Search for $W' \rightarrow tb \rightarrow qqbb$ Decays in pp Collisions at $\sqrt{s}$ = 8 TeV with the ATLAS Detector

The ATLAS collaboration
Eur.Phys.J.C 75 (2015) 165, 2015.

Abstract (data abstract)
A search for a massive WPRIME gauge boson is performed with the ATLAS detector at the LHC in P P 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 WPRIME --> TOP BOTTOM --> QUARK QUARK BOTTOM BOTTOM mode for WPRIME masses above 1.5 TeV, where the WPRIME 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 WPRIME 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 WPRIME --> TOP BOTTOM cross section times branching ratio ranging from 0.16 pb to 0.33 pb for left-handed WPRIME bosons, and ranging from 0.10 pb to 0.21 pb for WPRIME bosons with purely right-handed couplings. Upper limits at 95% confidence level are set on the WPRIME-boson coupling to TOP BOTTOM as a function of the WPRIME mass using an effective field theory approach, which is independent of details of particular models predicting a WPRIME boson.

  • Table 1

    Data from Figure 4 a) and b) on page 8 of the preprint


    m_tb distributions in data in the one b-tag and the two b-tag category, together with background-only fits excluding the region...

  • Table 2

    Data from Figure 6 a) and b) on page 9 of the preprint


    Limits at 95% CL on the cross section times branching ratio to TOP BOTTOM for the left-handed and for the...

  • Table 3

    Data from Figure 7 a) and b) on page 9 of the preprint


    Observed and expected 95% CL limits on the ratio of coupling gWPRIME_L/gSM (gWPRIME_R/gSM) of the WPRIME_L (WPRIME_R) model as a...

  • Table 4

    Data from Auxiliary figure from


    Selection acceptance times efficiency as a function of WPRIME mass at truth level for left- and right-handed WPRIME MC. The...

  • Table 5

    Data from Auxiliary table from


    Cutflow (efficiency with respect to total number of events in %) for several WPRIME masses in the left-handed and in...

  • Table 6

    Data from Auxiliary table from


    Overview of the signal acceptance times efficiency (A x Eff) for the hadronic top-quark decay for both categories, the predicted...

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