Higgs Hunting 2022

Search for Lorentz boosted nonresonant HH production in the 4b final state with the CMS detector (Zoom)

13 sept. 2022, 16:30

12m

Amphithéâtre Charpak (LPNHE Paris)

Young scientist forum

Orateur

Irene Dutta (California Institute of Technology (US))

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$\to$ 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.

Documents de présentation

HiggsHunting_IreneDutta_130922_final.pdf

Recording