  Despite intensive searches at the LHC, no new fundamental particle has been
discovered since the discovery of the 125 GeV Higgs boson. In general, a new
physics discovery is challenging without a UV-complete model because different
channels and observables cannot be combined directly and unambiguously.
Moreover, without indirect hints for new particles, the parameter space to be
searched is huge, resulting in diminished significance due to the
look-elsewhere effect. Several LHC searches with multiple leptons in the final
state point towards the existence of a new Higgs boson with a mass in the
140-160 GeV range, decaying mostly to a pair of W bosons. This dominant decay
mode motivates a Higgs triplet with zero hypercharge, which also predicts a
heavier-than-expected $W$-boson as indicated by the CDF-II measurement. Within
this simple and predictive model, we simulate and combine channels of
associated di-photon production. Considering the run-2 results of ATLAS,
including those presented recently at the Moriond conference, a significance of
4.3$\sigma$ is obtained for a mass of 152 GeV. This is the largest statistical
evidence for a new narrow resonance observed at the LHC.
