# Search for $W' \rightarrow tb \rightarrow qqbb$ decays in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

Abstract : A search for a massive W′ gauge boson decay-ing to a top quark and a bottom quark is performed with the ATLAS detector in pp collisions at the LHC. The data set 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 asearch 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 predict-ing a W′ boson.
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Journal articles

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1408.0886.pdf
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### Citation

G. Aad, S. Albrand, J. Brown, J. Collot, S. Crépé-Renaudin, et al.. Search for $W' \rightarrow tb \rightarrow qqbb$ decays in $pp$ collisions at $\sqrt{s}$ = 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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