# Search for resonances decaying to a pair of Higgs bosons in the $\mathrm{b\overline{b}q\overline{q}'}\ell\nu$ final state in proton-proton collisions at $\sqrt{s} =$ 13 TeV

## TL;DR

This paper reports a search for new heavy particles decaying into Higgs boson pairs in proton-proton collisions at 13 TeV, using CMS data, setting limits on possible resonances and interpreting results in extra dimension models.

## Contribution

First search for Higgs pair resonances in the bar{b}qar{q}'
u final state at 13 TeV with advanced jet substructure techniques.

## Key findings

- No significant excess observed over the Standard Model.
- Set exclusion limits on cross section times branching ratio for spin-0 and spin-2 resonances.
- Results are the most sensitive to date for this final state.

## Abstract

A search for new massive particles decaying into a pair of Higgs bosons in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. Data were collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The search is performed for resonances with a mass between 0.8 and 3.5 TeV using events in which one Higgs boson decays into a bottom quark pair and the other decays into two W bosons that subsequently decay into a lepton, a neutrino, and a quark pair. The Higgs boson decays are reconstructed with techniques that identify final state quarks as substructure within boosted jets. The data are consistent with standard model expectations. Exclusion limits are placed on the product of the cross section and branching fraction for generic spin-0 and spin-2 massive resonances. The results are interpreted in the context of radion and bulk graviton production in models with a warped extra spatial dimension. These are the best results to date from searches for an HH resonance decaying to this final state, and they are comparable to the results from searches in other channels for resonances with masses below 1.5 TeV.