One Higgs is not enough. Studies of the Higgs potential with the ATLAS experiment at the LHC.

The Higgs boson is the last discovered particle of the Standard Model (SM). It crowns the theoretical construction of the SM by providing masses to electroweak bosons through the Brout-Englert-Higgs (BEH) mechanism of spontaneous electroweak symmetry breaking.  The essential feature of this  mechanism is the famous "Mexican hat" potential with non-zero vacuum expectation value.
I will present results of two sets of studies performed by the ATLAS experiment aimed  at measuring of the Higgs  potential and searching for beyond SM deviations to its shape. One set of these measurements  uses Higgs boson interactions with massive electroweak bosons in order to  probe the Higgs potential at its minimum. In order to measure the global shape of the Higgs potential, Higgs bosons self-interactions are studied using  the production of Higgs boson pairs.