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    Rights statement: © CERN for the benefit of the ATLAS collaboration 2015. This article is published with open access at Springerlink.com EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0

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Search for W′→tb→qqbb decays in pp collisions at √ s = 8 TeV with the ATLAS detector

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Article number165
<mark>Journal publication date</mark>04/2015
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number4
Volume75
Number of pages23
Publication StatusPublished
Early online date24/04/15
<mark>Original language</mark>English

Abstract

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 0.16pb to 0.33pb for left-handed W ′ bosons, and ranging from 0.10pb to 0.21pb 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.

Bibliographic note

EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0 © CERN for the benefit of the ATLAS collaboration 2015. This article is published with open access at Springerlink.com