Speaker
Description
The determination of the Higgs self-interaction ($\lambda_{HHH}$) constitutes a step forward in the understanding of the EW symmetry breaking mechanism. Higgs self-coupling can be studied in the events where two Higgs bosons (HH) are produced. We propose a new analysis targeting the non-resonant HH production in $WW^*ZZ^*$ decay mode, providing a new contribution to the $HH \rightarrow 4V$ decay channel. The idea is focusing on multilepton ($e, \mu$) and multijet final states, aiming at Run 3 data (2022 and 2023) and combined with the Run 2 data. This decay mode is interesting due to its specific properties, even though it has a small branching ratio of 1.1\%, it is characterized with a good signal to background ratio and clean leptonic modes. We analyze the possible final states in terms of lepton multiplicity, focusing on categories with 3, 4, or 5 leptons. The signal will be extracted by counting events and comparing to expected backgrounds and the limits on $\frac{\sigma}{\sigma_{\text{SM}}}$ will be set as a function of $\kappa_\lambda$.
