Search for W ′ →tb→qqbb Decays in pp Collisions at √s = 8 TeV with the ATLAS Detector

ATLAS, Collaboration; Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Kruker, Tobias; Marti, Lukas; Meloni, Federico; Pretzl, Klaus-Peter; Schneider, Basil; Sciacca, Gianfranco; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Search for W ′ →tb→qqbb Decays in pp Collisions at √s = 8 TeV with the ATLAS Detector. European physical journal. C - particles and fields, 75(4) EDP Sciences 10.1140/epjc/s10052-015-3372-2

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A search for a massive W ′ gauge boson decaying to a top quark and a bottom quark is performed with the ATLAS detector in pp collisions at the LHC. The dataset was taken at a centre-of-mass energy of √s=8 TeV and corresponds to 20.3 fb⁻¹ of integrated luminosity. This analysis is done in the hadronic decay mode of the top quark, where novel jet substructure techniques are used to identify jets from high-momentum top quarks. This allows for a search for high-mass W ′ bosons in the range 1.5−3.0 TeV. b -tagging is used to identify jets originating from b -quarks. The data are consistent with Standard Model background-only expectations, and upper limits at 95% confidence level are set on the W ′ →tb cross section times branching ratio ranging from 0.16 pb to 0.33 pb for left-handed W ′ bosons, and ranging from 0.10 pb to 0.21 pb for W ′ bosons with purely right-handed couplings. Upper limits at 95% confidence level are set on the W ′-boson coupling to tb as a function of the W ′ mass using an effective field theory approach, which is independent of details of particular models predicting a W ′ boson.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kruker, Tobias; Marti, Lukas; Meloni, Federico; Pretzl, Klaus-Peter; Schneider, Basil; Sciacca, Gianfranco; Stramaglia, Maria Elena; Stucci, Stefania and Weber, Michael

Subjects:

500 Science > 530 Physics

ISSN:

1434-6044

Publisher:

EDP Sciences

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

14 Sep 2016 13:33

Last Modified:

12 Feb 2017 02:08

Publisher DOI:

10.1140/epjc/s10052-015-3372-2

ArXiv ID:

arXiv:1408.0886

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.87695

URI:

https://boris.unibe.ch/id/eprint/87695

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