A new method to distinguish hadronically decaying boosted ℤ bosons from W bosons using the ATLAS detector

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). A new method to distinguish hadronically decaying boosted ℤ bosons from W bosons using the ATLAS detector. European physical journal. C - particles and fields, 76(5) EDP Sciences 10.1140/epjc/s10052-016-4065-1

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Haug, Sigve; Weber, Michael and Beck, Hans Peter

Subjects:

500 Science > 530 Physics
500 Science > 510 Mathematics

ISSN:

1434-6044

Publisher:

EDP Sciences

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

15 Aug 2017 10:09

Last Modified:

20 Aug 2017 02:17

Publisher DOI:

10.1140/epjc/s10052-016-4065-1

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.100013

URI:

https://boris.unibe.ch/id/eprint/100013

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