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Description
The Higgs boson can only decay invisibly to four neutrinos in the SM, which only occurs once in 1000. But in the ATLAS and CMS experiments at the LHC, given the data and performance limitations of each detector, such precision has not been achieved. With BSM models such as the Higgs portal to the dark sector, the coupling of the Higgs boson to DM candidates can be significantly enhanced, leaving an invisible trace in detector events in the form of missing transverse momentum, MET. This is where both Collaborations have performed "MET+X" searches across a variety of Higgs boson production channels, to compute a combined limit across all Run 1 and 2 data. The implication of such constraints, possibly combined with ones from dedicated Dark Matter searches, will be discussed withing the so-called Higgs portal model. Theoretical limitations of this framework will be moreover discussed possibly indicating more realistic benchmark models.
Robert Stephen White is a final year PhD student (thesis submission imminent) at the University of Bristol working on the CMS experiment through the combination of Higgs to invisible decays with Run 1+2 data, and using ML methods in data quality monitoring within the AutoDQM group.
Giorgio Arcadi is assistant (tenure track) professor at the University of Messina. He received his PhD in 2012 from SISSA, and then was postdoc at the University of Goettingen (Germany), LPT Orsay (France), and MPIK Heidelberg (Germany). Furthermore, he was assistant (non tenure track) professor at the University of Rome Tre.
