achieve W+-boson tagging rejection factors (1/ϵW+) of 1.7, 8.3 and 1000, respectively. It is not possible to measure these efficiencies in the data due to the lack of a pure sample of high pT, hadronically decaying Z bosons. However, the modelling of the tagger inputs for boosted W bosons is studied in data using a tˉt-enriched sample of events in 20.3 fb−1 of data at √s=8 TeV. The inputs are well modelled within uncertainties, which builds confidence in the expected tagger performance.
TypeArticle
URIhttp://hdl.handle.net/1822/43757
DOI10.1140/epjc/s10052-016-4065-1
ISSN1434-6044
e-ISSN1434-6052
Peer-Reviewedyes
AccessOpen access
Appears in Collections:LIP - Artigos/papers

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