Speaker
Description
The full ATLAS Run 2 data set with time-integrated luminosity of 139 fb$^{-1}$ in
the diboson channels in hadronic final states is used to probe a simple model
with an extended gauge sector (EGM), proposed by Altarelli et al., and often taken
as a convenient benchmark by experimentalists. This model predicts new
charged $W'$ and neutral $Z'$ vector bosons with modified
trilinear Standard Model gauge couplings, decaying into
electroweak gauge boson pairs $WZ$ or $WW$, where $W$/$Z$ decay hadronically.
Exclusion limits at the 95\% C.L. on the
$Z'$ and $W'$ resonance production cross section times branching
ratio to electroweak gauge boson pairs in
the mass range of $\sim$ 1 -- 5 TeV are here converted to
constraints on $W$-$W'$ and $Z$-$Z'$ mixing parameters and
masses for the EGM.
We present exclusion regions on the
parameter space of the the $W'$ and $Z'$ by using the full Run 2
data set comprised of $pp$ collisions at $\sqrt{s}=13$ TeV and
recorded by the ATLAS detector at the CERN LHC. The obtained
exclusion regions are significantly extended compared to
those obtained from the previous analysis performed with Tevatron
data as well as with LHC data collected at 7 and 8 TeV in Run~1
and are the most stringent bounds to date.
