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Adding a scalar singlet provides one of the simplest extensions of theStandard Model. In this work we briefly review the latest constraints on themass and mixing of the new Higgs boson and study its production and decay atthe LHC. We mainly focus on double Higgs production in the $hh \rightarrow b\bar{b} WW \rightarrow b \bar{b} \ell^+ \nu \ell^- \bar{\nu}$ decay channel.This decay is found to be efficient in a region of masses of the heavy Higgsboson of 260 - 500 GeV, so it is complementary to the 4$b$ channel, moreefficient for Higgs bosons having masses greater than 500 GeV. We analyse thisdi-leptonic decay channel in detail using kinematic variables such as $M_{\rmT2}$ and the $M_{\rm T2}$-assisted on-shell reconstruction of invisiblemomenta. Using proper cuts, a significance of $\sim$ 3$\sigma$ for 3000fb$^{-1}$ can be achieved at the 14 TeV LHC for $m_H$ = 260 - 400 GeV if themixing is close to its present limit and ${\rm BR}(H \rightarrow hh) \approx1$. Smaller mixing values would require combining various decay channels inorder to reach a similar significance. The complementarity among $ H\rightarrow hh$, $ H \rightarrow ZZ$ and $ H \rightarrow WW$ channels isstudied for arbitrary ${\rm BR}(H \rightarrow hh)$ values.

Resonant Higgs boson pair production in the $hh\rightarrow b\bar{b} \; WW \rightarrow b\bar{b} \ell^+ \nu \ell^- \bar\nu$ decay channel