E-catalog        

Библиогр.: 51 назв.

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.