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

  • Brian Cox (Contributor)
  • Cinzia Da Via (Contributor)
  • Alessandra Forti (Contributor)
  • Frederick Loebinger (Contributor)
  • Jiri Masik (Contributor)
  • Alexander Oh (Contributor)
  • Joleen Pater (Contributor)
  • Yvonne Peters (Contributor)
  • Andrew Pilkington (Contributor)
  • Darren Price (Contributor)
  • Yang Qin (Contributor)
  • Savanna Shaw (Contributor)
  • Stephen Watts (Contributor)
  • Terence Wyatt (Contributor)
  • The ATLAS Collaboration (Contributor)



    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.
    Date made available4 Jan 2015

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