Abstract
Narrow resonances decaying into WW, WZ or ZZ boson pairs are searched for in 36.7 fb−1 of proton–proton collision data at a centre-of-mass energy of s=13 TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015 and 2016. The diboson system is reconstructed using pairs of large-radius jets with high transverse momentum and tagged as compatible with the hadronic decay of high-momentum W or Z bosons, using jet mass and substructure properties. The search is sensitive to diboson resonances with masses in the range 1.2–5.0 TeV. No significant excess is observed in any signal region. Exclusion limits are set at the 95% confidence level on the production cross section times branching ratio to dibosons for a range of theories beyond the Standard Model. Model-dependent lower limits on the mass of new gauge bosons are set, with the highest limit set at 3.5 TeV in the context of mass-degenerate resonances that couple predominantly to bosons.
Highlights
A major goal of the physics programme at the Large Hadron Collider (LHC) is the search for new phenomena that may become visible in high-energy proton–proton collisions
One possible signature of such new phenomena is the production of a heavy resonance with the subsequent decay into a final state consisting of a pair of vector bosons (W W, W Z, Z Z )
The results presented here benefit from an integrated luminosity of 36.7 fb−1, which is an order of magnitude larger than was a√vailable for the previous search in the fully hadronic final state at s = 13 TeV [17]
Summary
A major goal of the physics programme at the Large Hadron Collider (LHC) is the search for new phenomena that may become visible in high-energy proton–proton (pp) collisions. One possible signature of such new phenomena is the production of a heavy resonance with the subsequent decay into a final state consisting of a pair of vector bosons (W W , W Z , Z Z ). Previous searches for diboson resonances were carried√out by the ATLAS and CMS collaborations with pp collisions at s = 7, 8 and 13 TeV These include fully leptonic ( ν ν, ν ) [13,14,15,16], semileptonic (ννqq, νqq, qq) [17,18,19] and fully hadronic (qqqq) V V [17,19] final states.
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