Searching for resonant $\textrm{HH}$ production in the $\mathrm{b\overline{b}q\overline{q}'}\ell\nu$ final state at CMS

TL;DR

This paper reports a search for new massive bosons decaying into two Higgs bosons in a specific final state, using CMS data from LHC Run 2, employing advanced reconstruction and fitting techniques to identify potential signals.

Contribution

The study introduces a novel search strategy for resonant HH production in the bbbbqq'lv final state using jet substructure and 2D template fitting at CMS.

Findings

No significant excess observed over background.

Set limits on resonance production cross sections.

Demonstrated effectiveness of jet substructure techniques.

Abstract

New, massive bosons could be found with the LHC. Theories with warped extra dimensions and supersymmetry predict the existence of such resonances, which for some model parameters, have a significant branching fraction to two Higgs bosons. A search for such particles in the $\mathrm{X}\rightarrow\mathrm{HH}\rightarrow\mathrm{b\overline{b}q\overline{q}'}\ell\nu$ channel with the CMS detector is presented. The analysis uses data collected during Run 2 of the LHC at a centre-of-mass energy of 13 TeV. Background is suppressed by reconstructing the full $\mathrm{HH}$ decay chain using jet substructure techniques and the identification of leptons with nearby, boosted jets. A two-dimensional template fit in the plane of resonance the mass and the $\mathrm{H}\rightarrow\mathrm{b\overline{b}}$ mass is used to characterize potential signal with this final state.