TY - JOUR
T1 - A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector
AU - Aad, G
AU - Abbott, B.
AU - Abdallah, J.
AU - Abdinov, O
AU - Aben, R
AU - Abolins, M
AU - Åkesson, Torsten
AU - Bocchetta, Simona
AU - Bryngemark, Lene
AU - Doglioni, Caterina
AU - Floderus, Anders
AU - Hawkins, Anthony
AU - Hedberg, Vincent
AU - Ivarsson, Jenny
AU - Jarlskog, Göran
AU - Lytken, Else
AU - Mjörnmark, Ulf
AU - Smirnova, Oxana
AU - Viazlo, Oleksandr
AU - ATLAS Collaboration
N1 - Cited By :1
Export Date: 23 May 2018
PY - 2016
Y1 - 2016
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′→ 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 tt¯ -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. © 2016, CERN for the benefit of the ATLAS collaboration.
AB - 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 tt¯ -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. © 2016, CERN for the benefit of the ATLAS collaboration.
U2 - 10.1140/epjc/s10052-016-4065-1
DO - 10.1140/epjc/s10052-016-4065-1
M3 - Article
SN - 1434-6044
VL - 76
JO - European Physical Journal C
JF - European Physical Journal C
IS - 5
ER -