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The LHC discovery of a light Higgs particle $h^0$ (125GeV) opens up newprospect for searching heavier Higgs boson(s) at the LHC Run-2, which willunambiguously point to new physics beyond the standard model (SM). We study thedetection of a heavier neutral Higgs boson $H^0$ via di-Higgs productionchannel at the LHC (14TeV), $H^0 \to h^0h^0 \to WW^*\gamma\gamma$. Thisdirectly probes the $Hhh$ cubic Higgs interaction, which exists in mostextensions of the SM Higgs sector. For the decay products of final states$WW^*$, we include both pure leptonic mode $WW^* \to\ell\bar{\nu}\bar{\ell}\nu$ and semi-leptonic mode $WW^* \to q\bar{q}'\ell\nu$.We analyze signals and backgrounds by performing fast detector simulation forthe full processes $pp \to H \to hh \to WW^*\gamma\gamma \to\ell\bar{\nu}\bar{\ell}\nu\gamma\gamma$ and $pp \to H \to hh \toWW^*\gamma\gamma \to \ell\nu q\bar{q}'\gamma\gamma$, over the mass range$M_H=250-600$GeV. For generic two-Higgs-doublet models (2HDM), we present thediscovery reach of the heavier Higgs boson at the LHC Run-2, and compare itwith the current Higgs global fit of the 2HDM parameter space.

Searching for Heavier Higgs Boson via Di-Higgs Production at LHC Run-2