A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector
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 te...
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| Format: | Article |
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Springer-Verlag
2018
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| Online Access: | http://hdl.handle.net/1721.1/114240 https://orcid.org/0000-0002-7586-7253 |
| _version_ | 1826198633511387136 |
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| author | ATLAS Collaboration Taylor, Frank E |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics ATLAS Collaboration Taylor, Frank E |
| author_sort | ATLAS Collaboration |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T11:07:49Z |
| format | Article |
| id | mit-1721.1/114240 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T11:07:49Z |
| publishDate | 2018 |
| publisher | Springer-Verlag |
| record_format | dspace |
| spelling | mit-1721.1/1142402024-06-27T19:07:58Z A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector ATLAS Collaboration Taylor, Frank E Massachusetts Institute of Technology. Department of Physics Taylor, Frank E 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. 2018-03-20T19:06:25Z 2018-03-20T19:06:25Z 2016-04 2015-09 2018-02-09T19:28:56Z Article http://purl.org/eprint/type/JournalArticle 1434-6044 1434-6052 http://hdl.handle.net/1721.1/114240 Aad, G. et al. “A New Method to Distinguish Hadronically Decaying Boosted Z Bosons from W Bosons Using the ATLAS Detector.” The European Physical Journal C 76, 5 (April 2016) © 2016 CERN for the benefit of the ATLAS collaboration https://orcid.org/0000-0002-7586-7253 http://dx.doi.org/10.1140/epjc/s10052-016-4065-1 European Physical Journal C: Particles and Fields Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf Springer-Verlag Springer |
| spellingShingle | ATLAS Collaboration Taylor, Frank E A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector |
| title | A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector |
| title_full | A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector |
| title_fullStr | A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector |
| title_full_unstemmed | A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector |
| title_short | A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector |
| title_sort | new method to distinguish hadronically decaying boosted z bosons from w bosons using the atlas detector |
| url | http://hdl.handle.net/1721.1/114240 https://orcid.org/0000-0002-7586-7253 |
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