Search for Higgs $\to$ Invisible Decays at the LHC

The recent discovery of the Standard Model (SM) Higgs boson at the LHC experiments (ATLAS and CMS) has finally culminated the long-standing puzzle of electroweak symmetry breaking (at least within the context of the SM), while broadening the scope of beyond the Standard Model (BSM) physics involving the Higgs boson itself. In particular, the characteristic decay of the SM Higgs boson into some particles which can escape detection by the modern High Energy Physics detectors (and thus becomes invisible) can be one of the interesting searches for the BSM physics. In various new physics models, plausible dark matter candidates e.g., Majorana neutrinosMajorana neutrinos , SUSY neutralinosSUSY neutralinos , etc. can couple to the SM Higgs boson and thus can enhance the Higgs $\rightarrow $ invisible yield with respect to the SM predictions. In addition, the measurement of Higgs $\rightarrow $ invisible branching ratio (BR) for the Higgs mass of 125.5 GeV would provide a crucial scrutiny to the tiny SM predictions ( $\approx $ 10$^{-3}$ ). In this article ATLAS and CMS searches for anomalous Higgs $\rightarrow $ invisible decays are summarized.