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A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector G. Aad, B. Abbott, J. Abdallah [et.al.]

Contributor(s): Aad, G | Abdallah, J | Chelkov, G. A | Vaniachine, A | Abbott, BMaterial type: ArticleArticleSubject(s): ATLAS, детектор | протон-протонные столкновения | Большой адронный коллайдер | W-бозоны | Z-бозоныGenre/Form: статьи в журналахOnline resources: Click here to access online In: The European physical journal C Vol. 76, № 5. P. 238 (1-33)Abstract: 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' ightarrow WZ) for bosons in the transverse momentum range 200 GeV (<p_ ext {T}<) 400 GeV in (sqrt{s}=8) TeV pp collisions with the ATLAS detector at the LHC. For Z-boson tagging efficiencies of (epsilon _Z=90) , 50, and (10,%) , one can achieve (W^+) -boson tagging rejection factors ( (1/epsilon _{W^+}) ) 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 (p_ ext {T}) , hadronically decaying Z bosons. However, the modelling of the tagger inputs for boosted W bosons is studied in data using a (tar{t}) -enriched sample of events in 20.3 fb ({}^{-1}) of data at (sqrt{s}=8) TeV. The inputs are well modelled within uncertainties, which builds confidence in the expected tagger performance.
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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'
ightarrow WZ) for bosons in the transverse momentum range 200 GeV (<p_ ext {T}<) 400 GeV in (sqrt{s}=8) TeV pp collisions with the ATLAS detector at the LHC. For Z-boson tagging efficiencies of (epsilon _Z=90) , 50, and (10,%) , one can achieve (W^+) -boson tagging rejection factors ( (1/epsilon _{W^+}) ) 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 (p_ ext {T}) , hadronically decaying Z bosons. However, the modelling of the tagger inputs for boosted W bosons is studied in data using a (tar{t}) -enriched sample of events in 20.3 fb ({}^{-1}) of data at (sqrt{s}=8) TeV. The inputs are well modelled within uncertainties, which builds confidence in the expected tagger performance.

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