  After the discovery of a particle that complies with the properties of the
Higgs boson predicted by the Standard Model, particle physics has entered an
exciting era. One important question is whether the scalar sector realized by
Nature indeed corresponds to the one predicted by the SM, or whether the
resonance at 125 GeV is a manifestation of a more extended scalar sector, and
additional scalar states could be observed at current or future collider
facilities.
