Comunicazione
Search for Higgs boson pair production via gluon-gluon Fusion and Vector Boson Fusion in the $b\bar{b}\gamma\gamma$ final state from 13 TeV $pp$ collisions data with the ATLAS detector.
Mazzeo E.
A search for di-Higgs boson production in the $b\bar{b}\gamma\gamma$ final state is presented, using data collected by the ATLAS experiment during the second data-taking period (Run 2) of the LHC, amounting to an integrated luminosity of 140 fb$^-1$. Searching for Higgs boson pairs provides an excellent handle for understanding the fundamentals of the Higgs mechanism, and in particular for measuring the trilinear Higgs boson self-coupling $\lambda_{HHH}$, which is still largely unconstrained. In the new $HH\rightarrow b\bar{b}\gamma\gamma$ analysis discussed here the two dominant $HH$ production modes (via gluon-gluon Fusion and Vector Boson Fusion) are probed, thus enhancing the sensitivity to $\lambda_{HHH}$. Moreover, the Vector Boson Fusion production mode constitutes a unique probe to the quartic interaction between two vector bosons and two Higgs bosons (namely, $HHVV$). In case no excess with respect to background expectations is found, upper limits on the di-Higgs production cross-section are placed, and exclusion intervals on the Higgs self-coupling $\lambda_{HHH}$ and the strength of the $HHVV$ interaction are set.