Atlas, C;
Aad, G;
Abbott, B;
Abdallah, J;
Abdinov, O;
Aben, R;
Abolins, M;
... Aoki, M; + view all
(2016)
A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector.
European Physical Journal C
, 76
(5)
, Article 238. 10.1140/epjc/s10052-016-4065-1.
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ATLAS 2016 A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector VOR.pdf Download (2MB) | Preview |
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′→ 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.
| Type: | Article |
|---|---|
| Title: | A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1140/epjc/s10052-016-4065-1 |
| Publisher version: | http://dx.doi.org/10.1140/epjc/s10052-016-4065-1 |
| Language: | English |
| Additional information: | Copyright © CERN for the benefit of the ATLAS collaboration 2016. This article is published with open access at Springerlink.com. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0) (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1494032 |
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