| dc.description.abstract |
<p>A search for new heavy resonances decaying to boson pairs (WZ, WW or ZZ) using
20.3 inverse femtobarns of proton-proton collision data at a center of mass energy
of 8 TeV is presented. The data were recorded by the ATLAS detector at the Large Hadron
Collider (LHC) in 2012. The analysis combines several search channels with the leptonic,
semi-leptonic and fully hadronic final states. The diboson invariant mass spectrum
is studied for local excesses above the Standard Model background prediction, and
no significant excess is observed for the combined analysis. 95$\%$ confidence limits
are set on the cross section times branching ratios for three signal models: an extended
gauge model with a heavy W boson, a bulk Randall-Sundrum model with a spin-2 graviton,
and a simplified model with a heavy vector triplet. Among the individual search channels,
the fully-hadronic channel is predominantly presented where boson tagging technique
and jet substructure cuts are used. Local excesses are found in the dijet mass distribution
around 2 TeV, leading to a global significance of 2.5 standard deviations. This deviation
from the Standard Model prediction results in many theory explanations, and the possibilities
could be further explored using the LHC Run 2 data.</p>
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