  New phenomena involving pseudorapidity and azimuthal correlations among final
state particles in $pp$ collisions at the LHC can hint at the existence of
hidden sectors beyond the Standard Model. In this paper we rely on a
correlated-cluster picture of multiparticle production, which was shown to
account for the ridge effect, to assess the effect of a hidden sector on
three-particle correlations concluding that there is a potential signature of
new physics that can be directly tested by experiments using well-known
techniques.
