TY  - SER
AU  - Aad,G.
AU  - Abdallah,J.
AU  - Chelkov,G.A.
AU  - Vaniachine,A.
AU  - Abbott,B.
TI  - A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector
KW  - ATLAS, детектор
KW  - протон-протонные столкновения
KW  - Большой адронный коллайдер
KW  - W-бозоны
KW  - Z-бозоны
KW  - статьи в журналах
N1  - Библиогр.: 51 назв
N2  - 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
UR  - http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000621838
ER  -