Feasibility study for a search for "t\bar{t}HH" production in the "b\bar{b}\gamma\gamma" channel at CMS

The "t\bar{t}HH" production at colliders contains rich information on the nature of the Higgs boson and of its interactions with other particles. This project is an analysis of such process focusing on the final state where one of the Higgs bosons decays to a pair of bottom quarks and the other to a pair of photons, resulting in a clean but rather rare signature. The analysis uses data from proton-proton collisions at a center-of-mass energy of "\sqrt{s} =" 13 TeV recorded between 2016 and 2018 with the CMS detector at the LHC, corresponding to an integrated luminosity of 137.6 "fb^{-1}". The analysis was mainly carried out by means of a cut-based strategy, aimed at the identification of a signal-enriched region of the phase space. A data-driven estimation of the backgrounds is obtained by fitting simultaneously the signal mass window near 125 GeV and the sideband regions of the di-photon invariant mass peak. We also present a preliminary study on the use of machine learning techniques aimed at improving the sensitivity of the analysis.