Orateur
Description
Double Higgs boson production (HH) allows us to measure the Higgs self-interaction and is uniquely sensitive to the structure of the Higgs potential. This talk will cover the production of HH→4b with highly boosted Higgs bosons in the gluon-fusion (ggF) and VBF production mode with 138 fb^{-1} of data collected with the CMS Experiment at sqrt(s) = 13 TeV [1]. The four-bottom-quark final state has the largest branching ratio (33.9%) amongst all HH decays, but is dominated by large backgrounds (QCD and top) and a poor decay channel resolution. To enhance the signal sensitivity, this analysis uses a dedicated jet identification algorithm developed to identify boosted H$\rightarrow$ bb jets, known as the ParticleNet Tagger. This analysis is very sensitive to anomalous quartic VVHH couplings and, for the first time, we exclude $\kappa_{2V}$ = 0 at >5 $sigma$, when other Higgs couplings are at their SM values. This talk will cover the analysis methods used and show the final sensitivity to different HH couplings ($\kappa_{\lambda}$, $\kappa_{2V}$ and $\kappa_{V}$). I'll also discuss future directions and scope of improvements for measuring the HH process.
