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The nonbaryonic dark matter of the Universe can consist of new stable chargedspecies, bound in heavy neutral "atoms" by ordinary Coulomb interaction. Stable$\bar U$ (anti-$U$)quarks of 4th generation, bound in stable colorless ($\bar U\bar U \bar U $) clusters, are captured by the primordial helium, produced inBig Bang Nucleosynthesis, thus forming neutral "atoms" of O-helium (OHe), aspecific nuclear interacting dark matter that can provide solution for thepuzzles of direct dark matter searches. However, the existence of the 4thgeneration quarks and leptons should influence the production and decay ratesof Higgs boson and is ruled out by the experimental results of the Higgs bosonsearches at the LHC, if the Higgs boson coupling to 4th generation fermionswith is not suppressed. Here we argue that the difference between the threeknown quark-lepton families and the 4th family can naturally lead tosuppression of this coupling, relating the accelerator test for such acomposite dark matter scenario to the detailed study of the production andmodes of decay of the 125.5 GeV boson, discovered at the LHC.

Probes for 4th generation constituents of dark atoms in Higgs boson studies at the LHC