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

Abstract : A search for a massive $W'$ gauge boson is performed with the ATLAS detector at the LHC in pp collisions at a centre-of-mass energy of $\sqrt{s}$ = 8 TeV, corresponding to 20.3 fb$^{-1}$ of integrated luminosity. This analysis is done in the $W' \rightarrow tb \rightarrow qqbb$ mode for $W'$ masses above 1.5 TeV, where the $W'$ decay products are highly boosted. Novel jet substructure techniques are used to identify jets from high-momentum top quarks to ensure high sensitivity, independent of $W'$ mass, up to 3 TeV; b-tagging is also 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 $W' \rightarrow tb$ 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01054309
Contributor : Emmanuelle Vernay <>
Submitted on : Wednesday, August 6, 2014 - 8:22:45 AM
Last modification on : Thursday, November 26, 2020 - 3:39:06 PM

### Citation

G. Aad, S. Albrand, J. Brown, J. Collot, S. Crépé-Renaudin, et al.. Search for W′→tb→qqbb decays in pp collisions at s√ = 8 TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2015, 75 (4), pp.165. ⟨10.1140/epjc/s10052-015-3372-2⟩. ⟨in2p3-01054309⟩

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