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

Abstract

Adding a scalar singlet provides one of the simplest extensions of the Standard Model. In this work we briefly review the latest constraints on the mass and mixing of the new Higgs boson and study its production and decay at the LHC. We mainly focus on double Higgs production in the hhbbˉWWbbˉ+ννˉhh \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 Higgs boson of 260 - 500 GeV, so it is complementary to the 4bb channel, more efficient for Higgs bosons having masses greater than 500 GeV. We analyse this di-leptonic decay channel in detail using kinematic variables such as MT2M_{\rm T2} and the MT2M_{\rm T2}-assisted on-shell reconstruction of invisible momenta. Using proper cuts, a significance of \sim 3σ\sigma for 3000 fb1^{-1} can be achieved at the 14 TeV LHC for mHm_H = 260 - 400 GeV if the mixing is close to its present limit and BR(Hhh)1{\rm BR}(H \rightarrow hh) \approx 1. Smaller mixing values would require combining various decay channels in order to reach a similar significance. The complementarity among Hhh H \rightarrow hh, HZZ H \rightarrow ZZ and HWW H \rightarrow WW channels is studied for arbitrary BR(Hhh){\rm BR}(H \rightarrow hh) values.Comment: 36 pages, 13 figure

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